43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
cronexpression for Go
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=====================
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Go language (golang) cron expression parser. Given a cron expression and a time stamp, you can get the next time stamp which satisfy the cron expression.
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The reference documentation for this implementation is found at
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https://en.wikipedia.org/wiki/Cron#CRON_expression, with the following
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differences:
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* Supports the second field (before minute field)
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* If five fields are present, a wildcard year field is appended
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* If six field are present, "0" is prepended as second field
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* Domain for day-of-week field is [0-7] instead of [0-6], 7 being Sunday, like zero.
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* `@reboot` is not supported, as it is meaningless for a cron expression parser library
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* As of now, the behavior of the code is undetermined if a malformed cron expression is supplied (most likely, code will panic)
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Install
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-------
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go get github.com/gorhill/cronexpression
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Usage
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-----
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Import the library:
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import "github.com/gorhill/cronexpression"
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import "time"
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Simplest way:
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nextTime := cronexpression.NextTimeFromCronString("0 0 29 2 *", time.Now())
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Assuming `time.Now()` is "2013-08-29 09:28:00", then `nextTime` will be "2016-02-29 00:00:00".
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If you need to reuse many times a cron expression in your code, it is more efficient
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to create a `CronExpression` object once and keep a copy of it for reuse:
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cronexpr := cronexpression.NewCronExpression("0 0 29 2 *")
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nextTime := cronexpr.NextTime(time.Now())
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