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Website : rimsha.abasa.com
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Filename : timezone.js
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const MAKKAH_UTC_OFFSET_MINUTES = 3 * 60; // UTC+3 without DST

/**
 * Converts a 12-hour clock string stored in Makkah local time
 * (e.g. "08:30 AM") into a Date object aligned to the provided
 * reference date in UTC.
 *
 * The stored value remains untouched; use this helper wherever
 * UTC-aware comparisons are required.
 *
 * @param {string} timeString - 12-hour formatted time (HH:MM AM/PM)
 * @param {Date} referenceDate - Date whose UTC day is used (defaults to now)
 * @returns {Date} UTC Date representing the same instant
 */
export const convertMakkahTimeStringToUTC = (timeString, referenceDate = new Date()) => {
  if (!timeString || typeof timeString !== 'string') {
    throw new Error('Invalid time string provided for conversion');
  }

  const [timePart, modifier = 'AM'] = timeString.trim().split(' ');
  let [hours, minutes] = timePart.split(':').map((value) => parseInt(value, 10));

  if (isNaN(hours) || isNaN(minutes)) {
    throw new Error(`Unable to parse time string "${timeString}"`);
  }

  const normalizedModifier = modifier.toUpperCase();
  if (normalizedModifier === 'PM' && hours !== 12) {
    hours += 12;
  } else if (normalizedModifier === 'AM' && hours === 12) {
    hours = 0;
  }

  const makkahMinutes = hours * 60 + minutes;
  const utcMinutes = makkahMinutes - MAKKAH_UTC_OFFSET_MINUTES;

  const utcDate = new Date(Date.UTC(
    referenceDate.getUTCFullYear(),
    referenceDate.getUTCMonth(),
    referenceDate.getUTCDate(),
    0, 0, 0, 0
  ));

  // Date takes care of day rollover when minutes are <0 or >1440
  utcDate.setUTCMinutes(utcMinutes);
  return utcDate;
};