获取当前时间
func Now
func Now() Time
- 1
Now returns the current local time.
func (Time) UTC
func (t Time) UTC() Time
- 1
UTC returns t with the location set to UTC.
func (Time) Unix
func (t Time) Unix() int64
- 1
Unix returns t as a Unix time, the number of seconds elapsed since January 1, 1970 UTC.
func (Time) UnixNano
func (t Time) UnixNano() int64
- 1
UnixNano returns t as a Unix time, the number of nanoseconds elapsed since January 1, 1970 UTC.
看到Unix和UnixNano的区别了吧，就是精度不同而已：
package mainimport ( "fmt" "strconv" "time" ) func main() { t := time.Now() fmt.Println(t) fmt.Println(t.UTC().Format(time.UnixDate)) fmt.Println(t.Unix()) timestamp := strconv.FormatInt(t.UTC().UnixNano(), 10) fmt.Println(timestamp) timestamp = timestamp[:10] fmt.Println(timestamp) } 输出：
2017-06-21 11:52:29.0826692 +0800 CST Wed Jun 21 03:52:29 UTC 2017 1498017149 1498017149082669200 1498017149时间格式化字符串转换
func Parse
package mainimport ( "fmt" "strconv" "time" ) func main() { const longForm = "Jan 2, 2006 at 3:04pm (MST)" t, _ := time.Parse(longForm, "Jun 21, 2017 at 0:00am (PST)") fmt.Println(t) const shortForm = "2006-Jan-02" t, _ = time.Parse(shortForm, "2017-Jun-21") fmt.Println(t) t, _ = time.Parse("01/02/2006", "06/21/2017") fmt.Println(t) fmt.Println(t.Unix()) i, err := strconv.ParseInt("1498003200", 10, 64) if err != nil { panic(err) } tm := time.Unix(i, 0) fmt.Println(tm) var timestamp int64 = 1498003200 tm2 := time.Unix(timestamp, 0) fmt.Println(tm2.Format("2006-01-02 03:04:05 PM")) fmt.Println(tm2.Format("02/01/2006 15:04:05 PM")) } 输出：
2017-06-21 00:00:00 +0000 PST 2017-06-21 00:00:00 +0000 UTC 2017-06-21 00:00:00 +0000 UTC 1498003200 2017-06-21 08:00:00 +0800 CST 2017-06-21 08:00:00 AM 21/06/2017 08:00:00 AM再看一个例子：
package mainimport ( "fmt" "strings" "time" ) func main() { var dates [4]time.Time dates[0], _ = time.Parse("2006-01-02 15:04:05.000000000 MST -07:00", "1609-09-12 19:02:35.123456789 PDT +03:00") dates[1], _ = time.Parse("2006-01-02 03:04:05 PM -0700", "1995-11-07 04:29:43 AM -0209") dates[2], _ = time.Parse("PM -0700 01/02/2006 03:04:05", "AM -0209 11/07/1995 04:29:43") dates[3], _ = time.Parse("Time:Z07:00T15:04:05 Date:2006-01-02 ", "Time:-03:30T19:18:35 Date:2119-10-29") defaultFormat := "2006-01-02 15:04:05 PM -07:00 Jan Mon MST" formats := []map[string]string{ { "format": "2006", "description": "Year"}, { "format": "06", "description": "Year"}, { "format": "01", "description": "Month"}, { "format": "1", "description": "Month"}, { "format": "Jan", "description": "Month"}, { "format": "January", "description": "Month"}, { "format": "02", "description": "Day"}, { "format": "2", "description": "Day"}, { "format": "Mon", "description": "Week day"}, { "format": "Monday", "description": "Week day"}, { "format": "03", "description": "Hours"}, { "format": "3", "description": "Hours"}, { "format": "15", "description": "Hours"}, { "format": "04", "description": "Minutes"}, { "format": "4", "description": "Minutes"}, { "format": "05", "description": "Seconds"}, { "format": "5", "description": "Seconds"}, { "format": "PM", "description": "AM or PM"}, { "format": ".000", "description": "Miliseconds"}, { "format": ".000000", "description": "Microseconds"}, { "format": ".000000000", "description": "Nanoseconds"}, { "format": "-0700", "description": "Timezone offset"}, { "format": "-07:00", "description": "Timezone