forked from Yara724/api
83 lines
2.4 KiB
TypeScript
83 lines
2.4 KiB
TypeScript
/** Iran standard time (Asia/Tehran, UTC+3:30; no DST since 2022). */
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export const IRAN_TIMEZONE = "Asia/Tehran";
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const IRAN_UTC_OFFSET = "+03:30";
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const DATE_ONLY_RE = /^\d{4}-\d{2}-\d{2}$/;
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const TIME_HM_RE = /^(\d{1,2}):(\d{2})(?::(\d{2}))?$/;
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const NAIVE_ISO_DATETIME_RE =
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/^(\d{4}-\d{2}-\d{2})[T\s](\d{1,2}:\d{2}(?::\d{2})?)$/;
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/**
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* Gregorian calendar date (`YYYY-MM-DD`) for an instant in Iran.
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*/
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export function gregorianDateInIran(d: Date): string {
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return new Intl.DateTimeFormat("en-CA", {
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timeZone: IRAN_TIMEZONE,
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year: "numeric",
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month: "2-digit",
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day: "2-digit",
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}).format(d);
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}
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function normalizeTimeToHms(time: string): string | null {
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const m = String(time).trim().match(TIME_HM_RE);
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if (!m) return null;
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const hh = m[1].padStart(2, "0");
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const mm = m[2];
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const ss = m[3] ?? "00";
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return `${hh}:${mm}:${ss}`;
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}
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function parseIranLocalIso(isoDate: string, timeHms: string): Date | null {
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const d = new Date(`${isoDate}T${timeHms}${IRAN_UTC_OFFSET}`);
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return Number.isNaN(d.getTime()) ? null : d;
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}
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/**
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* Combines a calendar date and optional `HH:MM` / `HH:MM:SS` as Iran local
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* time and returns the corresponding UTC instant.
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*/
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export function parseIranLocalDateTime(
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date: Date | string,
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time?: string,
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): Date | null {
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if (date instanceof Date) {
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if (Number.isNaN(date.getTime())) return null;
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const cleanTime = (time ?? "").trim();
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if (!cleanTime) return date;
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const timeHms = normalizeTimeToHms(cleanTime);
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if (!timeHms) return null;
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return parseIranLocalIso(gregorianDateInIran(date), timeHms);
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}
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const raw = String(date).trim();
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if (!raw) return null;
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if (/[zZ]|[+-]\d{2}:?\d{2}$/.test(raw)) {
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const d = new Date(raw);
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return Number.isNaN(d.getTime()) ? null : d;
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}
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const naive = raw.match(NAIVE_ISO_DATETIME_RE);
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if (naive) {
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const timeHms = normalizeTimeToHms(naive[2]);
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if (!timeHms) return null;
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return parseIranLocalIso(naive[1], timeHms);
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}
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if (DATE_ONLY_RE.test(raw)) {
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const cleanTime = (time ?? "").trim();
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if (!cleanTime) {
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const d = new Date(`${raw}T00:00:00${IRAN_UTC_OFFSET}`);
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return Number.isNaN(d.getTime()) ? null : d;
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}
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const timeHms = normalizeTimeToHms(cleanTime);
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if (!timeHms) return null;
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return parseIranLocalIso(raw, timeHms);
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}
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const d = new Date(raw);
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return Number.isNaN(d.getTime()) ? null : d;
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}
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