This closes #1107, stream writer will create a time number format for time type cells

Unit test coverage improved

cell.go

@@ -228,8 +228,7 @@ func setCellTime(value time.Time) (t string, b string, isNum bool, err error) {
 	var excelTime float64
 	_, offset := value.In(value.Location()).Zone()
 	value = value.Add(time.Duration(offset) * time.Second)
-	excelTime, err = timeToExcelTime(value)
-	if err != nil {
+	if excelTime, err = timeToExcelTime(value); err != nil {
 		return
 	}
 	isNum = excelTime > 0
@@ -419,8 +418,7 @@ func setCellStr(value string) (t string, v string, ns xml.Attr) {
 			}
 		}
 	}
-	t = "str"
-	v = bstrMarshal(value)
+	t, v = "str", bstrMarshal(value)
 	return
 }
 

stream.go

@@ -341,7 +341,7 @@ func (sw *StreamWriter) SetRow(axis string, values []interface{}, opts ...RowOpt
 			val = v.Value
 			setCellFormula(&c, v.Formula)
 		}
-		if err = setCellValFunc(&c, val); err != nil {
+		if err = sw.setCellValFunc(&c, val); err != nil {
 			_, _ = sw.rawData.WriteString(`</row>`)
 			return err
 		}
@@ -424,7 +424,7 @@ func setCellFormula(c *xlsxC, formula string) {
 }
 
 // setCellValFunc provides a function to set value of a cell.
-func setCellValFunc(c *xlsxC, val interface{}) (err error) {
+func (sw *StreamWriter) setCellValFunc(c *xlsxC, val interface{}) (err error) {
 	switch val := val.(type) {
 	case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
 		err = setCellIntFunc(c, val)
@@ -439,7 +439,12 @@ func setCellValFunc(c *xlsxC, val interface{}) (err error) {
 	case time.Duration:
 		c.T, c.V = setCellDuration(val)
 	case time.Time:
-		c.T, c.V, _, err = setCellTime(val)
+		var isNum bool
+		c.T, c.V, isNum, err = setCellTime(val)
+		if isNum && c.S == 0 {
+			style, _ := sw.File.NewStyle(&Style{NumFmt: 22})
+			c.S = style
+		}
 	case bool:
 		c.T, c.V = setCellBool(val)
 	case nil:

stream_test.go

@@ -58,7 +58,7 @@ func TestStreamWriter(t *testing.T) {
 	assert.NoError(t, streamWriter.SetRow("A4", []interface{}{Cell{StyleID: styleID}, Cell{Formula: "SUM(A10,B10)"}}), RowOpts{Height: 45, StyleID: styleID})
 	assert.NoError(t, streamWriter.SetRow("A5", []interface{}{&Cell{StyleID: styleID, Value: "cell"}, &Cell{Formula: "SUM(A10,B10)"}}))
 	assert.NoError(t, streamWriter.SetRow("A6", []interface{}{time.Now()}))
-	assert.NoError(t, streamWriter.SetRow("A7", nil, RowOpts{Hidden: true}))
+	assert.NoError(t, streamWriter.SetRow("A7", nil, RowOpts{Height: 20, Hidden: true, StyleID: styleID}))
 	assert.EqualError(t, streamWriter.SetRow("A7", nil, RowOpts{Height: MaxRowHeight + 1}), ErrMaxRowHeight.Error())
 
 	for rowID := 10; rowID <= 51200; rowID++ {
@@ -208,24 +208,27 @@ func TestSetRow(t *testing.T) {
 }
 
 func TestSetCellValFunc(t *testing.T) {
+	f := NewFile()
+	sw, err := f.NewStreamWriter("Sheet1")
+	assert.NoError(t, err)
 	c := &xlsxC{}
-	assert.NoError(t, setCellValFunc(c, 128))
-	assert.NoError(t, setCellValFunc(c, int8(-128)))
-	assert.NoError(t, setCellValFunc(c, int16(-32768)))
-	assert.NoError(t, setCellValFunc(c, int32(-2147483648)))
-	assert.NoError(t, setCellValFunc(c, int64(-9223372036854775808)))
-	assert.NoError(t, setCellValFunc(c, uint(128)))
-	assert.NoError(t, setCellValFunc(c, uint8(255)))
-	assert.NoError(t, setCellValFunc(c, uint16(65535)))
-	assert.NoError(t, setCellValFunc(c, uint32(4294967295)))
-	assert.NoError(t, setCellValFunc(c, uint64(18446744073709551615)))
-	assert.NoError(t, setCellValFunc(c, float32(100.1588)))
-	assert.NoError(t, setCellValFunc(c, float64(100.1588)))
-	assert.NoError(t, setCellValFunc(c, " Hello"))
-	assert.NoError(t, setCellValFunc(c, []byte(" Hello")))
-	assert.NoError(t, setCellValFunc(c, time.Now().UTC()))
-	assert.NoError(t, setCellValFunc(c, time.Duration(1e13)))
-	assert.NoError(t, setCellValFunc(c, true))
-	assert.NoError(t, setCellValFunc(c, nil))
-	assert.NoError(t, setCellValFunc(c, complex64(5+10i)))
+	assert.NoError(t, sw.setCellValFunc(c, 128))
+	assert.NoError(t, sw.setCellValFunc(c, int8(-128)))
+	assert.NoError(t, sw.setCellValFunc(c, int16(-32768)))
+	assert.NoError(t, sw.setCellValFunc(c, int32(-2147483648)))
+	assert.NoError(t, sw.setCellValFunc(c, int64(-9223372036854775808)))
+	assert.NoError(t, sw.setCellValFunc(c, uint(128)))
+	assert.NoError(t, sw.setCellValFunc(c, uint8(255)))
+	assert.NoError(t, sw.setCellValFunc(c, uint16(65535)))
+	assert.NoError(t, sw.setCellValFunc(c, uint32(4294967295)))
+	assert.NoError(t, sw.setCellValFunc(c, uint64(18446744073709551615)))
+	assert.NoError(t, sw.setCellValFunc(c, float32(100.1588)))
+	assert.NoError(t, sw.setCellValFunc(c, float64(100.1588)))
+	assert.NoError(t, sw.setCellValFunc(c, " Hello"))
+	assert.NoError(t, sw.setCellValFunc(c, []byte(" Hello")))
+	assert.NoError(t, sw.setCellValFunc(c, time.Now().UTC()))
+	assert.NoError(t, sw.setCellValFunc(c, time.Duration(1e13)))
+	assert.NoError(t, sw.setCellValFunc(c, true))
+	assert.NoError(t, sw.setCellValFunc(c, nil))
+	assert.NoError(t, sw.setCellValFunc(c, complex64(5+10i)))
 }