Dev
Cron Expression Generator
Cron syntax is compact enough that a single transposed field can change a once-daily job into a once-per-minute one — and that mistake does not announce itself until logs start flooding. When you need a verified schedule expression, starting from a curated set where the expression and the English description are guaranteed to match is faster and safer than constructing one from scratch. This tool returns a random selection from 12 common, correct expressions paired with plain-English descriptions, such as "0 9 * * 1-5 — at 9:00 AM on weekdays" or "0 0 1 * * — on the first day of every month." The count input lets you pull 1 to 12 expressions at once. Because the pool has exactly 12 entries, requesting more than 12 caps at 12. Copy the expression that matches your need and paste it into your cron config, CI trigger, or scheduler. For custom schedules not in this list, use the expression as a structural reference and confirm the final result in a cron evaluator before deploying — timing bugs in production are silent and expensive.
How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Choose how many expressions you want.
- Click Generate to produce cron schedules.
- Copy the one that matches your need.
- Test custom schedules in a cron evaluator.
Use Cases
- •Scheduling a recurring backup or cleanup job
- •Setting up a CI or pipeline cron trigger
- •Configuring a scheduled report
- •Learning how cron syntax maps to timing
- •Copying a verified schedule expression
Tips
- →Read the five fields left to right.
- →Watch out for day-of-month vs day-of-week.
- →Test custom expressions before deploying.
- →Use the plain-English line to double-check.
FAQ
what do the five cron fields mean
From left to right they are minute, hour, day of month, month, and day of week. An asterisk means "every", and you can use steps like */5, ranges like 1-5, and lists. Together they define when a scheduled job runs.
how many expressions does this tool cover
The tool has a fixed pool of 12 common expressions covering intervals from every minute to once a year. Each expression is paired with an accurate English description, and results are sampled without replacement, so you can request up to 12 unique entries.
are these expressions correct
Yes — each expression is paired with a description that accurately states when it runs, so the schedule and its explanation always match. For unusual custom schedules, it is still wise to confirm with a cron evaluator before deploying.
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