extend cell value load to support custom datetime format (#703)

* extend cell value load to support custom datetime format

* cleanup incorrect imports

* fix numeric values conversion as done in legacy Excel

* fix tests coverage

* revert temporary package name fix

* remove personal info from test XLSX files

* remove unused dependencies

* update format conversion in parseTime

* new UT to increase code coverage

* Resolve code review issue for PR #703

* Rename broken file name generated by unit test

Co-authored-by: xuri <xuri.me@gmail.com>

.gitignore

@@ -1,5 +1,6 @@
 ~$*.xlsx
 test/Test*.xlsx
+test/Test*.xlsm
 *.out
 *.test
 .idea

cell.go

@@ -762,9 +762,23 @@ func (f *File) formattedValue(s int, v string) string {
 		return v
 	}
 	styleSheet := f.stylesReader()
-	ok := builtInNumFmtFunc[*styleSheet.CellXfs.Xf[s].NumFmtID]
+	if s >= len(styleSheet.CellXfs.Xf) {
+		return v
+	}
+	numFmtId := *styleSheet.CellXfs.Xf[s].NumFmtID
+	ok := builtInNumFmtFunc[numFmtId]
 	if ok != nil {
-		return ok(*styleSheet.CellXfs.Xf[s].NumFmtID, v)
+		return ok(v, builtInNumFmt[numFmtId])
+	}
+	for _, xlsxFmt := range styleSheet.NumFmts.NumFmt {
+		if xlsxFmt.NumFmtID == numFmtId {
+			format := strings.ToLower(xlsxFmt.FormatCode)
+			if strings.Contains(format, "y") || strings.Contains(format, "m") || strings.Contains(format, "d") || strings.Contains(format, "h") {
+				return parseTime(v, format)
+			}
+
+			return v
+		}
 	}
 	return v
 }

cell_test.go

@@ -111,6 +111,23 @@ func TestSetCellValue(t *testing.T) {
 	assert.EqualError(t, f.SetCellValue("Sheet1", "A", time.Duration(1e13)), `cannot convert cell "A" to coordinates: invalid cell name "A"`)
 }
 
+func TestSetCellValues(t *testing.T) {
+	f := NewFile()
+	err := f.SetCellValue("Sheet1", "A1", time.Date(2010, time.December, 31, 0, 0, 0, 0, time.UTC))
+	assert.NoError(t, err)
+
+	v, err := f.GetCellValue("Sheet1", "A1")
+	assert.NoError(t, err)
+	assert.Equal(t, v, "12/31/10 12:00")
+
+	// test date value lower than min date supported by Excel
+	err = f.SetCellValue("Sheet1", "A1", time.Date(1600, time.December, 31, 0, 0, 0, 0, time.UTC))
+	assert.NoError(t, err)
+
+	_, err = f.GetCellValue("Sheet1", "A1")
+	assert.EqualError(t, err, `strconv.ParseFloat: parsing "1600-12-31T00:00:00Z": invalid syntax`)
+}
+
 func TestSetCellBool(t *testing.T) {
 	f := NewFile()
 	assert.EqualError(t, f.SetCellBool("Sheet1", "A", true), `cannot convert cell "A" to coordinates: invalid cell name "A"`)
@@ -264,3 +281,22 @@ func TestSetCellRichText(t *testing.T) {
 	// Test set cell rich text with illegal cell coordinates
 	assert.EqualError(t, f.SetCellRichText("Sheet1", "A", richTextRun), `cannot convert cell "A" to coordinates: invalid cell name "A"`)
 }
+
+func TestFormattedValue(t *testing.T) {
+	f := NewFile()
+	v := f.formattedValue(0, "43528")
+	assert.Equal(t, "43528", v)
+
+	v = f.formattedValue(15, "43528")
+	assert.Equal(t, "43528", v)
+
+	v = f.formattedValue(1, "43528")
+	assert.Equal(t, "43528", v)
+	customNumFmt := "[$-409]MM/DD/YYYY"
+	_, err := f.NewStyle(&Style{
+		CustomNumFmt: &customNumFmt,
+	})
+	assert.NoError(t, err)
+	v = f.formattedValue(1, "43528")
+	assert.Equal(t, "03/04/2019", v)
+}

crypt_test.go

@@ -19,5 +19,5 @@ import (
 func TestEncrypt(t *testing.T) {
 	f, err := OpenFile(filepath.Join("test", "encryptSHA1.xlsx"), Options{Password: "password"})
 	assert.NoError(t, err)
-	assert.EqualError(t, f.SaveAs(filepath.Join("test", "TestEncrypt.xlsx"), Options{Password: "password"}), "not support encryption currently")
+	assert.EqualError(t, f.SaveAs(filepath.Join("test", "BadEncrypt.xlsx"), Options{Password: "password"}), "not support encryption currently")
 }

excelize.go

@@ -158,7 +158,7 @@ func (f *File) setDefaultTimeStyle(sheet, axis string, format int) error {
 	}
 	if s == 0 {
 		style, _ := f.NewStyle(&Style{NumFmt: format})
-		_ = f.SetCellStyle(sheet, axis, axis, style)
+		err = f.SetCellStyle(sheet, axis, axis, style)
 	}
 	return err
 }

excelize_test.go

@@ -257,7 +257,7 @@ func TestBrokenFile(t *testing.T) {
 
 	t.Run("SaveAsEmptyStruct", func(t *testing.T) {
 		// Test write file with broken file struct with given path.
-		assert.NoError(t, f.SaveAs(filepath.Join("test", "BrokenFile.SaveAsEmptyStruct.xlsx")))
+		assert.NoError(t, f.SaveAs(filepath.Join("test", "BadWorkbook.SaveAsEmptyStruct.xlsx")))
 	})
 
 	t.Run("OpenBadWorkbook", func(t *testing.T) {
@@ -1175,6 +1175,9 @@ func TestSetDefaultTimeStyle(t *testing.T) {
 	f := NewFile()
 	// Test set default time style on not exists worksheet.
 	assert.EqualError(t, f.setDefaultTimeStyle("SheetN", "", 0), "sheet SheetN is not exist")
+
+	// Test set default time style on invalid cell
+	assert.EqualError(t, f.setDefaultTimeStyle("Sheet1", "", 42), "cannot convert cell \"\" to coordinates: invalid cell name \"\"")
 }
 
 func TestAddVBAProject(t *testing.T) {

file.go

@@ -123,7 +123,7 @@ func (f *File) WriteToBuffer() (*bytes.Buffer, error) {
 		}
 	}
 
