GO中的時間操作總結(jié)(time&dateparse)
〇、前言
日常開發(fā)過程中,對于時間的操作可謂是無處不在,但是想實現(xiàn)時間自由還是不簡單的,多種時間格式容易混淆,那么本文將進行梳理,一起學(xué)習(xí)下。
官方提供的庫是 time,功能很全面,本文也會詳細(xì)介紹。
還有另外一個開源庫 dateparse,使用起來比較方便,本文也會將加入示例測試出結(jié)果,以展示其優(yōu)點。
一、time 庫
1.1 Time 類型的結(jié)構(gòu)
go 通過time.Now()
來取當(dāng)前時間,打印出來如下:
2023-09-15 17:59:14.2642387 +0800 CST m=+0.010202701
這里存在兩個疑點:1)表示秒級的數(shù)值為什么默認(rèn)為 7 位? 2)最后邊的 m=... 代表什么?
1)對于時間戳來說,一般采用秒級或毫秒級。采用浮點數(shù)或定點數(shù)來表示小數(shù)部分,需要一定的字節(jié)數(shù)來存儲,而為了在大多數(shù)應(yīng)用場景下滿足足夠的精度,一般會選擇使用7位數(shù)字來表示毫秒級的小數(shù)部分,從而達(dá)到既滿足絕大多數(shù)需求又占用盡量上的存儲。
2)m 就是 Monotonic Clocks,意思是單調(diào)時間的,所謂單調(diào),就是只會不停的往前增長,不受校時操作的影響,這個時間是自進程啟動以來的秒數(shù)。
在 go1.9 之后,結(jié)構(gòu)更新為:
type Time struct { wall uint64 ext int64 loc *Location }
Time 結(jié)構(gòu)體中由三部分組成,loc 比較明了,表示時區(qū),wall 和 ext 所存儲的信息規(guī)則相對復(fù)雜,根據(jù)文檔的介紹總結(jié)成了下圖:
golang 中的 Time 結(jié)構(gòu),不像很多語言保存 Unix 時間戳(也就是最早只能表示到 1970 年 1 月 1 日),而是至少可以安全的表示 1885 年以來的時間。
下面來取當(dāng)前時間測試下:
package main import ( "encoding/json" "fmt" "time" ) func main() { now := time.Now() // 取當(dāng)前時間 time_now := now fmt.Println(time_now) for i := 0; i < 5; i++ { // 循環(huán) 0~4 共 5 此 time_now = time_now.Add(1 * time.Second) // 每次加 1 秒 fmt.Println(time_now) } encodeNow, _ := json.Marshal(now) // 轉(zhuǎn) json 編碼 decodeNow := time.Time{} json.Unmarshal(encodeNow, &decodeNow) // 將 json 編碼轉(zhuǎn)回 Time fmt.Println(decodeNow) equal_r := now.Equal(decodeNow) fmt.Println(equal_r) }
結(jié)果如下,可見循環(huán)了五次,每次 m 的值都加 1,json 編碼轉(zhuǎn)換后的時間中 m 參數(shù)消失:
1.2 獲取當(dāng)前時間與格式化
1.2.1 取當(dāng)前時間
回去當(dāng)前時間的方法很簡單:
now := time.Now() fmt.Println(now) // 2023-09-18 13:51:40.8480546 +0800 CST m=+0.008992401 fmt.Println(now.String()) // 2023-09-18 13:51:40.8480546 +0800 CST m=+0.008992401
1.2.2 時間格式化
Go 語言提供了時間類型格式化函數(shù) Format(),需要注意的是 Go 語言格式化時間模板不是常見的 Y-m-d H:i:s,而是 2006-01-02 15:04:05,也很好記憶(2006 1 2 3 4 5)。
func (t Time) Format(layout string) string { }
time 庫中,定義了年、月、日、時、分、秒、周、時區(qū)的多種表現(xiàn)形式,如下:
- 年: 06/2006
- 月: 1/01/Jan/January
- 日: 2/02/_2
- 時: 3/03/15/PM/pm/AM/am
- 分: 4/04
- 秒: 5/05
- 周: Mon/Monday
- 時區(qū):-07/-0700/Z0700/Z07:00/-07:00/MST
這些格式的形式配置,可以根據(jù)自己的需求自由組合,一下是部分組合的測試:
