Cron Expression Parser

Every minute* * * * * Every hour0 * * * * Every day at midnight0 0 * * * Weekdays at 9 AM0 9 * * 1-5 Every Sunday0 0 * * 0 First of month0 0 1 * * Every 15 minutes*/15 * * * * Every year (Jan 1)0 0 1 1 *