-	if f.options != nil {
+	if f.options != nil && f.options.Password != "" {
 		if err := zw.Close(); err != nil {
 			return buf, err
 		}

rows.go

@@ -345,6 +345,25 @@ func (xlsx *xlsxC) getValueFrom(f *File, d *xlsxSST) (string, error) {
 		}
 		return f.formattedValue(xlsx.S, xlsx.V), nil
 	default:
+		// correct numeric values as legacy Excel app
+		// https://en.wikipedia.org/wiki/Numeric_precision_in_Microsoft_Excel
+		// In the top figure the fraction 1/9000 in Excel is displayed.
+		// Although this number has a decimal representation that is an infinite string of ones,
+		// Excel displays only the leading 15 figures. In the second line, the number one is added to the fraction, and again Excel displays only 15 figures.
+		const precision = 1000000000000000
+		if len(xlsx.V) > 16 {
+			num, err := strconv.ParseFloat(xlsx.V, 64)
+			if err != nil {
+				return "", err
+			}
+
+			num = math.Round(num*precision) / precision
+			val := fmt.Sprintf("%g", num)
+			if val != xlsx.V {
+				return f.formattedValue(xlsx.S, val), nil
+			}
+		}
+
 		return f.formattedValue(xlsx.S, xlsx.V), nil
 	}
 }

rows_test.go

@@ -817,7 +817,7 @@ func TestDuplicateMergeCells(t *testing.T) {
 	assert.EqualError(t, f.duplicateMergeCells("SheetN", xlsx, 1, 2), "sheet SheetN is not exist")
 }
 
-func TestGetValueFrom(t *testing.T) {
+func TestGetValueFromInlineStr(t *testing.T) {
 	c := &xlsxC{T: "inlineStr"}
 	f := NewFile()
 	d := &xlsxSST{}
@@ -826,6 +826,20 @@ func TestGetValueFrom(t *testing.T) {
 	assert.Equal(t, "", val)
 }
 
+func TestGetValueFromNumber(t *testing.T) {
+	c := &xlsxC{T: "n", V: "2.2200000000000002"}
+	f := NewFile()
+	d := &xlsxSST{}
+	val, err := c.getValueFrom(f, d)
+	assert.NoError(t, err)
+	assert.Equal(t, "2.22", val)
+
+	c = &xlsxC{T: "n", V: "2.220000ddsf0000000002-r"}
+	val, err = c.getValueFrom(f, d)
+	assert.NotNil(t, err)
+	assert.Equal(t, "strconv.ParseFloat: parsing \"2.220000ddsf0000000002-r\": invalid syntax", err.Error())
+}
+
 func TestErrSheetNotExistError(t *testing.T) {
 	err := ErrSheetNotExist{SheetName: "Sheet1"}
 	assert.EqualValues(t, err.Error(), "sheet Sheet1 is not exist")
@@ -842,6 +856,27 @@ func TestCheckRow(t *testing.T) {
 	assert.EqualError(t, f.SetCellValue("Sheet1", "A1", false), `cannot convert cell "-" to coordinates: invalid cell name "-"`)
 }
 
+func TestNumberFormats(t *testing.T) {
+	f, err := OpenFile(filepath.Join("test", "Book1.xlsx"))
+	if !assert.NoError(t, err) {
+		t.FailNow()
+	}
+	cells := make([][]string, 0)
+	cols, err := f.Cols("Sheet2")
+	if !assert.NoError(t, err) {
+		t.FailNow()
+	}
+	for cols.Next() {
+		col, err := cols.Rows()
+		assert.NoError(t, err)
+		if err != nil {
+			break
+		}
+		cells = append(cells, col)
+	}
+	assert.Equal(t, []string{"", "200", "450", "200", "510", "315", "127", "89", "348", "53", "37"}, cells[3])
+}
+
 func BenchmarkRows(b *testing.B) {
 	f, _ := OpenFile(filepath.Join("test", "Book1.xlsx"))
 	for i := 0; i < b.N; i++ {

sheet_test.go

@@ -1,4 +1,4 @@
-package excelize_test
+package excelize
 
 import (
 	"fmt"
@@ -6,26 +6,24 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/360EntSecGroup-Skylar/excelize/v2"
-
 	"github.com/mohae/deepcopy"
 	"github.com/stretchr/testify/assert"
 )
 
 func ExampleFile_SetPageLayout() {
-	f := excelize.NewFile()
+	f := NewFile()
 
 	if err := f.SetPageLayout(
 		"Sheet1",
-		excelize.PageLayoutOrientation(excelize.OrientationLandscape),
+		PageLayoutOrientation(OrientationLandscape),
 	); err != nil {
 		fmt.Println(err)
 	}
 	if err := f.SetPageLayout(
 		"Sheet1",
-		excelize.PageLayoutPaperSize(10),
-		excelize.FitToHeight(2),
-		excelize.FitToWidth(2),
+		PageLayoutPaperSize(10),
+		FitToHeight(2),
+		FitToWidth(2),
 	); err != nil {
 		fmt.Println(err)
 	}
@@ -33,12 +31,12 @@ func ExampleFile_SetPageLayout() {
 }
 
 func ExampleFile_GetPageLayout() {
-	f := excelize.NewFile()
+	f := NewFile()
 	var (
-		orientation excelize.PageLayoutOrientation
-		paperSize   excelize.PageLayoutPaperSize
-		fitToHeight excelize.FitToHeight
-		fitToWidth  excelize.FitToWidth
+		orientation PageLayoutOrientation
+		paperSize   PageLayoutPaperSize
+		fitToHeight FitToHeight
+		fitToWidth  FitToWidth
 	)
 	if err := f.GetPageLayout("Sheet1", &orientation); err != nil {
 		fmt.Println(err)
@@ -67,7 +65,7 @@ func ExampleFile_GetPageLayout() {
 }
 
 func TestNewSheet(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	sheetID := f.NewSheet("Sheet2")
 	f.SetActiveSheet(sheetID)
 	// delete original sheet
@@ -76,7 +74,7 @@ func TestNewSheet(t *testing.T) {
 }
 
 func TestSetPane(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	assert.NoError(t, f.SetPanes("Sheet1", `{"freeze":false,"split":false}`))
 	f.NewSheet("Panes 2")
 	assert.NoError(t, f.SetPanes("Panes 2", `{"freeze":true,"split":false,"x_split":1,"y_split":0,"top_left_cell":"B1","active_pane":"topRight","panes":[{"sqref":"K16","active_cell":"K16","pane":"topRight"}]}`))
@@ -93,13 +91,13 @@ func TestPageLayoutOption(t *testing.T) {
 	const sheet = "Sheet1"
 
 	testData := []struct {
-		container  excelize.PageLayoutOptionPtr
-		nonDefault excelize.PageLayoutOption
+		container  PageLayoutOptionPtr
+		nonDefault PageLayoutOption
 	}{
-		{new(excelize.PageLayoutOrientation), excelize.PageLayoutOrientation(excelize.OrientationLandscape)},
-		{new(excelize.PageLayoutPaperSize), excelize.PageLayoutPaperSize(10)},
-		{new(excelize.FitToHeight), excelize.FitToHeight(2)},
-		{new(excelize.FitToWidth), excelize.FitToWidth(2)},
+		{new(PageLayoutOrientation), PageLayoutOrientation(OrientationLandscape)},
+		{new(PageLayoutPaperSize), PageLayoutPaperSize(10)},
+		{new(FitToHeight), FitToHeight(2)},
+		{new(FitToWidth), FitToWidth(2)},
 	}
 
 	for i, test := range testData {
@@ -108,11 +106,11 @@ func TestPageLayoutOption(t *testing.T) {
 			opt := test.nonDefault
 			t.Logf("option %T", opt)
 
