golang timestamp

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package mmtime

import (
   "fmt"
   "strconv"
   "time"
)

// FMT_TYPE_NOMAL
const (
   DATE_TIME_FMT = "2006-01-02 15:04:05"

   DATE_FMT = "2006-01-02"

   TIME_FMT = "15:04:05"

   DATE_TIME_FMT_CN = "2006年01月02日 15时04分05秒"

   DATE_FMT_CN = "2006年01月02日"

   TIME_FMT_CN = "15时04分05秒"
)

const SecondInNano = 1000 * 1000 * 1000

//return 1441006057 in sec
func GetTimestamp() int64 {
   return time.Now().Unix()
}

//return 1441006057 in sec
func GetTimestampString() string {
   return strconv.FormatInt(GetTimestamp(), 10)
}

// return 1441007112776 in millisecond
func GetTimestampInMilli() int64 {
   return int64(time.Now().UnixNano() / (1000 * 1000)) // ms
}

// return 1441007112776 in millisecond
func GetTimestampInMilliString() string {
   return strconv.FormatInt(GetTimestampInMilli(), 10)
}

//微秒
func GetTimestampInMicro() int64 {
   return int64(time.Now().UnixNano() / 1000) // ms
}
// 微秒
func GetTimestampInMicroString() {
   return strconv.FormatInt(GetTimestampInMicro(), 10)
}


//format
func GetCurrentTimeFormat(format string) string {
   return GetTimeFormat(GetTimestamp(), format)
}

//
func GetTimeFormat(second int64, format string) string {
   return time.Unix(second, 0).Format(format)
}

// Timing the cost of function call, unix nano was returned
func Elapse(f func()) int64 {
   now := time.Now().UnixNano()
   f()
   return time.Now().UnixNano() - now
}

// Timing the cost of function call, unix nano was returned
func ElapseString(f func()) string {
   return strconv.FormatInt(Elapse(f), 10)
}

// GetMonthDays return days of the month/year
func GetMonthDays(year, month int) int {
   switch month {
   case 1, 3, 5, 7, 8, 10, 12:
      return 31
   case 4, 6, 9, 11:
      return 30
   case 2:
      if IsLeapYear(year) {
         return 29
      }
      return 28
   default:
      panic(fmt.Sprintf("Illegal month:%d", month))
   }
}

// IsLeapYear check whether a year is leay
func IsLeapYear(year int) bool {
   if year%100 == 0 {
      return year%400 == 0
   }

   return year%4 == 0
}