- Formatted cell data support, fix issue qax-os#48;

- Function `SetCellValue()` support `time.Time` data type parameter, relate issue qax-os#49;
- go doc and go test updated

cell.go

@@ -6,8 +6,10 @@ import (
 	"strings"
 )
 
-// GetCellValue provides function to get value from cell by given sheet index
-// and axis in XLSX file.
+// GetCellValue provides function to get formatted value from cell by given
+// sheet index and axis in XLSX file. If it is possible to apply a format to the
+// cell value, it will do so, if not then an error will be returned, along with
+// the raw value of the cell.
 func (f *File) GetCellValue(sheet, axis string) string {
 	xlsx := f.workSheetReader(sheet)
 	axis = strings.ToUpper(axis)
@@ -44,17 +46,29 @@ func (f *File) GetCellValue(sheet, axis string) string {
 				xlsxSI := 0
 				xlsxSI, _ = strconv.Atoi(r.V)
 				xml.Unmarshal([]byte(f.readXML("xl/sharedStrings.xml")), &shardStrings)
-				return shardStrings.SI[xlsxSI].T
+				return f.formattedValue(r.S, shardStrings.SI[xlsxSI].T)
 			case "str":
-				return r.V
+				return f.formattedValue(r.S, r.V)
 			default:
-				return r.V
+				return f.formattedValue(r.S, r.V)
 			}
 		}
 	}
 	return ""
 }
 
+// formattedValue provides function to returns a value after formatted. If it is
+// possible to apply a format to the cell value, it will do so, if not then an
+// error will be returned, along with the raw value of the cell.
+func (f *File) formattedValue(s int, v string) string {
+	if s == 0 {
+		return v
+	}
+	var styleSheet xlsxStyleSheet
+	xml.Unmarshal([]byte(f.readXML("xl/styles.xml")), &styleSheet)
+	return builtInNumFmtFunc[styleSheet.CellXfs.Xf[s].NumFmtID](styleSheet.CellXfs.Xf[s].NumFmtID, v)
+}
+
 // GetCellFormula provides function to get formula from cell by given sheet
 // index and axis in XLSX file.
 func (f *File) GetCellFormula(sheet, axis string) string {

date.go

@@ -0,0 +1,119 @@
+package excelize
+
+import (
+	"math"
+	"time"
+)
+
+// timeLocationUTC defined the UTC time location.
+var timeLocationUTC, _ = time.LoadLocation("UTC")
+
+// timeToUTCTime provides function to convert time to UTC time.
+func timeToUTCTime(t time.Time) time.Time {
+	return time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), timeLocationUTC)
+}
+
+// timeToExcelTime provides function to convert time to Excel time.
+func timeToExcelTime(t time.Time) float64 {
+	return float64(t.UnixNano())/8.64e13 + 25569.0
+}
+
+// shiftJulianToNoon provides function to process julian date to noon.
+func shiftJulianToNoon(julianDays, julianFraction float64) (float64, float64) {
+	switch {
+	case -0.5 < julianFraction && julianFraction < 0.5:
+		julianFraction += 0.5
+	case julianFraction >= 0.5:
+		julianDays++
+		julianFraction -= 0.5
+	case julianFraction <= -0.5:
+		julianDays--
+		julianFraction += 1.5
+	}
+	return julianDays, julianFraction
+}
+
+// fractionOfADay provides function to return the integer values for hour,
+// minutes, seconds and nanoseconds that comprised a given fraction of a day.
+// values would round to 1 us.
+func fractionOfADay(fraction float64) (hours, minutes, seconds, nanoseconds int) {
+
+	const (
+		c1us  = 1e3
+		c1s   = 1e9
+		c1day = 24 * 60 * 60 * c1s
+	)
+
+	frac := int64(c1day*fraction + c1us/2)
+	nanoseconds = int((frac%c1s)/c1us) * c1us
+	frac /= c1s
+	seconds = int(frac % 60)
+	frac /= 60
+	minutes = int(frac % 60)
+	hours = int(frac / 60)
+	return
+}
+
+// julianDateToGregorianTime provides function to convert julian date to
+// gregorian time.
+func julianDateToGregorianTime(part1, part2 float64) time.Time {
+	part1I, part1F := math.Modf(part1)
+	part2I, part2F := math.Modf(part2)
+	julianDays := part1I + part2I
+	julianFraction := part1F + part2F
+	julianDays, julianFraction = shiftJulianToNoon(julianDays, julianFraction)
+	day, month, year := doTheFliegelAndVanFlandernAlgorithm(int(julianDays))
+	hours, minutes, seconds, nanoseconds := fractionOfADay(julianFraction)
+	return time.Date(year, time.Month(month), day, hours, minutes, seconds, nanoseconds, time.UTC)
+}
+
+// By this point generations of programmers have repeated the algorithm sent to
+// the editor of "Communications of the ACM" in 1968 (published in CACM, volume
+// 11, number 10, October 1968, p.657). None of those programmers seems to have
+// found it necessary to explain the constants or variable names set out by
+// Henry F. Fliegel and Thomas C. Van Flandern.  Maybe one day I'll buy that
+// jounal and expand an explanation here - that day is not today.
+func doTheFliegelAndVanFlandernAlgorithm(jd int) (day, month, year int) {
+	l := jd + 68569
+	n := (4 * l) / 146097
+	l = l - (146097*n+3)/4
+	i := (4000 * (l + 1)) / 1461001
+	l = l - (1461*i)/4 + 31
+	j := (80 * l) / 2447
+	d := l - (2447*j)/80
+	l = j / 11
+	m := j + 2 - (12 * l)
+	y := 100*(n-49) + i + l
+	return d, m, y
+}
+
+// timeFromExcelTime provides function to convert an excelTime representation
+// (stored as a floating point number) to a time.Time.
+func timeFromExcelTime(excelTime float64, date1904 bool) time.Time {
+	var date time.Time
+	var intPart = int64(excelTime)
+	// Excel uses Julian dates prior to March 1st 1900, and Gregorian
+	// thereafter.
+	if intPart <= 61 {
+		const OFFSET1900 = 15018.0
+		const OFFSET1904 = 16480.0
+		const MJD0 float64 = 2400000.5
+		var date time.Time
+		if date1904 {
+			date = julianDateToGregorianTime(MJD0, excelTime+OFFSET1904)
+		} else {
+			date = julianDateToGregorianTime(MJD0, excelTime+OFFSET1900)
+		}
+		return date
+	}
+	var floatPart = excelTime - float64(intPart)
+	var dayNanoSeconds float64 = 24 * 60 * 60 * 1000 * 1000 * 1000
+	if date1904 {
+		date = time.Date(1904, 1, 1, 0, 0, 0, 0, time.UTC)
+	} else {
+		date = time.Date(1899, 12, 30, 0, 0, 0, 0, time.UTC)
+	}
+	durationDays := time.Duration(intPart) * time.Hour * 24
+	durationPart := time.Duration(dayNanoSeconds * floatPart)
+	return date.Add(durationDays).Add(durationPart)
+}