-			def := deepcopy.Copy(test.container).(excelize.PageLayoutOptionPtr)
-			val1 := deepcopy.Copy(def).(excelize.PageLayoutOptionPtr)
-			val2 := deepcopy.Copy(def).(excelize.PageLayoutOptionPtr)
+			def := deepcopy.Copy(test.container).(PageLayoutOptionPtr)
+			val1 := deepcopy.Copy(def).(PageLayoutOptionPtr)
+			val2 := deepcopy.Copy(def).(PageLayoutOptionPtr)
 
-			f := excelize.NewFile()
+			f := NewFile()
 			// Get the default value
 			assert.NoError(t, f.GetPageLayout(sheet, def), opt)
 			// Get again and check
@@ -150,7 +148,7 @@ func TestPageLayoutOption(t *testing.T) {
 }
 
 func TestSearchSheet(t *testing.T) {
-	f, err := excelize.OpenFile(filepath.Join("test", "SharedStrings.xlsx"))
+	f, err := OpenFile(filepath.Join("test", "SharedStrings.xlsx"))
 	if !assert.NoError(t, err) {
 		t.FailNow()
 	}
@@ -172,36 +170,36 @@ func TestSearchSheet(t *testing.T) {
 	assert.EqualValues(t, expected, result)
 
 	// Test search worksheet data after set cell value
-	f = excelize.NewFile()
+	f = NewFile()
 	assert.NoError(t, f.SetCellValue("Sheet1", "A1", true))
 	_, err = f.SearchSheet("Sheet1", "")
 	assert.NoError(t, err)
 }
 
 func TestSetPageLayout(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	// Test set page layout on not exists worksheet.
 	assert.EqualError(t, f.SetPageLayout("SheetN"), "sheet SheetN is not exist")
 }
 
 func TestGetPageLayout(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	// Test get page layout on not exists worksheet.
 	assert.EqualError(t, f.GetPageLayout("SheetN"), "sheet SheetN is not exist")
 }
 
 func TestSetHeaderFooter(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	assert.NoError(t, f.SetCellStr("Sheet1", "A1", "Test SetHeaderFooter"))
 	// Test set header and footer on not exists worksheet.
 	assert.EqualError(t, f.SetHeaderFooter("SheetN", nil), "sheet SheetN is not exist")
 	// Test set header and footer with illegal setting.
-	assert.EqualError(t, f.SetHeaderFooter("Sheet1", &excelize.FormatHeaderFooter{
+	assert.EqualError(t, f.SetHeaderFooter("Sheet1", &FormatHeaderFooter{
 		OddHeader: strings.Repeat("c", 256),
 	}), "field OddHeader must be less than 255 characters")
 
 	assert.NoError(t, f.SetHeaderFooter("Sheet1", nil))
-	assert.NoError(t, f.SetHeaderFooter("Sheet1", &excelize.FormatHeaderFooter{
+	assert.NoError(t, f.SetHeaderFooter("Sheet1", &FormatHeaderFooter{
 		DifferentFirst:   true,
 		DifferentOddEven: true,
 		OddHeader:        "&R&P",
@@ -214,28 +212,28 @@ func TestSetHeaderFooter(t *testing.T) {
 }
 
 func TestDefinedName(t *testing.T) {
-	f := excelize.NewFile()
-	assert.NoError(t, f.SetDefinedName(&excelize.DefinedName{
+	f := NewFile()
+	assert.NoError(t, f.SetDefinedName(&DefinedName{
 		Name:     "Amount",
 		RefersTo: "Sheet1!$A$2:$D$5",
 		Comment:  "defined name comment",
 		Scope:    "Sheet1",
 	}))
-	assert.NoError(t, f.SetDefinedName(&excelize.DefinedName{
+	assert.NoError(t, f.SetDefinedName(&DefinedName{
 		Name:     "Amount",
 		RefersTo: "Sheet1!$A$2:$D$5",
 		Comment:  "defined name comment",
 	}))
-	assert.EqualError(t, f.SetDefinedName(&excelize.DefinedName{
+	assert.EqualError(t, f.SetDefinedName(&DefinedName{
 		Name:     "Amount",
 		RefersTo: "Sheet1!$A$2:$D$5",
 		Comment:  "defined name comment",
 	}), "the same name already exists on the scope")
-	assert.EqualError(t, f.DeleteDefinedName(&excelize.DefinedName{
+	assert.EqualError(t, f.DeleteDefinedName(&DefinedName{
 		Name: "No Exist Defined Name",
 	}), "no defined name on the scope")
 	assert.Exactly(t, "Sheet1!$A$2:$D$5", f.GetDefinedName()[1].RefersTo)
-	assert.NoError(t, f.DeleteDefinedName(&excelize.DefinedName{
+	assert.NoError(t, f.DeleteDefinedName(&DefinedName{
 		Name: "Amount",
 	}))
 	assert.Exactly(t, "Sheet1!$A$2:$D$5", f.GetDefinedName()[0].RefersTo)
@@ -244,7 +242,7 @@ func TestDefinedName(t *testing.T) {
 }
 
 func TestGroupSheets(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	sheets := []string{"Sheet2", "Sheet3"}
 	for _, sheet := range sheets {
 		f.NewSheet(sheet)
@@ -256,7 +254,7 @@ func TestGroupSheets(t *testing.T) {
 }
 
 func TestUngroupSheets(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	sheets := []string{"Sheet2", "Sheet3", "Sheet4", "Sheet5"}
 	for _, sheet := range sheets {
 		f.NewSheet(sheet)
@@ -265,7 +263,7 @@ func TestUngroupSheets(t *testing.T) {
 }
 
 func TestInsertPageBreak(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	assert.NoError(t, f.InsertPageBreak("Sheet1", "A1"))
 	assert.NoError(t, f.InsertPageBreak("Sheet1", "B2"))
 	assert.NoError(t, f.InsertPageBreak("Sheet1", "C3"))
@@ -276,7 +274,7 @@ func TestInsertPageBreak(t *testing.T) {
 }
 
 func TestRemovePageBreak(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	assert.NoError(t, f.RemovePageBreak("Sheet1", "A2"))
 
 	assert.NoError(t, f.InsertPageBreak("Sheet1", "A2"))
@@ -302,7 +300,7 @@ func TestRemovePageBreak(t *testing.T) {
 }
 
 func TestGetSheetName(t *testing.T) {
-	f, _ := excelize.OpenFile(filepath.Join("test", "Book1.xlsx"))
+	f, _ := OpenFile(filepath.Join("test", "Book1.xlsx"))
 	assert.Equal(t, "Sheet1", f.GetSheetName(0))
 	assert.Equal(t, "Sheet2", f.GetSheetName(1))
 	assert.Equal(t, "", f.GetSheetName(-1))
@@ -314,7 +312,7 @@ func TestGetSheetMap(t *testing.T) {
 		1: "Sheet1",
 		2: "Sheet2",
 	}
-	f, _ := excelize.OpenFile(filepath.Join("test", "Book1.xlsx"))
+	f, _ := OpenFile(filepath.Join("test", "Book1.xlsx"))
 	sheetMap := f.GetSheetMap()
 	for idx, name := range sheetMap {
 		assert.Equal(t, expectedMap[idx], name)

sheetpr_test.go

@@ -1,4 +1,4 @@
-package excelize_test
+package excelize
 
 import (
 	"fmt"
@@ -6,39 +6,37 @@ import (
 
 	"github.com/mohae/deepcopy"
 	"github.com/stretchr/testify/assert"
-
-	"github.com/360EntSecGroup-Skylar/excelize/v2"
 )
 
