Time

package main

import (
    "fmt"
    "time"
)

func main() {

    now := time.Now()
    fmt.Println(now)
}

package main

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println

    then := time.Date(
        2009, 11, 17, 20, 34, 58, 651387237, 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())
}

package main

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println

    now := time.Now()

    then := time.Date(
        2009, 11, 17, 20, 34, 58, 651387237, time.UTC)

    p(then.Before(now))
    p(then.After(now))
    p(then.Equal(now))
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Year())
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	// Pretty Print.
	fmt.Println(now.Month())

	// Integer value.
	fmt.Println(int(now.Month()))

	// Compare with a month enum constant.
	fmt.Println(now.Month() == time.January)
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()

	year, week := now.ISOWeek()
	fmt.Println(year, week)
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Hour())
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Minute())
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Second())
}

package main

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println

    now := time.Now()

    then := time.Date(
        2009, 11, 17, 20, 34, 58, 651387237, time.UTC)

    // The Sub methods returns a Duration representing the interval between two times.
    diff := now.Sub(then)
    p(diff)

    p(diff.Hours())
    p(diff.Minutes())
    p(diff.Seconds())
    p(diff.Nanoseconds())
}

package main

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println

    now := time.Now()

    then := time.Date(
        2009, 11, 17, 20, 34, 58, 651387237, time.UTC)

    diff := now.Sub(then)

    p(then.Add(diff))
    p(then.Add(-diff))
}

package main

import (
    "fmt"
    "time"
)

func main() {

    now := time.Now()
    secs := now.Unix()
    nanos := now.UnixNano()
    fmt.Println(now)

    // Note that there is no UnixMillis, so to get the milliseconds since epoch
    // you'll need to manually divide from nanoseconds.
    millis := nanos / 1000000
    fmt.Println(secs)
    fmt.Println(millis)
    fmt.Println(nanos)

    // You can also convert integer seconds or nanoseconds since the epoch into the corresponding time.
    fmt.Println(time.Unix(secs, 0))
    fmt.Println(time.Unix(0, nanos))
}

package main

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println

    // Here's a basic example of formatting a time according to RFC3339,
    // using the corresponding layout constant.
    t := time.Now()
    p(t.Format(time.RFC3339))

    // Layouts must use the reference time Mon Jan 2 15:04:05 MST 2006 to show the pattern
    // with which to format a given time/string.
    p(t.Format("3:04PM"))
    p(t.Format("Mon Jan _2 15:04:05 2006"))
    p(t.Format("2006-01-02T15:04:05.999999-07:00"))

    // For purely numeric representations you can also use standard string formatting
    // with the extracted components of the time value.
    fmt.Printf("%d-%02d-%02dT%02d:%02d:%02d-00:00\n",
        t.Year(), t.Month(), t.Day(),
        t.Hour(), t.Minute(), t.Second())
}

package main

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println

    t1, e := time.Parse(
        time.RFC3339,
        "2012-11-01T22:08:41+00:00")
    p(t1)

    form := "3 04 PM"
    t2, e := time.Parse(form, "8 41 PM")
    p(t2)

    // Parse will return an error on malformed input explaining the parsing problem.
    ansic := "Mon Jan _2 15:04:05 2006"
    _, e = time.Parse(ansic, "8:41PM")
    p(e)
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Nanosecond())
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Nanosecond() / 1000000)
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.Nanosecond() / 1000)
}

package main

import (
	"fmt"
	"time"
)

func main() {
	h, _ := time.ParseDuration("4h30m")
	fmt.Printf("I've got %.1f hours of work left.", h.Hours())
}

package main

import (
	"fmt"
	"time"
)

func main() {
	m, _ := time.ParseDuration("1h30m")
	fmt.Printf("The movie is %.0f minutes long.", m.Minutes())
}

package main

import (
	"fmt"
	"time"
)

func main() {
	m, _ := time.ParseDuration("1m30s")
	fmt.Printf("Take off in t-%.0f seconds.", m.Seconds())
}

package main

import (
	"fmt"
	"time"
)

func main() {
	m, _ := time.ParseDuration("1m30s")
	fmt.Printf("%d millseconds.", m.Milliseconds())
}

package main

import (
	"fmt"
	"time"
)

func main() {
	m, _ := time.ParseDuration("1m30s")
	fmt.Printf("%d microseconds.", m.Microseconds())
}

package main

import (
	"fmt"
	"time"
)

func main() {
	u, _ := time.ParseDuration("1µs")
	fmt.Printf("One microsecond is %d nanoseconds.\n", u.Nanoseconds())
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()

	// Day name.
	fmt.Println(now.Weekday())

	// Day integer.
	fmt.Println(int(now.Weekday()))

	// Compare with enum.
	fmt.Println(now.Weekday() == time.Monday)
}

package main

import (
	"fmt"
	"time"
)

func main() {

	now := time.Now()
	fmt.Println(now.YearDay())
}

package main

import (
	"fmt"
	"time"
)

func main() {
	d := time.Date(2000, 2, 1, 12, 30, 0, 0, time.UTC)
	day := d.Day()

	fmt.Printf("day = %v\n", day)
}