package main import ( "fmt" "time" ) func main() { now := time.Now() fmt.Println(now) fmt.Println("2006-01-02 15:04:05 output:", now.Format("2006-01-02 15:04:05")) fmt.Println("2006-01-02 output:", now.Format("2006-01-02")) fmt.Println("01-02-2006 output:", now.Format("01-02-2006")) fmt.Println("15:03:04 output:", now.Format("15:03:04")) fmt.Println("2006/01/02 15:04 output:", now.Format("2006/01/02 15:04")) fmt.Println("15:04 2006/01/02 output:", now.Format("15:04 2006/01/02")) fmt.Println("2006#01#02 output:", now.Format("2006#01#02")) fmt.Println("2006$01$02 output:", now.Format("2006$01$02")) fmt.Println("2006-01-02 15:04:05.000 output:", now.Format("2006-01-02 15:04:05.000")) fmt.Println("2006-01-02 15:04:05.000000000 output:", now.Format("2006-01-02 15:04:05.000000000")) fmt.Println("2006-January-02 15:04:05 Monday output:", now.Format("2006-January-02 15:04:05 Monday")) fmt.Println("2006-Jan-02 15:04:05 Mon output:", now.Format("2006-Jan-02 15:04:05 Mon")) fmt.Println("2006-1-2 3:4:5 PM output:", now.Format("2006-1-2 3:4:5 PM")) }
字符串類型的日期轉(zhuǎn) Time:
package main import ( "fmt" "time" ) func main() { t, _ := time.ParseInLocation("2006-01-02", "2023-09-18", time.Local) // time.Local 指定本地時間 fmt.Println(t) t, _ = time.ParseInLocation("2006-01-02 15:04:05", "2023-09-18 17:46:13", time.Local) fmt.Println(t) t, _ = time.ParseInLocation("2006-01-02 15:04:05", "2023-09-18", time.Local) fmt.Println(t) // 當(dāng)時間字符串和標(biāo)準(zhǔn)字符串不統(tǒng)一時,轉(zhuǎn)化失敗 }
1.2.3 取日期的單個值
日期的組成部分比較多,下面來嘗試取出各個部分的值:
package main import ( "fmt" "time" ) func main() { now := time.Now() // 返回日期 year, month, day := now.Date() fmt.Printf("日期:%d年%d月%d日\n", year, month, day) fmt.Println("年:", now.Year()) // int fmt.Println("月:", now.Month()) // time.Month fmt.Println("月:", now.Month().String()) fmt.Println("月:", int(now.Month())) fmt.Println("日:", now.Day()) // int // 時分秒 hour, minute, second := now.Clock() fmt.Printf("時間:%d:%d:%d\n", hour, minute, second) fmt.Println("時:", now.Hour()) // int fmt.Println("分:", now.Minute()) // int fmt.Println("秒:", now.Second()) // int fmt.Println("星期:", now.Weekday()) // time.Weekday fmt.Println("星期:", now.Weekday().String()) // 不能得到 一、二。。。 fmt.Println("星期:", int(now.Weekday())) // 可以通過取得的 1、2。。。來計算是周幾 fmt.Println("天數(shù):", now.YearDay()) // int fmt.Println("時區(qū):", now.Location()) }
1.3 日期的計算
計算之前或之后一段時間:
package main import ( "fmt" "time" ) func main() { now := time.Now() fmt.Println(now, "(當(dāng)前時間)") // func (t Time) AddDate(years int, months int, days int) Time m0 := now.AddDate(1, 1, 1) fmt.Println(m0, "(now.AddDate(1,1,1))") m00 := now.AddDate(0, 1, 1) fmt.Println(m00, "(now.AddDate(0,1,1))") // func ParseDuration(s string) (Duration, error) // s string:"ns", "us" (or "μs"), "ms", "s", "m", "h" t1, _ := time.ParseDuration("1h1m1s") // 亦可:48h1m1s m1 := now.Add(t1) fmt.Println(m1, "(1小時1分1s之后)") t2, _ := time.ParseDuration("-1h1m1s") m2 := now.Add(t2) fmt.Println(m2, "(1小時1分1s之前)") t3, _ := time.ParseDuration("-1h") m3 := now.Add(t3 * 3) fmt.Println(m3, "(3小時之前)") }