-var _ = []excelize.SheetPrOption{
-	excelize.CodeName("hello"),
-	excelize.EnableFormatConditionsCalculation(false),
-	excelize.Published(false),
-	excelize.FitToPage(true),
-	excelize.AutoPageBreaks(true),
-	excelize.OutlineSummaryBelow(true),
+var _ = []SheetPrOption{
+	CodeName("hello"),
+	EnableFormatConditionsCalculation(false),
+	Published(false),
+	FitToPage(true),
+	AutoPageBreaks(true),
+	OutlineSummaryBelow(true),
 }
 
-var _ = []excelize.SheetPrOptionPtr{
-	(*excelize.CodeName)(nil),
-	(*excelize.EnableFormatConditionsCalculation)(nil),
-	(*excelize.Published)(nil),
-	(*excelize.FitToPage)(nil),
-	(*excelize.AutoPageBreaks)(nil),
-	(*excelize.OutlineSummaryBelow)(nil),
+var _ = []SheetPrOptionPtr{
+	(*CodeName)(nil),
+	(*EnableFormatConditionsCalculation)(nil),
+	(*Published)(nil),
+	(*FitToPage)(nil),
+	(*AutoPageBreaks)(nil),
+	(*OutlineSummaryBelow)(nil),
 }
 
 func ExampleFile_SetSheetPrOptions() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	if err := f.SetSheetPrOptions(sheet,
-		excelize.CodeName("code"),
-		excelize.EnableFormatConditionsCalculation(false),
-		excelize.Published(false),
-		excelize.FitToPage(true),
-		excelize.AutoPageBreaks(true),
-		excelize.OutlineSummaryBelow(false),
+		CodeName("code"),
+		EnableFormatConditionsCalculation(false),
+		Published(false),
+		FitToPage(true),
+		AutoPageBreaks(true),
+		OutlineSummaryBelow(false),
 	); err != nil {
 		fmt.Println(err)
 	}
@@ -46,16 +44,16 @@ func ExampleFile_SetSheetPrOptions() {
 }
 
 func ExampleFile_GetSheetPrOptions() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	var (
-		codeName                          excelize.CodeName
-		enableFormatConditionsCalculation excelize.EnableFormatConditionsCalculation
-		published                         excelize.Published
-		fitToPage                         excelize.FitToPage
-		autoPageBreaks                    excelize.AutoPageBreaks
-		outlineSummaryBelow               excelize.OutlineSummaryBelow
+		codeName                          CodeName
+		enableFormatConditionsCalculation EnableFormatConditionsCalculation
+		published                         Published
+		fitToPage                         FitToPage
+		autoPageBreaks                    AutoPageBreaks
+		outlineSummaryBelow               OutlineSummaryBelow
 	)
 
 	if err := f.GetSheetPrOptions(sheet,
@@ -89,15 +87,15 @@ func TestSheetPrOptions(t *testing.T) {
 	const sheet = "Sheet1"
 
 	testData := []struct {
-		container  excelize.SheetPrOptionPtr
-		nonDefault excelize.SheetPrOption
+		container  SheetPrOptionPtr
+		nonDefault SheetPrOption
 	}{
-		{new(excelize.CodeName), excelize.CodeName("xx")},
-		{new(excelize.EnableFormatConditionsCalculation), excelize.EnableFormatConditionsCalculation(false)},
-		{new(excelize.Published), excelize.Published(false)},
-		{new(excelize.FitToPage), excelize.FitToPage(true)},
-		{new(excelize.AutoPageBreaks), excelize.AutoPageBreaks(true)},
-		{new(excelize.OutlineSummaryBelow), excelize.OutlineSummaryBelow(false)},
+		{new(CodeName), CodeName("xx")},
+		{new(EnableFormatConditionsCalculation), EnableFormatConditionsCalculation(false)},
+		{new(Published), Published(false)},
+		{new(FitToPage), FitToPage(true)},
+		{new(AutoPageBreaks), AutoPageBreaks(true)},
+		{new(OutlineSummaryBelow), OutlineSummaryBelow(false)},
 	}
 
 	for i, test := range testData {
@@ -106,11 +104,11 @@ func TestSheetPrOptions(t *testing.T) {
 			opt := test.nonDefault
 			t.Logf("option %T", opt)
 
-			def := deepcopy.Copy(test.container).(excelize.SheetPrOptionPtr)
-			val1 := deepcopy.Copy(def).(excelize.SheetPrOptionPtr)
-			val2 := deepcopy.Copy(def).(excelize.SheetPrOptionPtr)
+			def := deepcopy.Copy(test.container).(SheetPrOptionPtr)
+			val1 := deepcopy.Copy(def).(SheetPrOptionPtr)
+			val2 := deepcopy.Copy(def).(SheetPrOptionPtr)
 
-			f := excelize.NewFile()
+			f := NewFile()
 			// Get the default value
 			assert.NoError(t, f.GetSheetPrOptions(sheet, def), opt)
 			// Get again and check
@@ -148,46 +146,46 @@ func TestSheetPrOptions(t *testing.T) {
 }
 
 func TestSetSheetrOptions(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	// Test SetSheetrOptions on not exists worksheet.
 	assert.EqualError(t, f.SetSheetPrOptions("SheetN"), "sheet SheetN is not exist")
 }
 
 func TestGetSheetPrOptions(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	// Test GetSheetPrOptions on not exists worksheet.
 	assert.EqualError(t, f.GetSheetPrOptions("SheetN"), "sheet SheetN is not exist")
 }
 
-var _ = []excelize.PageMarginsOptions{
-	excelize.PageMarginBottom(1.0),
-	excelize.PageMarginFooter(1.0),
-	excelize.PageMarginHeader(1.0),
-	excelize.PageMarginLeft(1.0),
-	excelize.PageMarginRight(1.0),
-	excelize.PageMarginTop(1.0),
+var _ = []PageMarginsOptions{
+	PageMarginBottom(1.0),
+	PageMarginFooter(1.0),
+	PageMarginHeader(1.0),
+	PageMarginLeft(1.0),
+	PageMarginRight(1.0),
+	PageMarginTop(1.0),
 }
 