offset"}, { "format": "Z0700", "description": "Timezone offset"}, { "format": "Z07:00", "description": "Timezone offset"}, { "format": "MST", "description": "Timezone"}} for _, date := range dates { fmt.Printf("\n\n %s \n", date.Format(defaultFormat)) fmt.Printf("%-15s + %-12s + %12s \n", strings.Repeat("-", 15), strings.Repeat("-", 12), strings.Repeat("-", 12)) fmt.Printf("%-15s | %-12s | %12s \n", "Type", "Placeholder", "Value") fmt.Printf("%-15s + %-12s + %12s \n", strings.Repeat("-", 15), strings.Repeat("-", 12), strings.Repeat("-", 12)) for _, f := range formats { fmt.Printf("%-15s | %-12s | %-12s \n", f["description"], f["format"], date.Format(f["format"])) } fmt.Printf("%-15s + %-12s + %12s \n", strings.Repeat("-", 15), strings.Repeat("-", 12), strings.Repeat("-", 12)) } } time包的一些其他用法
time包很强大，这里不能整个篇幅的进行介绍，可以自己去看官方的文档。
func Date
func Date(year int, month Month, day, hour, min, sec, nsec int, loc *Location) Time
- 1
time常用方法
After(u Time) bool
时间类型比较,是否在Time之后Before(u Time) bool
时间类型比较,是否在Time之前Equal(u Time) bool
比较两个时间是否相等IsZero() bool
判断时间是否为零值,如果sec和nsec两个属性都是0的话,则该时间类型为0Date() (year int, month Month, day int)
返回年月日,三个参数Year() int
返回年份Month() Month
返回月份.是Month类型Day() int
返回多少号Weekday() Weekday
返回星期几,是Weekday类型ISOWeek() (year, week int)
返回年份,和该填是在这年的第几周.Clock() (hour, min, sec int)
返回小时,分钟,秒Hour() int
返回小时Minute() int
返回分钟Second() int
返回秒数Nanosecond() int
返回纳秒应用：
package mainimport "fmt"import "time" func main() { p := fmt.Println now := time.Now() p(now) then := time.Date( 2017, 06, 21, 20, 34, 58, 0, time.UTC) p(then) p(then.Year()) p(then.Month()) p(then.Day()) p(then.Hour()) p(then.Minute()) p(then.Second()) p(then.Nanosecond()) p(then.Location()) p(then.Weekday()) p(then.Before(now)) p(then.After(now)) p(then.Equal(now)) diff := now.Sub(then) p(diff) p(diff.Hours()) p(diff.Minutes()) p(diff.Seconds()) p(diff.Nanoseconds()) p(then.Add(diff)) p(then.Add(-diff)) } 输出：
2017-06-21 13:22:36.5138633 +0800 CST 2017-06-21 20:34:58 +0000 UTC 2017 June 21 20 34 58 0 UTC Wednesday false true false -15h12m21.4861367s -15.205968371305556 -912.3581022783334 -54741.4861367 -54741486136700 2017-06-21 05:22:36.5138633 +0000 UTC 2017-06-22 11:47:19.4861367 +0000 UTC
计算时间差 /
package mainimport ( "fmt" "strings" "time")func main() { // Add 时间相加 now := time.Now() // ParseDuration parses a duration string. // A duration string is a possibly signed sequence of decimal numbers, // each with optional fraction and a unit suffix, // such as "300ms", "-1.5h" or "2h45m". // Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h". // 10分钟前 m, _ := time.ParseDuration("-1m") m1 := now.Add(m) fmt.Println(m1) // 8个小时前 h, _ := time.ParseDuration("-1h") h1 := now.Add(8 * h) fmt.Println(h1) // 一天前 d, _ := time.ParseDuration("-24h") d1 := now.Add(d) fmt.Println(d1) printSplit(50) // 10分钟后 mm, _ := time.ParseDuration("1m") mm1 := now.Add(mm) fmt.Println(mm1) // 8小时后 hh, _ := time.ParseDuration("1h") hh1 := now.Add(hh) fmt.Println(hh1) // 一天后 dd, _ := time.ParseDuration("24h") dd1 := now.Add(dd) fmt.Println(dd1) printSplit(50) // Sub 计算两个时间差 subM := now.Sub(m1) fmt.Println(subM.Minutes(), "分钟") sumH := now.Sub(h1) fmt.Println(sumH.Hours(), "小时") sumD := now.Sub(d1) fmt.Printf("%v 天\n", sumD.Hours()/24)}func printSplit(count int) { fmt.Println(strings.Repeat("#", count))}