時間差和比較時間大?。?/strong>
package main import ( "fmt" "time" ) func main() { now := time.Now() fmt.Println(now, "(當(dāng)前時間)") // func (t Time) Sub(u Time) Duration // 取時間差對象 sub1 := now.Sub(m1) fmt.Println(sub1.Hours(), "(相差小時數(shù))") fmt.Println(sub1.Minutes(), "(相差分鐘數(shù))") // time.Since(t Time) Duration // 返回當(dāng)前時間與 t 的時間差,返回值是 Duration // time.Until(t Time) Duration // 返回 t 與當(dāng)前時間的時間差,返回值是 Duration t1s, _ := time.ParseDuration("-1h") m1s := now.Add(t1s) fmt.Println(time.Since(m1s), "(Since)") fmt.Println(time.Until(m1s), "(Until)") // func (t Time) Before(u Time) bool // 如果 t 代表的時間點在 u 之前,返回真;否則返回假 // func (t Time) After(u Time) bool // 如果 t 代表的時間點在 u 之后,返回真;否則返回假 // func (t Time) Equal(u Time) bool // 比較時間是否相等,相等返回真;否則返回假 t1m, _ := time.ParseDuration("1h") m1m := now.Add(t1m) fmt.Println(m1m) fmt.Println(m1m.After(now), "(After(now))") fmt.Println(m1m.Before(now), "(Before(now))") fmt.Println(now.Equal(m1m), "(Equal(m1m))") }
1.4 時間戳
如何取時間戳:
package main import ( "fmt" "time" ) func main() { now := time.Now() fmt.Println(now, "(當(dāng)前時間)") // 取時間戳 fmt.Println(now.Unix()) // 當(dāng)前時間戳 fmt.Println(now.UnixMilli()) // 毫秒級時間戳 fmt.Println(now.UnixMicro()) // 微秒級時間戳 fmt.Println(now.UnixNano()) // 納秒級時間戳 fmt.Println(now.Nanosecond()) // 時間戳小數(shù)部分 單位:納秒 }
時間戳與時間的簡單轉(zhuǎn)換:
package main import ( "fmt" "time" ) func main() { now := time.Now() fmt.Println(now, "(當(dāng)前時間)") unix := now.Unix() fmt.Println(unix, "(秒級時間戳)") t := time.Unix(unix, 0) fmt.Println(t, "(原時間)") t = time.Unix(unix, 1) // 在時間戳的基礎(chǔ)上,加 1 納秒 fmt.Println(t, "(加 1 納秒)") micro_unix := now.UnixMicro() fmt.Println(micro_unix, "(微秒級時間戳)") t1 := time.UnixMicro(micro_unix) fmt.Println(t1) }
參考:
一文帶你理解Golang中的Time結(jié)構(gòu)
二、dateparse 庫
dateparse 庫的作用主要就是將不同格式的字符串類型的時間,轉(zhuǎn)為 Time 時間類型。源碼地址:https://github.com/araddon/dateparse
根據(jù)本文 1.2.2 章節(jié)中第二部分 的轉(zhuǎn)換方法,并不能用于全部字符串日期的轉(zhuǎn)換,容易出現(xiàn)轉(zhuǎn)換失敗的情況。另外需要根據(jù)源日期的格式組織標(biāo)準(zhǔn)日期的格式,也會增加工作量。但是,當(dāng)用上 dateparse 庫后,這一切將變的非常簡單。
dateparse 庫,就是將各種類型的日期格式字符串,轉(zhuǎn)換成同樣的格式,參考:2006-01-02 15:04:05 +0000 UTC。
具體引用的方法是func ParseLocal(datestr string, opts ...ParserOption) (time.Time, error){ }
,調(diào)用示例為Time_date_output := dateparse.ParseLocal(str_date_input)
。
以下代碼是 github 上源碼中的示例,供參考:
