45 lines
1.7 KiB
TypeScript
45 lines
1.7 KiB
TypeScript
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/*
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Copyright 2024-2026 ChatterMate
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import { clientTz, listTz } from 'timezone-select-js'
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export interface TimezoneOption {
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value: string
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label: string
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/** Other IANA names the library files under this entry. */
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included?: string[]
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}
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const UTC_OPTION: TimezoneOption = { value: 'UTC', label: '(GMT+00:00) UTC' }
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/**
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* The timezones an organization can pick. The library's list has no plain UTC —
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* the zone servers, containers and CI browsers report — so it is added.
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*/
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export function timezoneOptions(): TimezoneOption[] {
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const options: TimezoneOption[] = listTz()
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return options.some((option) => option.value === UTC_OPTION.value) ? options : [UTC_OPTION, ...options]
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}
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/**
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* The browser's timezone as one of `options` — by name, then by alias — or UTC.
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* A value the select doesn't list leaves the required field empty, and the
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* first-run setup form could not be submitted at all.
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*/
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export function defaultTimezone(options: TimezoneOption[] = timezoneOptions(), zone: string = clientTz()): string {
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const match = options.find((option) => option.value === zone || option.included?.includes(zone))
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return match ? match.value : UTC_OPTION.value
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}
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