-var _ = []excelize.PageMarginsOptionsPtr{
-	(*excelize.PageMarginBottom)(nil),
-	(*excelize.PageMarginFooter)(nil),
-	(*excelize.PageMarginHeader)(nil),
-	(*excelize.PageMarginLeft)(nil),
-	(*excelize.PageMarginRight)(nil),
-	(*excelize.PageMarginTop)(nil),
+var _ = []PageMarginsOptionsPtr{
+	(*PageMarginBottom)(nil),
+	(*PageMarginFooter)(nil),
+	(*PageMarginHeader)(nil),
+	(*PageMarginLeft)(nil),
+	(*PageMarginRight)(nil),
+	(*PageMarginTop)(nil),
 }
 
 func ExampleFile_SetPageMargins() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	if err := f.SetPageMargins(sheet,
-		excelize.PageMarginBottom(1.0),
-		excelize.PageMarginFooter(1.0),
-		excelize.PageMarginHeader(1.0),
-		excelize.PageMarginLeft(1.0),
-		excelize.PageMarginRight(1.0),
-		excelize.PageMarginTop(1.0),
+		PageMarginBottom(1.0),
+		PageMarginFooter(1.0),
+		PageMarginHeader(1.0),
+		PageMarginLeft(1.0),
+		PageMarginRight(1.0),
+		PageMarginTop(1.0),
 	); err != nil {
 		fmt.Println(err)
 	}
@@ -195,16 +193,16 @@ func ExampleFile_SetPageMargins() {
 }
 
 func ExampleFile_GetPageMargins() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	var (
-		marginBottom excelize.PageMarginBottom
-		marginFooter excelize.PageMarginFooter
-		marginHeader excelize.PageMarginHeader
-		marginLeft   excelize.PageMarginLeft
-		marginRight  excelize.PageMarginRight
-		marginTop    excelize.PageMarginTop
+		marginBottom PageMarginBottom
+		marginFooter PageMarginFooter
+		marginHeader PageMarginHeader
+		marginLeft   PageMarginLeft
+		marginRight  PageMarginRight
+		marginTop    PageMarginTop
 	)
 
 	if err := f.GetPageMargins(sheet,
@@ -238,15 +236,15 @@ func TestPageMarginsOption(t *testing.T) {
 	const sheet = "Sheet1"
 
 	testData := []struct {
-		container  excelize.PageMarginsOptionsPtr
-		nonDefault excelize.PageMarginsOptions
+		container  PageMarginsOptionsPtr
+		nonDefault PageMarginsOptions
 	}{
-		{new(excelize.PageMarginTop), excelize.PageMarginTop(1.0)},
-		{new(excelize.PageMarginBottom), excelize.PageMarginBottom(1.0)},
-		{new(excelize.PageMarginLeft), excelize.PageMarginLeft(1.0)},
-		{new(excelize.PageMarginRight), excelize.PageMarginRight(1.0)},
-		{new(excelize.PageMarginHeader), excelize.PageMarginHeader(1.0)},
-		{new(excelize.PageMarginFooter), excelize.PageMarginFooter(1.0)},
+		{new(PageMarginTop), PageMarginTop(1.0)},
+		{new(PageMarginBottom), PageMarginBottom(1.0)},
+		{new(PageMarginLeft), PageMarginLeft(1.0)},
+		{new(PageMarginRight), PageMarginRight(1.0)},
+		{new(PageMarginHeader), PageMarginHeader(1.0)},
+		{new(PageMarginFooter), PageMarginFooter(1.0)},
 	}
 
 	for i, test := range testData {
@@ -255,11 +253,11 @@ func TestPageMarginsOption(t *testing.T) {
 			opt := test.nonDefault
 			t.Logf("option %T", opt)
 
-			def := deepcopy.Copy(test.container).(excelize.PageMarginsOptionsPtr)
-			val1 := deepcopy.Copy(def).(excelize.PageMarginsOptionsPtr)
-			val2 := deepcopy.Copy(def).(excelize.PageMarginsOptionsPtr)
+			def := deepcopy.Copy(test.container).(PageMarginsOptionsPtr)
+			val1 := deepcopy.Copy(def).(PageMarginsOptionsPtr)
+			val2 := deepcopy.Copy(def).(PageMarginsOptionsPtr)
 
-			f := excelize.NewFile()
+			f := NewFile()
 			// Get the default value
 			assert.NoError(t, f.GetPageMargins(sheet, def), opt)
 			// Get again and check
@@ -297,29 +295,29 @@ func TestPageMarginsOption(t *testing.T) {
 }
 
 func TestSetPageMargins(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	// Test set page margins on not exists worksheet.
 	assert.EqualError(t, f.SetPageMargins("SheetN"), "sheet SheetN is not exist")
 }
 
 func TestGetPageMargins(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	// Test get page margins on not exists worksheet.
 	assert.EqualError(t, f.GetPageMargins("SheetN"), "sheet SheetN is not exist")
 }
 
 func ExampleFile_SetSheetFormatPr() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	if err := f.SetSheetFormatPr(sheet,
-		excelize.BaseColWidth(1.0),
-		excelize.DefaultColWidth(1.0),
-		excelize.DefaultRowHeight(1.0),
-		excelize.CustomHeight(true),
-		excelize.ZeroHeight(true),
-		excelize.ThickTop(true),
-		excelize.ThickBottom(true),
+		BaseColWidth(1.0),
+		DefaultColWidth(1.0),
+		DefaultRowHeight(1.0),
+		CustomHeight(true),
+		ZeroHeight(true),
+		ThickTop(true),
+		ThickBottom(true),
 	); err != nil {
 		fmt.Println(err)
 	}
@@ -327,17 +325,17 @@ func ExampleFile_SetSheetFormatPr() {
 }
 
 func ExampleFile_GetSheetFormatPr() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	var (
-		baseColWidth     excelize.BaseColWidth
-		defaultColWidth  excelize.DefaultColWidth
-		defaultRowHeight excelize.DefaultRowHeight
-		customHeight     excelize.CustomHeight
-		zeroHeight       excelize.ZeroHeight
-		thickTop         excelize.ThickTop
-		thickBottom      excelize.ThickBottom
+		baseColWidth     BaseColWidth
+		defaultColWidth  DefaultColWidth
+		defaultRowHeight DefaultRowHeight
+		customHeight     CustomHeight
+		zeroHeight       ZeroHeight
+		thickTop         ThickTop
+		thickBottom      ThickBottom
 	)
 
 	if err := f.GetSheetFormatPr(sheet,
@@ -374,16 +372,16 @@ func TestSheetFormatPrOptions(t *testing.T) {
 	const sheet = "Sheet1"
 
 	testData := []struct {
-		container  excelize.SheetFormatPrOptionsPtr
-		nonDefault excelize.SheetFormatPrOptions
+		container  SheetFormatPrOptionsPtr
+		nonDefault SheetFormatPrOptions
 	}{
-		{new(excelize.BaseColWidth), excelize.BaseColWidth(1.0)},
-		{new(excelize.DefaultColWidth), excelize.DefaultColWidth(1.0)},
-		{new(excelize.DefaultRowHeight), excelize.DefaultRowHeight(1.0)},
-		{new(excelize.CustomHeight), excelize.CustomHeight(true)},
-		{new(excelize.ZeroHeight), excelize.ZeroHeight(true)},
-		{new(excelize.ThickTop), excelize.ThickTop(true)},
-		{new(excelize.ThickBottom), excelize.ThickBottom(true)},
+		{new(BaseColWidth), BaseColWidth(1.0)},
+		{new(DefaultColWidth), DefaultColWidth(1.0)},
+		{new(DefaultRowHeight), DefaultRowHeight(1.0)},
+		{new(CustomHeight), CustomHeight(true)},
+		{new(ZeroHeight), ZeroHeight(true)},
+		{new(ThickTop), ThickTop(true)},
+		{new(ThickBottom), ThickBottom(true)},
 	}
 
 	for i, test := range testData {
@@ -392,11 +390,11 @@ func TestSheetFormatPrOptions(t *testing.T) {
 			opt := test.nonDefault
 			t.Logf("option %T", opt)
 
