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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
committed by GitHub
parent 4b2b47af48
commit b35893d783
15 changed files with 704 additions and 17 deletions
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pkg/yqlib/doc/operators/subtract.md
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@@ -117,6 +117,38 @@ a: 2
b: 4
```
## Date subtraction
You can subtract durations from dates. Assumes RFC3339 date time format, see [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
Given a sample.yml file of:
```yaml
a: 2021-01-01T03:10:00Z
```
then
```bash
yq '.a -= "3h10m"' sample.yml
```
will output
```yaml
a: 2021-01-01T00:00:00Z
```
## Date subtraction - custom format
Use with_dtf to specify your datetime format. See [date-time operators](https://mikefarah.gitbook.io/yq/operators/date-time-operators) for more information.
Given a sample.yml file of:
```yaml
a: Saturday, 15-Dec-01 at 6:00AM GMT
```
then
```bash
yq 'with_dtf("Monday, 02-Jan-06 at 3:04PM MST", .a -= "3h1m")' sample.yml
```
will output
```yaml
a: Saturday, 15-Dec-01 at 2:59AM GMT
```
## Custom types: that are really numbers
When custom tags are encountered, yq will try to decode the underlying type.