Function cronToHuman

src/lib/cron-parser.ts:40–115

(expr: string)

 *   "30 14 1 * *" → "On day 1 of every month at 2:30 PM"
 */
export function cronToHuman(expr: string): string {
  const parts = parseCron(expr);
  if (!parts) return 'Invalid cron expression';

  const { minute, hour, dayOfMonth, month, dayOfWeek } = parts;

  // Format time
  const formatTime = (h: string, m: string): string => {
    if (h === '*' || m === '*') return '';
    const hourNum = parseInt(h);
    const minNum = parseInt(m);
    const period = hourNum >= 12 ? 'PM' : 'AM';
    const hour12 = hourNum === 0 ? 12 : hourNum > 12 ? hourNum - 12 : hourNum;
    return `${hour12}:${minNum.toString().padStart(2, '0')} ${period}`;
  };

  const time = formatTime(hour, minute);

  // Every minute
  if (minute === '*' && hour === '*' && dayOfMonth === '*' && month === '*' && dayOfWeek === '*') {
    return 'Every minute';
  }

  // Every hour at specific minute
  if (minute !== '*' && hour === '*' && dayOfMonth === '*' && month === '*' && dayOfWeek === '*') {
    const minNum = parseInt(minute);
    if (minNum === 0) return 'Every hour on the hour';
    return `Every hour at minute ${minute}`;
  }

  // Specific time every day
  if (minute !== '*' && hour !== '*' && dayOfMonth === '*' && month === '*' && dayOfWeek === '*') {
    return `Every day at ${time}`;
  }

  // Specific weekday
  if (minute !== '*' && hour !== '*' && dayOfMonth === '*' && month === '*' && dayOfWeek !== '*') {
    const days = dayOfWeek.split(',').map(d => {
      const dayNum = parseInt(d);
      return DAYS_OF_WEEK[dayNum] || d;
    });
    if (days.length === 1) {
      return `Every ${days[0]} at ${time}`;
    }
    return `Every ${days.join(', ')} at ${time}`;
  }

  // Specific day of month
  if (minute !== '*' && hour !== '*' && dayOfMonth !== '*' && month === '*' && dayOfWeek === '*') {
    const dayNum = parseInt(dayOfMonth);
    const suffix = getDaySuffix(dayNum);
    return `On the ${dayNum}${suffix} of every month at ${time}`;
  }

  // Specific month and day
  if (minute !== '*' && hour !== '*' && dayOfMonth !== '*' && month !== '*' && dayOfWeek === '*') {
    const dayNum = parseInt(dayOfMonth);
    const monthNum = parseInt(month) - 1;