Every minute
A crontab expression is five space-separated fields — minute, hour, day of month, month, and day of week — that tell a scheduler (cron, Kubernetes CronJobs, CI pipelines) when to run a job. Each field accepts a wildcard (*), a specific value, a range (1-5), a step (*/15), or a comma-separated list.
Pick a preset for common schedules, or fill in the fields directly — the plain-English description below updates as you type, so you can confirm the schedule means what you think it means before pasting it into a crontab file.
What does */15 mean in a cron field?
It's a step value meaning "every 15 units" — for the minute field, that's every 15 minutes (0, 15, 30, 45); the same syntax works on any field.
Does cron use my local timezone?
It depends on the system running the cron job — most Linux cron daemons use the system's configured timezone, while some platforms (like certain CI/CD or cloud schedulers) default to UTC, so always check your specific environment.
Can I combine a range and a step, like 1-10/2?
Yes — that combination is valid in standard cron syntax and means "every 2nd value between 1 and 10".