39 lines
981 B
Plaintext
39 lines
981 B
Plaintext
---
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title: Set a time zone in Bun
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sidebarTitle: Set time zone
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mode: center
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---
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Bun supports programmatically setting a default time zone for the lifetime of the `bun` process. Set the `TZ` environment variable to a [valid time zone identifier](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones).
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<Note>
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When running a file with `bun`, the time zone defaults to your system's configured local time zone.
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When running tests with `bun test`, Bun sets the time zone to `UTC` to make tests more deterministic.
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</Note>
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```ts process.ts icon="/icons/typescript.svg"
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process.env.TZ = "America/New_York";
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```
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---
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You can also set `TZ` on the command line when running a Bun command.
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```sh terminal icon="terminal"
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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, every `Date` instance uses that time zone.
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```ts process.ts icon="/icons/typescript.svg"
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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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