32 lines
1.1 KiB
TypeScript
32 lines
1.1 KiB
TypeScript
import moment from "moment-timezone";
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import escapeStringRegexp from "escape-string-regexp";
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const normalizeTzName = str => str.replace(/[^a-zA-Z0-9+\-]/g, "").toLowerCase();
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const validTimezones = moment.tz.names();
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const normalizedTimezoneMap = validTimezones.reduce((map, tz) => {
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map.set(normalizeTzName(tz), tz);
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return map;
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}, new Map());
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const normalizedTimezones = Array.from(normalizedTimezoneMap.keys());
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export function parseFuzzyTimezone(input: string) {
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const normalizedInput = normalizeTzName(input);
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if (normalizedTimezoneMap.has(normalizedInput)) {
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return normalizedTimezoneMap.get(normalizedInput);
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}
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const searchRegex = new RegExp(`.*${escapeStringRegexp(normalizedInput)}.*`);
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for (const tz of normalizedTimezones) {
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if (searchRegex.test(tz)) {
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const result = normalizedTimezoneMap.get(tz);
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// Ignore Etc/GMT timezones unless explicitly specified, as they have confusing functionality
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// with the inverted +/- sign
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if (result.startsWith("Etc/GMT")) continue;
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return result;
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}
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}
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return null;
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}
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