Generating big tables with time cells results with corrupted file

[ludmanp]

Description

Generating big table with time columns output file is corrupted.

Steps to reproduce the issue:
here is example script
`package main

import (
"flag"
"fmt"
"github.com/360EntSecGroup-Skylar/excelize"
"math/rand"
"reflect"
"strconv"
"time"
)

type NullTime struct {
Time time.Time
Valid bool // Valid is true if Time is not NULL
}

func main() {
r := rand.New(rand.NewSource(99))

excel := excelize.NewFile()

sheetName := "Test sheet"
sheetIndex := excel.GetActiveSheetIndex()
excel.SetSheetName(excel.GetSheetName(sheetIndex), sheetName)

dateStyle, _ := excel.NewStyle(`{"custom_number_format": "yyyy-mm-dd"}`)
floatStyle, _ := excel.NewStyle(`{"number_format": 2}`)

rowsCount := flag.Int("rows", 100, "Number of rows")
flag.Parse()
for row := 1; row <= *rowsCount; row++ {
	for col := 1; col <= 10; col++ {
		val := randate()
		t := reflect.ValueOf(val)
		_ = excel.SetCellValue(sheetName, intToCharIndex(col)+strconv.Itoa(row), t.Interface())
		_ = excel.SetCellStyle(sheetName, intToCharIndex(col)+strconv.Itoa(row), intToCharIndex(col)+strconv.Itoa(row), dateStyle)
	}
	for col := 11; col <= 101; col++ {
		_ = excel.SetCellValue(sheetName, intToCharIndex(col)+strconv.Itoa(row), r.Float64())
		_ = excel.SetCellStyle(sheetName, intToCharIndex(col)+strconv.Itoa(row), intToCharIndex(col)+strconv.Itoa(row), floatStyle)
	}
}
if err := excel.SaveAs("Test.xlsx"); err != nil {
	fmt.Println(err)
}

}

func intToCharIndex(i int) string {
col, _ := excelize.ColumnNumberToName(i+1)
return col
}

func randate() time.Time {
min := time.Date(2010, 1, 0, 0, 0, 0, 0, time.UTC).Unix()
max := time.Date(2020, 1, 0, 0, 0, 0, 0, time.UTC).Unix()
delta := max - min

sec := rand.Int63n(delta) + min
return time.Unix(sec, 0).UTC()

}

`

making some 100 or 1000 rows output file is ok, making 10k rows file is corrupted.

Describe the results you received:

Describe the results you expected:

Output of go version:

go version go1.14.2 darwin/amd64

Excelize version or commit ID:

v2.2.0

Environment details (OS, Microsoft Excel™ version, physical, etc.):

macOS Catalina, MS Excel for Mac 16.37

[xuri]

Thanks for your issue. I have fixed it. Please try to upgrade the library with the master branch code.

[ludmanp]

Great, thank you for fast reaction.