excelize.go

@@ -4,11 +4,13 @@ import (
 	"archive/zip"
 	"bytes"
 	"encoding/xml"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
 	"strconv"
 	"strings"
+	"time"
 )
 
 // File define a populated XLSX file struct.
@@ -84,8 +86,13 @@ func (f *File) SetCellValue(sheet, axis string, value interface{}) {
 		f.SetCellStr(sheet, axis, t)
 	case []byte:
 		f.SetCellStr(sheet, axis, string(t))
-	default:
+	case time.Time:
+		f.SetCellDefault(sheet, axis, strconv.FormatFloat(float64(timeToExcelTime(timeToUTCTime(value.(time.Time)))), 'f', -1, 32))
+		f.SetCellStyle(sheet, axis, axis, `{"number_format": 22}`)
+	case nil:
 		f.SetCellStr(sheet, axis, "")
+	default:
+		f.SetCellStr(sheet, axis, fmt.Sprintf("%v", value))
 	}
 }
 

excelize_test.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"strconv"
 	"testing"
+	"time"
 )
 
 func TestOpenFile(t *testing.T) {
@@ -66,6 +67,8 @@ func TestOpenFile(t *testing.T) {
 	xlsx.SetCellValue("Sheet2", "F2", float32(42))
 	xlsx.SetCellValue("Sheet2", "F2", float64(42))
 	xlsx.SetCellValue("Sheet2", "G2", nil)
+	xlsx.SetCellValue("Sheet2", "G3", uint8(8))
+	xlsx.SetCellValue("Sheet2", "G4", time.Now())
 	// Test completion column.
 	xlsx.SetCellValue("Sheet2", "M2", nil)
 	// Test read cell value with given axis large than exists row.
@@ -322,18 +325,40 @@ func TestSetCellStyleBorder(t *testing.T) {
 	}
 }
 
-func TestSetCellStyleFill(t *testing.T) {
+func TestSetCellStyleNumberFormat(t *testing.T) {
 	xlsx, err := OpenFile("./test/Workbook_2.xlsx")
 	if err != nil {
 		t.Log(err)
 	}
-	xlsx.SetCellValue("Sheet1", "N23", 42920.5)
 	// Test only set fill and number format for a cell.
-	err = xlsx.SetCellStyle("Sheet1", "N23", "N23", `{"fill":{"type":"gradient","color":["#FFFFFF","#E0EBF5"],"shading":4},"number_format":22}`)
+	col := []string{"L", "M", "N", "O", "P"}
+	data := []int{0, 1, 2, 3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49}
+	value := []string{"37947.7500001", "-37947.7500001", "0.007", "2.1", "String"}
+	for i, v := range value {
+		for k, d := range data {
+			c := col[i] + strconv.Itoa(k+1)
+			var val float64
+			val, err = strconv.ParseFloat(v, 64)
+			if err != nil {
+				xlsx.SetCellValue("Sheet2", c, v)
+			} else {
+				xlsx.SetCellValue("Sheet2", c, val)
+			}
+			err := xlsx.SetCellStyle("Sheet2", c, c, `{"fill":{"type":"gradient","color":["#FFFFFF","#E0EBF5"],"shading":5},"number_format": `+strconv.Itoa(d)+`}`)
+			if err != nil {
+				t.Log(err)
+			}
+			t.Log(xlsx.GetCellValue("Sheet2", c))
+		}
+	}
+	err = xlsx.Save()
 	if err != nil {
 		t.Log(err)
 	}
-	err = xlsx.SetCellStyle("Sheet1", "N24", "N24", `{"fill":{"type":"gradient","color":["#FFFFFF","#E0EBF5"],"shading":5},"number_format":23}`)
+}
+
+func TestSetCellStyleFill(t *testing.T) {
+	xlsx, err := OpenFile("./test/Workbook_2.xlsx")
 	if err != nil {
 		t.Log(err)
 	}

rows.go

@@ -141,10 +141,10 @@ func (xlsx *xlsxC) getValueFrom(f *File, d *xlsxSST) (string, error) {
 			}
 			return value, nil
 		}
-		return d.SI[xlsxSI].T, nil
+		return f.formattedValue(xlsx.S, d.SI[xlsxSI].T), nil
 	case "str":
-		return xlsx.V, nil
+		return f.formattedValue(xlsx.S, xlsx.V), nil
 	default:
-		return xlsx.V, nil
+		return f.formattedValue(xlsx.S, xlsx.V), nil
 	}
 }