58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
// Go supports time formatting and parsing via
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// pattern-based layouts.
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package main
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import "fmt"
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import "time"
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func main() {
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p := fmt.Println
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// Here's a basic example of formatting a time
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// according to RFC3339.
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t := time.Now()
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p(t.Format("2006-01-02T15:04:05Z07:00"))
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// `Format` uses an example-based layout approach; it
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// takes a formatted version of the reference time
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// `Mon Jan 2 15:04:05 MST 2006` to determine the
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// general pattern with which to format the given
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// time. The examples must be exactly as shown: only
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// `2006` for the year, only `15` for the hour, only
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// `Mon` for the day of week, and so on. Here are a
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// few more examples of time formatting.
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p(t.Format("3:04PM"))
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p(t.Format("Mon Jan _2 15:04:05 2006"))
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p(t.Format("2006-01-02T15:04:05.999999-07:00"))
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// For purely numeric representations you can also
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// use standard string formatting with the extracted
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// components of the time value.
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fmt.Printf("%d-%02d-%02dT%02d:%02d:%02d-00:00\n",
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t.Year(), t.Month(), t.Day(),
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t.Hour(), t.Minute(), t.Second())
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// Time parsing uses the same example-based approach
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// as `Format`ing. These examples parse times rendered
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// with some of the layouts used above.
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withNanos := "2006-01-02T15:04:05.999999999-07:00"
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t1, e := time.Parse(
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withNanos,
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"2012-11-01T22:08:41.117442+00:00")
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p(t1)
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kitchen := "3:04PM"
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t2, e := time.Parse(kitchen, "8:41PM")
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p(t2)
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// `Parse` will return an error on malformed input
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// explaining the parsing problem.
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ansic := "Mon Jan _2 15:04:05 2006"
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_, e = time.Parse(ansic, "8:41PM")
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p(e)
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// There are several predefined formats that you can
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// use for both formatting and parsing.
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p(t.Format(time.Kitchen))
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}
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