-			def := deepcopy.Copy(test.container).(excelize.SheetFormatPrOptionsPtr)
-			val1 := deepcopy.Copy(def).(excelize.SheetFormatPrOptionsPtr)
-			val2 := deepcopy.Copy(def).(excelize.SheetFormatPrOptionsPtr)
+			def := deepcopy.Copy(test.container).(SheetFormatPrOptionsPtr)
+			val1 := deepcopy.Copy(def).(SheetFormatPrOptionsPtr)
+			val2 := deepcopy.Copy(def).(SheetFormatPrOptionsPtr)
 
-			f := excelize.NewFile()
+			f := NewFile()
 			// Get the default value
 			assert.NoError(t, f.GetSheetFormatPr(sheet, def), opt)
 			// Get again and check
@@ -434,26 +432,26 @@ func TestSheetFormatPrOptions(t *testing.T) {
 }
 
 func TestSetSheetFormatPr(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	assert.NoError(t, f.GetSheetFormatPr("Sheet1"))
 	f.Sheet["xl/worksheets/sheet1.xml"].SheetFormatPr = nil
-	assert.NoError(t, f.SetSheetFormatPr("Sheet1", excelize.BaseColWidth(1.0)))
+	assert.NoError(t, f.SetSheetFormatPr("Sheet1", BaseColWidth(1.0)))
 	// Test set formatting properties on not exists worksheet.
 	assert.EqualError(t, f.SetSheetFormatPr("SheetN"), "sheet SheetN is not exist")
 }
 
 func TestGetSheetFormatPr(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	assert.NoError(t, f.GetSheetFormatPr("Sheet1"))
 	f.Sheet["xl/worksheets/sheet1.xml"].SheetFormatPr = nil
 	var (
-		baseColWidth     excelize.BaseColWidth
-		defaultColWidth  excelize.DefaultColWidth
-		defaultRowHeight excelize.DefaultRowHeight
-		customHeight     excelize.CustomHeight
-		zeroHeight       excelize.ZeroHeight
-		thickTop         excelize.ThickTop
-		thickBottom      excelize.ThickBottom
+		baseColWidth     BaseColWidth
+		defaultColWidth  DefaultColWidth
+		defaultRowHeight DefaultRowHeight
+		customHeight     CustomHeight
+		zeroHeight       ZeroHeight
+		thickTop         ThickTop
+		thickBottom      ThickBottom
 	)
 	assert.NoError(t, f.GetSheetFormatPr("Sheet1",
 		&baseColWidth,

sheetview_test.go

@@ -1,60 +1,58 @@
-package excelize_test
+package excelize
 
 import (
 	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-
-	"github.com/360EntSecGroup-Skylar/excelize/v2"
 )
 
-var _ = []excelize.SheetViewOption{
-	excelize.DefaultGridColor(true),
-	excelize.RightToLeft(false),
-	excelize.ShowFormulas(false),
-	excelize.ShowGridLines(true),
-	excelize.ShowRowColHeaders(true),
-	excelize.TopLeftCell("B2"),
+var _ = []SheetViewOption{
+	DefaultGridColor(true),
+	RightToLeft(false),
+	ShowFormulas(false),
+	ShowGridLines(true),
+	ShowRowColHeaders(true),
+	TopLeftCell("B2"),
 	// SheetViewOptionPtr are also SheetViewOption
-	new(excelize.DefaultGridColor),
-	new(excelize.RightToLeft),
-	new(excelize.ShowFormulas),
-	new(excelize.ShowGridLines),
-	new(excelize.ShowRowColHeaders),
-	new(excelize.TopLeftCell),
+	new(DefaultGridColor),
+	new(RightToLeft),
+	new(ShowFormulas),
+	new(ShowGridLines),
+	new(ShowRowColHeaders),
+	new(TopLeftCell),
 }
 
-var _ = []excelize.SheetViewOptionPtr{
-	(*excelize.DefaultGridColor)(nil),
-	(*excelize.RightToLeft)(nil),
-	(*excelize.ShowFormulas)(nil),
-	(*excelize.ShowGridLines)(nil),
-	(*excelize.ShowRowColHeaders)(nil),
-	(*excelize.TopLeftCell)(nil),
+var _ = []SheetViewOptionPtr{
+	(*DefaultGridColor)(nil),
+	(*RightToLeft)(nil),
+	(*ShowFormulas)(nil),
+	(*ShowGridLines)(nil),
+	(*ShowRowColHeaders)(nil),
+	(*TopLeftCell)(nil),
 }
 
 func ExampleFile_SetSheetViewOptions() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	if err := f.SetSheetViewOptions(sheet, 0,
-		excelize.DefaultGridColor(false),
-		excelize.RightToLeft(false),
-		excelize.ShowFormulas(true),
-		excelize.ShowGridLines(true),
-		excelize.ShowRowColHeaders(true),
-		excelize.ZoomScale(80),
-		excelize.TopLeftCell("C3"),
+		DefaultGridColor(false),
+		RightToLeft(false),
+		ShowFormulas(true),
+		ShowGridLines(true),
+		ShowRowColHeaders(true),
+		ZoomScale(80),
+		TopLeftCell("C3"),
 	); err != nil {
 		fmt.Println(err)
 	}
 
-	var zoomScale excelize.ZoomScale
+	var zoomScale ZoomScale
 	fmt.Println("Default:")
 	fmt.Println("- zoomScale: 80")
 
-	if err := f.SetSheetViewOptions(sheet, 0, excelize.ZoomScale(500)); err != nil {
+	if err := f.SetSheetViewOptions(sheet, 0, ZoomScale(500)); err != nil {
 		fmt.Println(err)
 	}
 
@@ -65,7 +63,7 @@ func ExampleFile_SetSheetViewOptions() {
 	fmt.Println("Used out of range value:")
 	fmt.Println("- zoomScale:", zoomScale)
 
-	if err := f.SetSheetViewOptions(sheet, 0, excelize.ZoomScale(123)); err != nil {
+	if err := f.SetSheetViewOptions(sheet, 0, ZoomScale(123)); err != nil {
 		fmt.Println(err)
 	}
 
