Guide
About this cron expression tester
The cron tester parses traditional five-field cron expressions, explains the schedule in plain English, and calculates the next seven run times in a selected timezone. It supports lists, ranges, steps, month and weekday names, and common macros such as @daily.
How to use the cron expression tester
- 1.Enter a five-field expression in minute, hour, day-of-month, month, and day-of-week order.
- 2.Choose the timezone used to preview the schedule.
- 3.Review each parsed field, the plain-language explanation, and the upcoming run times.
Important details
Cron implementations differ
This tester uses the common five-field format. Quartz, AWS EventBridge, Kubernetes, systemd timers, and vendor schedulers may use a seconds or year field, different weekday numbering, or special characters that this parser does not support.
Timezone and daylight-saving behavior
A local wall-clock time may occur twice or not at all during a daylight-saving transition. Confirm the scheduler’s configured timezone and DST behavior before relying on a production schedule.
Frequently asked questions
Does this tester run a job?
No. It parses and previews a schedule only; it does not register or execute tasks.
Why does my six-field cron expression fail?
This parser expects five fields and does not include a leading seconds field. Remove it only if the target scheduler also uses five-field cron syntax.