github.com/timberio/go-datemath
Package datemath provides an expression language for relative dates based on Elasticsearch's date math. This package is useful for letting end-users describe dates in a simple format similar to Grafana and Kibana and for persisting them as relative dates. The expression starts with an anchor date, which can either be "now", or an ISO8601 date string ending with ||. This anchor date can optionally be followed by one or more date math expressions, for example: The supported time units are: This package aims to be a superset of Elasticsearch's expressions. That is, any datemath expression that is valid for Elasticsearch should evaluate in the same way here. Currently the package does not support expressions outside of those also considered valid by Elasticsearch, but this may change in the future to include additional functionality.
Readme
This library provides support for parsing datemath expressions compatibly with Elasticsearch datemath expressions. These are useful for allowing users to specify, and for encoding, relative dates. Examples:
now+15m: 15 minutes from nownow-1w+1d: one day after on week ago2015-05-05T00:00:00||+1M: one month after 2019-05-05These expressions will seem familiar if you have used Grafana or Kibana.
Example usage:
expr, _ := datemath.Parse("now-15m")
fmt.Println(t.Time(datemath.WithNow(now)))
See package documentation for usage and more examples.
See CONTRIBUTING.md.
FAQs
Package datemath provides an expression language for relative dates based on Elasticsearch's date math. This package is useful for letting end-users describe dates in a simple format similar to Grafana and Kibana and for persisting them as relative dates. The expression starts with an anchor date, which can either be "now", or an ISO8601 date string ending with ||. This anchor date can optionally be followed by one or more date math expressions, for example: The supported time units are: This package aims to be a superset of Elasticsearch's expressions. That is, any datemath expression that is valid for Elasticsearch should evaluate in the same way here. Currently the package does not support expressions outside of those also considered valid by Elasticsearch, but this may change in the future to include additional functionality.
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