type Time struct { // wall and ext encode the wall time seconds, wall time nanoseconds, // and optional monotonic clock reading in nanoseconds. // // From high to low bit position, wall encodes a 1-bit flag (hasMonotonic), // a 33-bit seconds field, and a 30-bit wall time nanoseconds field. // The nanoseconds field is in the range [0, 999999999]. // If the hasMonotonic bit is 0, then the 33-bit field must be zero // and the full signed 64-bit wall seconds since Jan 1 year 1 is stored in ext. // If the hasMonotonic bit is 1, then the 33-bit field holds a 33-bit // unsigned wall seconds since Jan 1 year 1885, and ext holds a // signed 64-bit monotonic clock reading, nanoseconds since process start. wall uint64 ext int64 // loc specifies the Location that should be used to // determine the minute, hour, month, day, and year // that correspond to this Time. // The nil location means UTC. // All UTC times are represented with loc==nil, never loc==&utcLoc. loc *Location }上面代码中:
UTC + 时区差 = 本地时间
国内一般使用的是北京时间,与 UTC 的时间关系如下:UTC + 8 个小时 = 北京时间
在Go语言的 time 包里面有两个时区变量,如下:FixedZone(name string, offset int) *Location
其中,name 为时区名称,offset 是与 UTC 之前的时差。LoadLocation(name string) (*Location, error)
其中,name 为时区的名字。package main import ( "fmt" "time" ) func main() { now := time.Now() //获取当前时间 fmt.Printf("current time:%v\n", now) year := now.Year() //年 month := now.Month() //月 day := now.Day() //日 hour := now.Hour() //小时 minute := now.Minute() //分钟 second := now.Second() //秒 fmt.Printf("%d-%02d-%02d %02d:%02d:%02d\n", year, month, day, hour, minute, second) }运行结果如下:
current time:2019-12-12 12:33:19.4712277 +0800 CST m=+0.006980401
2019-12-12 12:33:19
package main import ( "fmt" "time" ) func main() { now := time.Now() //获取当前时间 timestamp1 := now.Unix() //时间戳 timestamp2 := now.UnixNano() //纳秒时间戳 fmt.Printf("现在的时间戳:%v\n", timestamp1) fmt.Printf("现在的纳秒时间戳:%v\n", timestamp2) }运行结果如下:
现在的时间戳:1576127858
现在的纳秒时间戳:1576127858829900100
package main import ( "fmt" "time" ) func main() { now := time.Now() //获取当前时间 timestamp := now.Unix() //时间戳 timeObj := time.Unix(timestamp, 0) //将时间戳转为时间格式 fmt.Println(timeObj) year := timeObj.Year() //年 month := timeObj.Month() //月 day := timeObj.Day() //日 hour := timeObj.Hour() //小时 minute := timeObj.Minute() //分钟 second := timeObj.Second() //秒 fmt.Printf("%d-%02d-%02d %02d:%02d:%02d\n", year, month, day, hour, minute, second) }运行结果如下:
2019-12-12 13:24:09 +0800 CST
2019-12-12 13:24:09
package main import ( "fmt" "time" ) func main() { //时间戳 t := time.Now() fmt.Println(t.Weekday().String()) }运行结果如下:
Thursday
func (t Time) Add(d Duration) Time
Add 函数可以返回时间点 t + 时间间隔 d 的值。package main import ( "fmt" "time" ) func main() { now := time.Now() later := now.Add(time.Hour) // 当前时间加1小时后的时间 fmt.Println(later) }运行结果如下:
2019-12-12 16:00:29.9866943 +0800 CST m=+3600.007978201
func (t Time) Sub(u Time) Duration
返回一个时间段 t - u 的值。如果结果超出了 Duration 可以表示的最大值或最小值,将返回最大值或最小值,要获取时间点 t - d(d 为 Duration),可以使用 t.Add(-d)。func (t Time) Equal(u Time) bool
Equal 函数会考虑时区的影响,因此不同时区标准的时间也可以正确比较,Equal 方法和用 t==u 不同,Equal 方法还会比较地点和时区信息。func (t Time) Before(u Time) bool
如果 t 代表的时间点在 u 之前,则返回真,否则返回假。func (t Time) After(u Time) bool
如果 t 代表的时间点在 u 之后,则返回真,否则返回假。package main import ( "fmt" "time" ) func main() { ticker := time.Tick(time.Second) //定义一个1秒间隔的定时器 for i := range ticker { fmt.Println(i) //每秒都会执行的任务 } }运行结果如下:
2019-12-12 15:14:26.4158067 +0800 CST m=+16.007460701
2019-12-12 15:14:27.4159467 +0800 CST m=+17.007600701
2019-12-12 15:14:28.4144689 +0800 CST m=+18.006122901
2019-12-12 15:14:29.4159581 +0800 CST m=+19.007612101
2019-12-12 15:14:30.4144337 +0800 CST m=+20.006087701
...
Y-m-d H:M:S
而是使用Go语言的诞生时间 2006 年 1 月 2 号 15 点 04 分 05 秒。提示:如果想将时间格式化为 12 小时格式,需指定 PM。
package main import ( "fmt" "time" ) func main() { now := time.Now() // 格式化的模板为Go的出生时间2006年1月2号15点04分 Mon Jan // 24小时制 fmt.Println(now.Format("2006-01-02 15:04:05.000 Mon Jan")) // 12小时制 fmt.Println(now.Format("2006-01-02 03:04:05.000 PM Mon Jan")) fmt.Println(now.Format("2006/01/02 15:04")) fmt.Println(now.Format("15:04 2006/01/02")) fmt.Println(now.Format("2006/01/02")) }运行结果如下:
2019-12-12 15:20:52.037 Thu Dec
2019-12-12 03:20:52.037 PM Thu Dec
2019/12/12 15:20
15:20 2019/12/12
2019/12/12
func Parse(layout, value string) (Time, error)
与 Parse 函数类似的还有 ParseInLocation 函数。func ParseInLocation(layout, value string, loc *Location) (Time, error)
ParseInLocation 与 Parse 函数类似,但有两个重要的不同之处:package main import ( "fmt" "time" ) func main() { var layout string = "2006-01-02 15:04:05" var timeStr string = "2019-12-12 15:22:12" timeObj1, _ := time.Parse(layout, timeStr) fmt.Println(timeObj1) timeObj2, _ := time.ParseInLocation(layout, timeStr, time.Local) fmt.Println(timeObj2) }运行结果如下:
2019-12-12 15:22:12 +0000 UTC
2019-12-12 15:22:12 +0800 CST
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