[Go] Time

Golang Time 패키지

Time struct

type Time struct {
    wall uint64
    ext  int64
    loc *Location
}

Time 생성 방법

time.now()
time.Date(year int, month Month...)
time.Unix(sec int64, nsec int64) 

Time Test

func TestTime(t *testing.T) {
    now := time.Now()
    t.Log(now) // 2022-08-02 11:14:48.8866312 +0900 KST m=+0.002534901

    nowFormat := time.Now().Format("2006-01-02 15:04:05")
    t.Log(nowFormat) // 2022-08-02 11:17:33 (https://flaviocopes.com/go-date-time-format/?fbclid=IwAR0zPE9XTBDAKnrWza6m6cOGQecch-MWdf1VNdcMGvCPSBxfhEIJcje2j6I)

    utc := time.UTC
    kst, _ := time.LoadLocation("Asia/Seoul")

    whenUtc := time.Date(2020, 1, 1, 12, 10, 20, 0, utc)
    t.Log(whenUtc) // 2020-01-01 12:10:20 +0000 UTC
    whenKst := time.Date(2020, 1, 1, 12, 10, 20, 0, kst)
    t.Log(whenKst) // 2020-01-01 12:10:20 +0900 KST
}

Duration

type Duration int64

// 아래 미리 정의된 Constants를 사용할 수도 있다.
const (
   Nanosecond  Duration = 1
   Microsecond          = 1000 * Nanosecond
   Millisecond          = 1000 * Microsecond
   Second               = 1000 * Millisecond
   Minute               = 60 * Second
   Hour                 = 60 * Minute
)

Duration Test

func TestDuration(t *testing.T) {
    when := time.Date(2020, 1, 1, 12, 10, 20, 0, time.UTC)
    t.Log(when) // 2020-01-01 12:10:20 +0000 UTC

    whenAddSec := when.Add(time.Second * 10)
    whenAddHour := when.Add(time.Hour * 10)
    t.Log(whenAddSec)  // 2020-01-01 12:10:30 +0000 UTC
    t.Log(whenAddHour) // 2020-01-01 22:10:20 +0000 UTC

    assert.Equal(t, when.Before(whenAddSec), true)
    assert.Equal(t, when.Before(whenAddHour), true)

    assert.Equal(t, when.After(whenAddSec), false)
    assert.Equal(t, when.After(whenAddHour), false)

    assert.Equal(t, when.Equal(whenAddSec), false)
    assert.Equal(t, when.Equal(whenAddHour), false)
}