34 lines
1.0 KiB
Go
34 lines
1.0 KiB
Go
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package basic
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import (
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"time"
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)
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// TimeScale 导出时间标签的时标，零值为民用 UTC / output-label time scale, defaulting to civil UTC.
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type TimeScale int
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const (
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// TimeScaleUTC 默认民用时标 / default civil time scale.
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TimeScaleUTC TimeScale = iota
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// TimeScaleUT1 UT1 读数，输出 Location 须为 nil 或 UTC / UT1 reading; output Location must be nil or UTC.
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TimeScaleUT1
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)
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// LabelIn 把民用时刻换成该时标下的时刻值 / converts a civil instant to a value in one scale.
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func LabelIn(scale TimeScale, date time.Time) time.Time {
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if scale == TimeScaleUT1 {
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return UT1FromUTC(date)
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}
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return date
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}
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// UT1FromUTC 民用时刻转 UT1 读数，以 UTC Location 承载 / converts a civil instant to a UT1 reading in a UTC Location.
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func UT1FromUTC(date time.Time) time.Time {
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return JD2DateByZone(UTC2UT1(Date2JD(date.UTC())), time.UTC, false)
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}
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// DUT1 返回民用时刻的 UT1−UTC，单位秒 / UT1−UTC in seconds.
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func DUT1(date time.Time) float64 {
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return DUT1Seconds(Date2JD(date.UTC()))
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}
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