Cron Expression Builder
Start from a preset, edit the five fields or paste an expression. You see what it means field by field and when it runs next, in your time zone and in UTC.
FIELDS
RESULT
Minute: 0 · Hour: 9 · Day of month: any · Month: any · Weekday: Mon–Fri
NEXT 5 RUNS
Runs entirely in your browser. Nothing you enter is sent to a server.
How to build a cron expression
Start from a preset
Pick a common schedule such as every 15 minutes or weekdays at 09:00, or paste an expression you already have.
Adjust the fields
Edit minute, hour, day of month, month and weekday, or click the weekday buttons. Each field accepts *, lists, ranges and steps.
Check the next runs
Read the summary and the next 5 run times, then copy the expression into your crontab, CI pipeline or scheduler.
The five fields
A cron expression is minute (0–59), hour (0–23), day of month (1–31), month (1–12 or JAN–DEC) and weekday (0–7 or SUN–SAT, where 0 and 7 are Sunday). * means any value, 1,15 is a list, 9-17 a range and */15 a step. The shortcuts @hourly, @daily, @weekly, @monthly and @yearly are accepted too.
Which time zone?
Cron uses the time zone of the machine it runs on, and many servers and cloud schedulers use UTC. Choose whether the schedule is read in your time zone or in UTC; every run is shown in both. Times skipped by a daylight saving change are left out.
Frequently asked questions
What happens if I set both a day of month and a weekday?
As in standard cron, the job runs when either one matches. 0 9 13 * 5 runs at 09:00 on the 13th of every month and on every Friday, not only on Friday the 13th.
Can I use seconds or years?
No. This builder follows the standard 5-field format used by crontab and most schedulers. Quartz and some other tools add a seconds or year field, which isn't supported here.
Is anything sent to a server?
No. The expression is read and the run times are calculated in your browser.