package main import ( "flag" "fmt" "time" "github.com/scylladb/termtables" "github.com/araddon/dateparse" ) var examples = []string{ "May 8, 2009 5:57:51 PM", "oct 7, 1970", "oct 7, '70", ... } var ( timezone = "" ) func main() { flag.StringVar(&timezone, "timezone", "UTC", "Timezone aka `America/Los_Angeles` formatted time-zone") flag.Parse() // 取命令行參數(shù) timezone if timezone != "" { loc, err := time.LoadLocation(timezone) if err != nil { panic(err.Error()) } time.Local = loc // 將默認(rèn)的本地值修改為輸入的本地參數(shù) } table := termtables.CreateTable() table.AddHeaders("Input", "Parsed, and Output as %v") for _, dateExample := range examples { // 循環(huán)全部日期格式字符串,并輸出轉(zhuǎn)換后的格式 t, err := dateparse.ParseLocal(dateExample) if err != nil { panic(err.Error()) } table.AddRow(dateExample, fmt.Sprintf("%v", t)) } fmt.Println(table.Render()) } /* +-------------------------------------------------------+-----------------------------------------+ | Input | Parsed, and Output as %v | +-------------------------------------------------------+-----------------------------------------+ | May 8, 2009 5:57:51 PM | 2009-05-08 17:57:51 +0000 UTC | | oct 7, 1970 | 1970-10-07 00:00:00 +0000 UTC | | oct 7, '70 | 1970-10-07 00:00:00 +0000 UTC | | oct. 7, 1970 | 1970-10-07 00:00:00 +0000 UTC | | oct. 7, 70 | 1970-10-07 00:00:00 +0000 UTC | | Mon Jan 2 15:04:05 2006 | 2006-01-02 15:04:05 +0000 UTC | | Mon Jan 2 15:04:05 MST 2006 | 2006-01-02 15:04:05 +0000 MST | | Mon Jan 02 15:04:05 -0700 2006 | 2006-01-02 15:04:05 -0700 -0700 | | Monday, 02-Jan-06 15:04:05 MST | 2006-01-02 15:04:05 +0000 MST | | Mon, 02 Jan 2006 15:04:05 MST | 2006-01-02 15:04:05 +0000 MST | | Tue, 11 Jul 2017 16:28:13 +0200 (CEST) | 2017-07-11 16:28:13 +0200 +0200 | | Mon, 02 Jan 2006 15:04:05 -0700 | 2006-01-02 15:04:05 -0700 -0700 | | Mon 30 Sep 2018 09:09:09 PM UTC | 2018-09-30 21:09:09 +0000 UTC | | Mon Aug 10 15:44:11 UTC+0100 2015 | 2015-08-10 15:44:11 +0000 UTC | | Thu, 4 Jan 2018 17:53:36 +0000 | 2018-01-04 17:53:36 +0000 UTC | | Fri Jul 03 2015 18:04:07 GMT+0100 (GMT Daylight Time) | 2015-07-03 18:04:07 +0100 GMT | | Sun, 3 Jan 2021 00:12:23 +0800 (GMT+08:00) | 2021-01-03 00:12:23 +0800 +0800 | | September 17, 2012 10:09am | 2012-09-17 10:09:00 +0000 UTC | | September 17, 2012 at 10:09am PST-08 | 2012-09-17 10:09:00 -0800 PST | | September 17, 2012, 10:10:09 | 2012-09-17 10:10:09 +0000 UTC | | October 7, 1970 | 1970-10-07 00:00:00 +0000 UTC | | October 7th, 1970 | 1970-10-07 00:00:00 +0000 UTC | | 12 Feb 2006, 19:17 | 2006-02-12 19:17:00 +0000 UTC | | 12 Feb 2006 19:17 | 2006-02-12 19:17:00 +0000 