Fixed #823, 12/24 hours time format parsing error

cell_test.go

@@ -121,7 +121,7 @@ func TestSetCellValues(t *testing.T) {
 
 	v, err := f.GetCellValue("Sheet1", "A1")
 	assert.NoError(t, err)
-	assert.Equal(t, v, "12/31/10 12:00")
+	assert.Equal(t, v, "12/31/10 00:00")
 
 	// 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))

styles.go

@@ -48,7 +48,7 @@ var builtInNumFmt = map[int]string{
 	19: "h:mm:ss am/pm",
 	20: "h:mm",
 	21: "h:mm:ss",
-	22: "m/d/yy h:mm",
+	22: "m/d/yy hh:mm",
 	37: "#,##0 ;(#,##0)",
 	38: "#,##0 ;[red](#,##0)",
 	39: "#,##0.00;(#,##0.00)",