golang 时间戳 时间格式化 获取当前时间 timestamp 计算时间差 |
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获取当前时间
func Now func Now() Time 1Now returns the current local time. func (Time) UTC func (t Time) UTC() Time 1UTC returns t with the location set to UTC. func (Time) Unix func (t Time) Unix() int64 1Unix returns t as a Unix time, the number of seconds elapsed since January 1, 1970 UTC. func (Time) UnixNano func (t Time) UnixNano() int64 1UnixNano 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 main import ( "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 main import ( "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 main import ( "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 1time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0 Date() (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 main import "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 main import ( "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)) } |
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