UTC | | 14 May 2019 19:11:40.164 | 2019-05-14 19:11:40.164 +0000 UTC | | 7 oct 70 | 1970-10-07 00:00:00 +0000 UTC | | 7 oct 1970 | 1970-10-07 00:00:00 +0000 UTC | | 03 February 2013 | 2013-02-03 00:00:00 +0000 UTC | | 1 July 2013 | 2013-07-01 00:00:00 +0000 UTC | | 2013-Feb-03 | 2013-02-03 00:00:00 +0000 UTC | | 06/Jan/2008:15:04:05 -0700 | 2008-01-06 15:04:05 -0700 -0700 | | 06/Jan/2008 15:04:05 -0700 | 2008-01-06 15:04:05 -0700 -0700 | | 3/31/2014 | 2014-03-31 00:00:00 +0000 UTC | | 03/31/2014 | 2014-03-31 00:00:00 +0000 UTC | | 08/21/71 | 1971-08-21 00:00:00 +0000 UTC | | 8/1/71 | 1971-08-01 00:00:00 +0000 UTC | | 4/8/2014 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 04/08/2014 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 4/8/14 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 04/2/2014 03:00:51 | 2014-04-02 03:00:51 +0000 UTC | | 8/8/1965 12:00:00 AM | 1965-08-08 00:00:00 +0000 UTC | | 8/8/1965 01:00:01 PM | 1965-08-08 13:00:01 +0000 UTC | | 8/8/1965 01:00 PM | 1965-08-08 13:00:00 +0000 UTC | | 8/8/1965 1:00 PM | 1965-08-08 13:00:00 +0000 UTC | | 8/8/1965 12:00 AM | 1965-08-08 00:00:00 +0000 UTC | | 4/02/2014 03:00:51 | 2014-04-02 03:00:51 +0000 UTC | | 03/19/2012 10:11:59 | 2012-03-19 10:11:59 +0000 UTC | | 03/19/2012 10:11:59.3186369 | 2012-03-19 10:11:59.3186369 +0000 UTC | | 2014/3/31 | 2014-03-31 00:00:00 +0000 UTC | | 2014/03/31 | 2014-03-31 00:00:00 +0000 UTC | | 2014/4/8 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 2014/04/08 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 2014/04/2 03:00:51 | 2014-04-02 03:00:51 +0000 UTC | | 2014/4/02 03:00:51 | 2014-04-02 03:00:51 +0000 UTC | | 2012/03/19 10:11:59 | 2012-03-19 10:11:59 +0000 UTC | | 2012/03/19 10:11:59.3186369 | 2012-03-19 10:11:59.3186369 +0000 UTC | | 2014:3:31 | 2014-03-31 00:00:00 +0000 UTC | | 2014:03:31 | 2014-03-31 00:00:00 +0000 UTC | | 2014:4:8 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 2014:04:08 22:05 | 2014-04-08 22:05:00 +0000 UTC | | 2014:04:2 03:00:51 | 2014-04-02 03:00:51 +0000 UTC | | 2014:4:02 03:00:51 | 2014-04-02 03:00:51 +0000 UTC | | 2012:03:19 10:11:59 | 2012-03-19 10:11:59 +0000 UTC | | 2012:03:19 10:11:59.3186369 | 2012-03-19 10:11:59.3186369 +0000 UTC | | 2014年04月08日 | 2014-04-08 00:00:00 +0000 UTC | | 2006-01-02T15:04:05+0000 | 2006-01-02 15:04:05 +0000 UTC | | 2009-08-12T22:15:09-07:00 | 2009-08-12 22:15:09 -0700 -0700 | | 2009-08-12T22:15:09 | 2009-08-12 22:15:09 +0000 UTC | | 2009-08-12T22:15:09.988 | 2009-08-12 22:15:09.988 +0000 UTC | | 2009-08-12T22:15:09Z | 2009-08-12 22:15:09 +0000 UTC | | 2017-07-19T03:21:51:897+0100 | 2017-07-19 03:21:51.897 +0100 +0100 | | 2019-05-29T08:41-04 | 2019-05-29 08:41:00 -0400 -0400 | | 2014-04-26 17:24:37.3186369 | 2014-04-26 17:24:37.3186369 +0000 UTC | | 2012-08-03 18:31:59.257000000 | 2012-08-03 18:31:59.257 +0000 UTC | | 2014-04-26 17:24:37.123 | 2014-04-26 17:24:37.123 +0000 UTC | | 2013-04-01 22:43 | 2013-04-01 22:43:00 +0000 UTC | | 2013-04-01 22:43:22 | 2013-04-01 22:43:22 +0000 UTC | | 2014-12-16 06:20:00 UTC | 2014-12-16 06:20:00 +0000 UTC | | 2014-12-16 06:20:00 GMT | 2014-12-16 06:20:00 +0000 UTC | | 2014-04-26 05:24:37 PM | 2014-04-26 17:24:37 +0000 UTC | | 2014-04-26 13:13:43 +0800 | 2014-04-26 13:13:43 +0800 +0800 | | 2014-04-26 13:13:43 +0800 +08 | 2014-04-26 13:13:43 +0800 +0800 | | 2014-04-26 13:13:44 +09:00 | 2014-04-26 13:13:44 +0900 +0900 | | 2012-08-03 18:31:59.257000000 +0000 UTC | 2012-08-03 18:31:59.257 +0000 UTC | | 2015-09-30 18:48:56.35272715 +0000 UTC | 2015-09-30 18:48:56.35272715 +0000 UTC | | 2015-02-18 00:12:00 +0000 GMT | 2015-02-18 00:12:00 +0000 UTC | | 2015-02-18 00:12:00 +0000 UTC | 2015-02-18 00:12:00 +0000 UTC | | 2015-02-08 03:02:00 +0300 MSK m=+0.000000001 | 2015-02-08 03:02:00 +0300 +0300 | | 2015-02-08 03:02:00.001 +0300 MSK m=+0.000000001 | 2015-02-08 03:02:00.001 +0300 +0300 | | 2017-07-19 03:21:51+00:00 | 2017-07-19 03:21:51 +0000 UTC | | 2014-04-26 | 2014-04-26 00:00:00 +0000 UTC | | 2014-04 | 2014-04-01 00:00:00 +0000 UTC | | 2014 | 2014-01-01 00:00:00 +0000 UTC | | 2014-05-11 08:20:13,787 | 2014-05-11 08:20:13.787 +0000 UTC | | 2020-07-20+08:00 | 2020-07-20 00:00:00 +0800 +0800 | | 3.31.2014 | 2014-03-31 00:00:00 +0000 UTC | | 03.31.2014 | 2014-03-31 00:00:00 +0000 UTC | | 08.21.71 | 1971-08-21 00:00:00 +0000 UTC | | 2014.03 | 2014-03-01 00:00:00 +0000 UTC | | 2014.03.30 | 2014-03-30 00:00:00 +0000 UTC | | 20140601 | 2014-06-01 00:00:00 +0000 UTC | | 20140722105203 | 2014-07-22 10:52:03 +0000 UTC | | 171113 14:14:20 | 2017-11-13 14:14:20 +0000 UTC | | 1332151919 | 2012-03-19 10:11:59 +0000 UTC | | 1384216367189 | 2013-11-12 00:32:47.189 +0000 UTC | | 1384216367111222 | 2013-11-12 00:32:47.111222 +0000 UTC | | 1384216367111222333 | 2013-11-12 00:32:47.111222333 +0000 UTC | +-------------------------------------------------------+-----------------------------------------+ */
以上就是GO中的時間操作總結(jié)(time&dateparse)的詳細(xì)內(nèi)容,更多關(guān)于GO時間操作的資料請關(guān)注腳本之家其它相關(guān)文章!
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