@@ -87,18 +85,18 @@ func ExampleFile_SetSheetViewOptions() {
 }
 
 func ExampleFile_GetSheetViewOptions() {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	var (
-		defaultGridColor  excelize.DefaultGridColor
-		rightToLeft       excelize.RightToLeft
-		showFormulas      excelize.ShowFormulas
-		showGridLines     excelize.ShowGridLines
-		showZeros         excelize.ShowZeros
-		showRowColHeaders excelize.ShowRowColHeaders
-		zoomScale         excelize.ZoomScale
-		topLeftCell       excelize.TopLeftCell
+		defaultGridColor  DefaultGridColor
+		rightToLeft       RightToLeft
+		showFormulas      ShowFormulas
+		showGridLines     ShowGridLines
+		showZeros         ShowZeros
+		showRowColHeaders ShowRowColHeaders
+		zoomScale         ZoomScale
+		topLeftCell       TopLeftCell
 	)
 
 	if err := f.GetSheetViewOptions(sheet, 0,
@@ -124,7 +122,7 @@ func ExampleFile_GetSheetViewOptions() {
 	fmt.Println("- zoomScale:", zoomScale)
 	fmt.Println("- topLeftCell:", `"`+topLeftCell+`"`)
 
-	if err := f.SetSheetViewOptions(sheet, 0, excelize.TopLeftCell("B2")); err != nil {
+	if err := f.SetSheetViewOptions(sheet, 0, TopLeftCell("B2")); err != nil {
 		fmt.Println(err)
 	}
 
@@ -132,7 +130,7 @@ func ExampleFile_GetSheetViewOptions() {
 		fmt.Println(err)
 	}
 
-	if err := f.SetSheetViewOptions(sheet, 0, excelize.ShowGridLines(false)); err != nil {
+	if err := f.SetSheetViewOptions(sheet, 0, ShowGridLines(false)); err != nil {
 		fmt.Println(err)
 	}
 
@@ -140,7 +138,7 @@ func ExampleFile_GetSheetViewOptions() {
 		fmt.Println(err)
 	}
 
-	if err := f.SetSheetViewOptions(sheet, 0, excelize.ShowZeros(false)); err != nil {
+	if err := f.SetSheetViewOptions(sheet, 0, ShowZeros(false)); err != nil {
 		fmt.Println(err)
 	}
 
@@ -170,7 +168,7 @@ func ExampleFile_GetSheetViewOptions() {
 }
 
 func TestSheetViewOptionsErrors(t *testing.T) {
-	f := excelize.NewFile()
+	f := NewFile()
 	const sheet = "Sheet1"
 
 	assert.NoError(t, f.GetSheetViewOptions(sheet, 0))

styles.go

@@ -21,6 +21,7 @@ import (
 	"log"
 	"math"
 	"reflect"
+	"regexp"
 	"strconv"
 	"strings"
 )
@@ -755,7 +756,7 @@ var currencyNumFmt = map[int]string{
 
 // builtInNumFmtFunc defined the format conversion functions map. Partial format
 // code doesn't support currently and will return original string.
-var builtInNumFmtFunc = map[int]func(i int, v string) string{
+var builtInNumFmtFunc = map[int]func(v string, format string) string{
 	0:  formatToString,
 	1:  formatToInt,
 	2:  formatToFloat,
@@ -847,14 +848,14 @@ var criteriaType = map[string]string{
 
 // formatToString provides a function to return original string by given
 // built-in number formats code and cell string.
-func formatToString(i int, v string) string {
+func formatToString(v string, format string) string {
 	return v
 }
 
 // formatToInt provides a function to convert original string to integer
 // format as string type by given built-in number formats code and cell
 // string.
-func formatToInt(i int, v string) string {
+func formatToInt(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -865,7 +866,7 @@ func formatToInt(i int, v string) string {
 // formatToFloat provides a function to convert original string to float
 // format as string type by given built-in number formats code and cell
 // string.
-func formatToFloat(i int, v string) string {
+func formatToFloat(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -875,7 +876,7 @@ func formatToFloat(i int, v string) string {
 
 // formatToA provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
-func formatToA(i int, v string) string {
+func formatToA(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -890,7 +891,7 @@ func formatToA(i int, v string) string {
 
 // formatToB provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
-func formatToB(i int, v string) string {
+func formatToB(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -903,7 +904,7 @@ func formatToB(i int, v string) string {
 
 // formatToC provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
-func formatToC(i int, v string) string {
+func formatToC(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -914,7 +915,7 @@ func formatToC(i int, v string) string {
 
 // formatToD provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
-func formatToD(i int, v string) string {
+func formatToD(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -925,7 +926,7 @@ func formatToD(i int, v string) string {
 
 // formatToE provides a function to convert original string to special format
 // as string type by given built-in number formats code and cell string.
-func formatToE(i int, v string) string {
+func formatToE(v string, format string) string {
 	f, err := strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
@@ -933,6 +934,8 @@ func formatToE(i int, v string) string {
 	return fmt.Sprintf("%.e", f)
 }
 
+var dateTimeFormatsCache = map[string]string{}
+
 // parseTime provides a function to returns a string parsed using time.Time.
 // Replace Excel placeholders with Go time placeholders. For example, replace
 // yyyy with 2006. These are in a specific order, due to the fact that m is
@@ -944,15 +947,46 @@ func formatToE(i int, v string) string {
 // arbitrary characters unused in Excel Date formats, and then at the end,
 // turn them to what they should actually be. Based off:
 // http://www.ozgrid.com/Excel/CustomFormats.htm
-func parseTime(i int, v string) string {
-	f, err := strconv.ParseFloat(v, 64)
+func parseTime(v string, format string) string {
+	var (
+		f     float64
+		err   error
+		goFmt string
+	)
+	f, err = strconv.ParseFloat(v, 64)
 	if err != nil {
 		return v
 	}
 	val := timeFromExcelTime(f, false)
-	format := builtInNumFmt[i]
+
+	if format == "" {
+		return v
+	}
+
+	goFmt, found := dateTimeFormatsCache[format]
+	if found {
+		return val.Format(goFmt)
+	}
+
+	goFmt = format
+
+	if strings.Contains(goFmt, "[") {
+		var re = regexp.MustCompile(`\[.+\]`)
+		goFmt = re.ReplaceAllLiteralString(goFmt, "")
+	}
+
+	// use only first variant
+	if strings.Contains(goFmt, ";") {
+		goFmt = goFmt[:strings.IndexByte(goFmt, ';')]
+	}
 
