详解Golang中的各种时间操作

package utils

import "time"

const (
 TIMEFORMAT = "20060102150405"
 NORMALTIMEFORMAT = "2006-01-02 15:04:05"
)

// 当前时间
func GetTime() time.Time{
 return time.Now()
}

// 格式化为:20060102150405
func GetTimeString(t time.Time) string {
 return t.Format(TIMEFORMAT)
}

// 格式化为:2006-01-02 15:04:05
func GetNormalTimeString(t time.Time) string {
 return t.Format(NORMALTIMEFORMAT)
}

// 转为时间戳->秒数
func GetTimeUnix(t time.Time) int64 {
 return t.Unix()
}

// 转为时间戳->毫秒数
func GetTimeMills(t time.Time) int64 {
 return t.UnixNano() / 1e6
}

// 时间戳转时间
func GetTimeByInt(t1 int64) time.Time{
 return time.Unix(t1,0)
}

// 字符串转时间
func GetTimeByString(timestring string) (time.Time,error){
 if timestring == "" {
 return time.Time{},nil
 }
 return time.ParseInLocation(TIMEFORMAT, timestring, time.Local)
}

// 标准字符串转时间
func GetTimeByNormalString(timestring string) (time.Time,error){
 if timestring == "" {
 return time.Time{},nil
 }
 return time.ParseInLocation(NORMALTIMEFORMAT, timestring, time.Local)
}

// 比较两个时间大小
func CompareTime(t1 ,t2 time.Time) bool {
 return t1.Before(t2)
}

// n小时后的时间字符串
func GetNextHourTime(s string, n int64) string {
 t2, _ := time.ParseInLocation(TIMEFORMAT, s, time.Local)
 t1 := t2.Add(time.Hour * time.Duration(n))
 return GetTimeString(t1)
}

// 计算俩个时间差多少小时
func GetHourDiffer(start_time, end_time string) float32 {
 var hour float32
 t1, err := time.ParseInLocation(TIMEFORMAT, start_time, time.Local)
 t2, err := time.ParseInLocation(TIMEFORMAT, end_time, time.Local)
 if err == nil && CompareTime(t1,t2) {
 diff := GetTimeUnix(t2) - GetTimeUnix(t1)
 hour = float32(diff) / 3600
 return hour
 }
 return hour
}

// 判断当前时间是否是整点
func Checkhours() bool {
 _, m, s := GetTime().Clock()
 if m == s && m == 0 && s == 0 {
 return true
 }
 return false
}

// 时间字符串转为标准字符串
func StringToNormalString(t string) string {
 if !(len(TIMEFORMAT) == len(t) || len(SHORTTIMESTRING) == len(t)) {
 return t
 }
 if len(SHORTTIMESTRING) == len(t) {
 t += "000000"
 }
 if len(TIMEFORMAT) == len(t) {
 t1,err:= GetTimeByString(t)
 if err != nil {
 return t
 }
 t = GetTimeString(t1)
 }
 return t
}

  stringToTime, _ := time.Parse("2006-01-02 15:04:05", "2017-12-12 12:00:00")
  beforeOrAfter := stringToTime.After(time.Now())
  if beforeOrAfter == true {
    fmt.Println("2017-12-12 12:00:00在tNow之后!")
  } else {
    fmt.Println("2017-12-12 12:00:00在tNow之前!")
  }

  beginTime :=time.Now()
  time.Sleep(time.Second*1)
  durtime:= time.Since(beginTime)
  fmt.Println("离现在过去了：",durtime)