wehub-resource-sync
23 lines
720 B
TypeScript
23 lines
720 B
TypeScript
export function getTimezones(includeUtc = true) {
|
|
const possibleTimezones = Intl.supportedValuesOf("timeZone").sort();
|
|
if (includeUtc) {
|
|
possibleTimezones.unshift("UTC");
|
|
}
|
|
return possibleTimezones;
|
|
}
|
|
|
|
/**
|
|
* Whether the runtime can resolve this IANA timezone. Prefer this over checking membership
|
|
* in `Intl.supportedValuesOf("timeZone")`, which lists only canonical ids and omits zones
|
|
* browsers legitimately report (e.g. "UTC", "Etc/UTC", "Asia/Kolkata") — rejecting those
|
|
* would leave a client's stored timezone stale.
|
|
*/
|
|
export function isValidTimeZone(timeZone: string): boolean {
|
|
try {
|
|
new Intl.DateTimeFormat("en-US", { timeZone });
|
|
return true;
|
|
} catch {
|
|
return false;
|
|
}
|
|
}
|