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<!-- if this PR closes one or more issues, you can automatically link the PR with them by using one of the [*linking keywords*](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword), e.g. - this PR should close #xxxx - fixes #xxxx you can also mention related issues, PRs or discussions! --> # Description <!-- Thank you for improving Nushell. Please, check our [contributing guide](../CONTRIBUTING.md) and talk to the core team before making major changes. Description of your pull request goes here. **Provide examples and/or screenshots** if your changes affect the user experience. --> This PR seeks to add a direct port of the python polars `replace_time_zone` command in the `dt` namespace (https://docs.pola.rs/api/python/stable/reference/series/api/polars.Series.dt.replace_time_zone.html). Please note: I opted for two keywords "dt" and "replace-time-zone" to map directly with the implementation in both the rust and python packages, but I'm open to simplifying it to just one keyword, or `polars replace-time-zone` ```nushell # Apply timezone to a naive datetime > ["2021-12-30 00:00:00" "2021-12-31 00:00:00"] | polars into-df | polars as-datetime "%Y-%m-%d %H:%M:%S" --naive | polars select (polars col datetime | polars dt replace-time-zone "America/New_York") ╭───┬─────────────────────╮ │ # │ datetime │ ├───┼─────────────────────┤ │ 0 │ 12/30/21 12:00:00AM │ │ 1 │ 12/31/21 12:00:00AM │ ╰───┴─────────────────────╯ # Apply timezone with ambiguous datetime > ["2025-11-02 00:00:00", "2025-11-02 01:00:00", "2025-11-02 02:00:00", "2025-11-02 03:00:00"] | polars into-df | polars as-datetime "%Y-%m-%d %H:%M:%S" --naive | polars select (polars col datetime | polars dt replace-time-zone "America/New_York" --ambiguous null) ╭───┬─────────────────────╮ │ # │ datetime │ ├───┼─────────────────────┤ │ 0 │ 11/02/25 12:00:00AM │ │ 1 │ │ │ 2 │ 11/02/25 02:00:00AM │ │ 3 │ 11/02/25 03:00:00AM │ ╰───┴─────────────────────╯ # Apply timezone with nonexistent datetime > ["2025-03-09 01:00:00", "2025-03-09 02:00:00", "2025-03-09 03:00:00", "2025-03-09 04:00:00"] | polars into-df | polars as-datetime "%Y-%m-%d %H:%M:%S" --naive | polars select (polars col datetime | polars dt replace-time-zone "America/New_York" --nonexistent null) ╭───┬─────────────────────╮ │ # │ datetime │ ├───┼─────────────────────┤ │ 0 │ 03/09/25 01:00:00AM │ │ 1 │ │ │ 2 │ 03/09/25 03:00:00AM │ │ 3 │ 03/09/25 04:00:00AM │ ╰───┴─────────────────────╯ ``` # User-Facing Changes No breaking changes. The user will be able to access the new command. # Tests + Formatting See example tests. # After Submitting |
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