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Date Time Ops (#1110)

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* Added datetime operators

* Added date subtract support
This commit is contained in:
Mike Farah
2022-02-14 15:37:43 +11:00
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parent 4b2b47af48
commit b35893d783
15 changed files with 704 additions and 17 deletions
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pkg/yqlib/doc/operators/headers/datetime.md
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# Date Time
Various operators for parsing and manipulating dates.
## Date time formattings
This uses the golangs built in time library for parsing and formatting date times.
When not specified, the RFC3339 standard is assumed `2006-01-02T15:04:05Z07:00` for parsing.
To specify a custom parsing format, use the `with_dtf` operator. The first parameter sets the datetime parsing format for the expression in the second parameter. The expression can be any valid `yq` expression tree.
```bash
yq 'with_dtf("myformat"; .a + "3h" | tz("Australia/Melbourne"))'
```
See https://pkg.go.dev/time#pkg-constants for examples of formatting options.
## Timezones
This uses golangs built in LoadLocation function to parse timezones strings. See https://pkg.go.dev/time#LoadLocation for more details.
## Durations
Durations are parsed using golangs built in [ParseDuration](https://pkg.go.dev/time#ParseDuration) function.
You can durations to time using the `+` operator.