# isIanaTimeZone

> Whether value is an IANA time zone name (e.g. America/Belem, UTC). UTC offsets (-03:00) and unknown names are not valid. Uses the built-in Intl, so no time zone database is bundled.

> **isIanaTimeZone**(`value`): `boolean`

Whether `value` is an IANA time zone name (e.g. `America/Belem`, `UTC`).
UTC offsets (`-03:00`) and unknown names are not valid. Uses the built-in
`Intl`, so no time zone database is bundled.

## Parameters

### value

`string`

## Returns

`boolean`