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Technical reference
Parse and generate five-field Cron expressions, explain minute, hour, day, month, and weekday fields, and preview upcoming runs in a selected timezone. Results depend only on your device clock and timezone settings.
Five Cron fields
| Minute | 0-59, for example 15 |
|---|---|
| Hour | 0-23, for example 9 |
| Day of month | 1-31, for example 1 |
| Month | 1-12, for example 6 |
| Day of week | 0-7; 0 and 7 commonly mean Sunday |
Example: 9 AM on weekdays
This expression runs at 09:00 Monday through Friday in the selected timezone. Schedulers differ in weekday numbering, seconds fields, and combined day rules, so verify the target platform before deployment.
0 9 * * 1-5Compatibility and limits
- This tool parses standard five-field expressions, not Quartz seconds or year fields.
- Month lengths, daylight saving time, and server timezone settings can change actual execution.
- Parsing and next-run calculation happen in the browser; the tool does not create or trigger jobs.
Frequently asked questions
Should Sunday be 0 or 7 in Cron?
Many implementations accept both, but not all schedulers behave identically. Check the target platform documentation and test there.
Why does the preview differ from the server?
Timezone, daylight saving time, server clock, or scheduler-specific rules are common causes. The preview uses your selected timezone and device time.