Cron Syntax

A cron expression has five space-separated fields: minute (0–59), hour (0–23), day of month (1–31), month (1–12), and day of week (0–6, Sunday = 0). This cron expression calculator parses the expression, validates it, and computes the exact next run times.

Wildcards, Ranges, and Steps

* matches every value · 1-5 matches a range · 1,15 matches a list · */15 matches every 15th value · 1-30/5 matches 1, 6, 11, 16, 21, 26. Common examples: '0 0 * * *' daily at midnight, '*/10 * * * *' every 10 minutes, '0 2 * * 0' every Sunday at 2 AM.

Day-of-Month and Day-of-Week

Standard cron treats a match as running when either the day-of-month OR day-of-week condition matches, unless one field is an asterisk — in which case the other field governs. Verify your intent: '0 0 1 * 1' runs on the 1st of the month AND on every Monday.