a8ee83af78
In most cases users will format and parse times using the constants provided in package time. Show these first before getting into custom example-based formats.
54 lines
1.6 KiB
Go
54 lines
1.6 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, using the corresponding format
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// constant.
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t := time.Now()
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p(t.Format(time.RFC3339))
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// Time parsing uses the same format values as `Format`
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// does.
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t1, e := time.Parse(
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time.RFC3339,
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"2012-11-01T22:08:41+00:00")
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p(t1)
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// `Format` and `Parse` uses example-based formats. They
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// take 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/parse the given
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// time/string. The example time must be exactly as shown:
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// the year 2006, 15 for the hour, Monday for the day of
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// the week, etc. Usually you'll use a constant from
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// `time` for these formats, but you can also supply
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// custom formats.
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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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form := "3 04 PM"
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t2, e := time.Parse(form, "8 41 PM")
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p(t2)
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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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// `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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}
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