mirror of
https://github.com/oven-sh/bun
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36 lines
944 B
Markdown
36 lines
944 B
Markdown
---
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name: Set a time zone in Bun
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---
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Bun supports programmatically setting a default time zone for the lifetime of the `bun` process. To do set, set the value of the `TZ` environment variable to a [valid timezone identifier](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones).
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{% callout %}
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When running a file with `bun`, the timezone defaults to your system's configured local time zone.
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When running tests with `bun test`, the timezone is set to `UTC` to make tests more deterministic.
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{% /callout %}
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```ts
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process.env.TZ = "America/New_York";
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```
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---
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Alternatively, this can be set from the command line when running a Bun command.
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```sh
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$ TZ=America/New_York bun run dev
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```
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---
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Once `TZ` is set, any `Date` instances will have that time zone. By default all dates use your system's configured time zone.
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```ts
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new Date().getHours(); // => 18
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process.env.TZ = "America/New_York";
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new Date().getHours(); // => 21
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```
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