Cron expressions, fields, and timezones
How a five-field cron expression is written, what the next-run preview means, and which dialects this builder does not speak.
Five fields, in order
The expression minute hour day-of-month month day-of-week is the dialect used by many Linux crontabs. 0 9 * * 1-5 is 09:00 on Monday through Friday. A star means every legal value of that field. Sunday is 0, and 7 is also Sunday.
Quartz schedules often add a seconds field at the front and sometimes a year at the end. Pasting those six or seven fields into this builder is rejected so the extra field is not silently read as a minute.
The expression does not contain a timezone
A crontab runs in whatever timezone the scheduler is configured to use. The preview lets you apply UTC, the browser timezone, or a named zone such as America/New_York. Changing the zone changes the displayed clock times, not the five fields.
When both the day of month and the day of week are constrained, standard cron usually treats them as OR. Use the next-run list to see the instants the parser actually produces.