 	replacements := []struct{ xltime, gotime string }{
+		{"YYYY", "2006"},
+		{"YY", "06"},
+		{"MM", "01"},
+		{"M", "1"},
+		{"DD", "02"},
+		{"D", "2"},
 		{"yyyy", "2006"},
 		{"yy", "06"},
 		{"mmmm", "%%%%"},
@@ -962,38 +996,59 @@ func parseTime(i int, v string) string {
 		{"mmm", "Jan"},
 		{"mmss", "0405"},
 		{"ss", "05"},
+		{"s", "5"},
 		{"mm:", "04:"},
 		{":mm", ":04"},
+		{"m:", "4:"},
+		{":m", ":4"},
 		{"mm", "01"},
 		{"am/pm", "pm"},
 		{"m/", "1/"},
 		{"%%%%", "January"},
 		{"&&&&", "Monday"},
 	}
+
+	replacementsGlobal := []struct{ xltime, gotime string }{
+		{"\\-", "-"},
+		{"\\ ", " "},
+		{"\\.", "."},
+		{"\\", ""},
+	}
 	// It is the presence of the "am/pm" indicator that determines if this is
 	// a 12 hour or 24 hours time format, not the number of 'h' characters.
 	if is12HourTime(format) {
-		format = strings.Replace(format, "hh", "03", 1)
-		format = strings.Replace(format, "h", "3", 1)
+		goFmt = strings.Replace(goFmt, "hh", "3", 1)
+		goFmt = strings.Replace(goFmt, "h", "3", 1)
+		goFmt = strings.Replace(goFmt, "HH", "3", 1)
+		goFmt = strings.Replace(goFmt, "H", "3", 1)
 	} else {
-		format = strings.Replace(format, "hh", "15", 1)
-		format = strings.Replace(format, "h", "15", 1)
+		goFmt = strings.Replace(goFmt, "hh", "15", 1)
+		goFmt = strings.Replace(goFmt, "h", "3", 1)
+		goFmt = strings.Replace(goFmt, "HH", "15", 1)
+		goFmt = strings.Replace(goFmt, "H", "3", 1)
 	}
+
 	for _, repl := range replacements {
-		format = strings.Replace(format, repl.xltime, repl.gotime, 1)
+		goFmt = strings.Replace(goFmt, repl.xltime, repl.gotime, 1)
+	}
+	for _, repl := range replacementsGlobal {
+		goFmt = strings.Replace(goFmt, repl.xltime, repl.gotime, -1)
 	}
 	// If the hour is optional, strip it out, along with the possible dangling
 	// colon that would remain.
 	if val.Hour() < 1 {
-		format = strings.Replace(format, "]:", "]", 1)
-		format = strings.Replace(format, "[03]", "", 1)
-		format = strings.Replace(format, "[3]", "", 1)
-		format = strings.Replace(format, "[15]", "", 1)
+		goFmt = strings.Replace(goFmt, "]:", "]", 1)
+		goFmt = strings.Replace(goFmt, "[03]", "", 1)
+		goFmt = strings.Replace(goFmt, "[3]", "", 1)
+		goFmt = strings.Replace(goFmt, "[15]", "", 1)
 	} else {
-		format = strings.Replace(format, "[3]", "3", 1)
-		format = strings.Replace(format, "[15]", "15", 1)
+		goFmt = strings.Replace(goFmt, "[3]", "3", 1)
+		goFmt = strings.Replace(goFmt, "[15]", "15", 1)
 	}
-	return val.Format(format)
+
+	dateTimeFormatsCache[format] = goFmt
+
+	return val.Format(goFmt)
 }
 
 // is12HourTime checks whether an Excel time format string is a 12 hours form.
@@ -2226,6 +2281,7 @@ func newNumFmt(styleSheet *xlsxStyleSheet, style *Style) int {
 // setCustomNumFmt provides a function to set custom number format code.
 func setCustomNumFmt(styleSheet *xlsxStyleSheet, style *Style) int {
 	nf := xlsxNumFmt{FormatCode: *style.CustomNumFmt}
+
 	if styleSheet.NumFmts != nil {
 		nf.NumFmtID = styleSheet.NumFmts.NumFmt[len(styleSheet.NumFmts.NumFmt)-1].NumFmtID + 1
 		styleSheet.NumFmts.NumFmt = append(styleSheet.NumFmts.NumFmt, &nf)

styles_test.go

@@ -201,10 +201,44 @@ func TestNewStyle(t *testing.T) {
 	assert.NoError(t, err)
 	_, err = f.NewStyle(Style{})
 	assert.EqualError(t, err, "invalid parameter type")
+
 	_, err = f.NewStyle(&Style{Font: &Font{Family: strings.Repeat("s", MaxFontFamilyLength+1)}})
 	assert.EqualError(t, err, "the length of the font family name must be smaller than or equal to 31")
 	_, err = f.NewStyle(&Style{Font: &Font{Size: MaxFontSize + 1}})
 	assert.EqualError(t, err, "font size must be between 1 and 409 points")
+
+	// new numeric custom style
+	fmt := "####;####"
+	f.Styles.NumFmts = nil
+	styleID, err = f.NewStyle(&Style{
+		CustomNumFmt: &fmt,
+	})
+	assert.NoError(t, err)
+	assert.Equal(t, 2, styleID)
+
+	assert.NotNil(t, f.Styles)
+	assert.NotNil(t, f.Styles.CellXfs)
+	assert.NotNil(t, f.Styles.CellXfs.Xf)
+
+	nf := f.Styles.CellXfs.Xf[styleID]
+	assert.Equal(t, 164, *nf.NumFmtID)
+
+	// new currency custom style
+	f.Styles.NumFmts = nil
+	styleID, err = f.NewStyle(&Style{
+		Lang:   "ko-kr",
+		NumFmt: 32, // must not be in currencyNumFmt
+
+	})
+	assert.NoError(t, err)
+	assert.Equal(t, 3, styleID)
+
+	assert.NotNil(t, f.Styles)
+	assert.NotNil(t, f.Styles.CellXfs)
+	assert.NotNil(t, f.Styles.CellXfs.Xf)
+
+	nf = f.Styles.CellXfs.Xf[styleID]
+	assert.Equal(t, 32, *nf.NumFmtID)
 }
 
 func TestGetDefaultFont(t *testing.T) {
@@ -250,3 +284,15 @@ func TestGetStyleID(t *testing.T) {
 func TestGetFillID(t *testing.T) {
 	assert.Equal(t, -1, getFillID(NewFile().stylesReader(), &Style{Fill: Fill{Type: "unknown"}}))
 }
+
+func TestParseTime(t *testing.T) {
+	assert.Equal(t, "2019", parseTime("43528", "YYYY"))
+	assert.Equal(t, "43528", parseTime("43528", ""))
+
+	assert.Equal(t, "2019-03-04 05:05:42", parseTime("43528.2123", "YYYY-MM-DD hh:mm:ss"))
+	assert.Equal(t, "2019-03-04 05:05:42", parseTime("43528.2123", "YYYY-MM-DD hh:mm:ss;YYYY-MM-DD hh:mm:ss"))
+	assert.Equal(t, "3/4/2019 5:5:42", parseTime("43528.2123", "M/D/YYYY h:m:s"))
+	assert.Equal(t, "March", parseTime("43528", "mmmm"))
+	assert.Equal(t, "Monday", parseTime("43528", "dddd"))
+
+}