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What is a cron expression parser?

A cron expression parser translates a crontab schedule like "0 */4 * * *" into plain English ("every 4 hours, on the hour") and shows the next few run times. EasyRead supports the classic five-field Unix syntax plus the optional seconds field used by Quartz and many schedulers. Parsing happens in your browser, so you can check internal job schedules without sending them anywhere.

Common use cases

Sanity-checking a crontab

Paste an expression before adding it to crontab, a CI pipeline, or a Kubernetes CronJob to confirm it actually runs when you think it does.

Explaining a schedule in a PR

Copy the plain-English description into a code review so reviewers do not have to decode the fields themselves.

Previewing upcoming runs

See the next several execution times to verify edge cases like end-of-month, DST boundaries, or weekday-only schedules.

Debugging missed jobs

Compare the cron expression against when the job actually fired to figure out whether the schedule or the runner is at fault.

FAQ

What cron syntax does this support?

Standard Unix five-field cron (minute, hour, day-of-month, month, day-of-week) plus optional seconds for Quartz-style six-field expressions.

Are step and range values supported?

Yes. Steps (*/5), ranges (1-5), lists (MON,WED,FRI), and the @hourly/@daily/@weekly/@monthly/@yearly aliases all parse correctly.

How many upcoming runs do I see?

The next several execution times are shown so you can confirm behavior around month boundaries, leap days, and weekday constraints.

What timezone does the preview use?

Your local browser timezone. If your scheduler runs in UTC, mentally offset — or set your system to UTC temporarily when validating.

What does "0 0 * * *" mean?

Every day at midnight (00:00). Paste it in and the parser will describe it the same way.