How to use the Cron Expression Parser
1. Enter any cron expression in the input field (5 fields separated by spaces).
2. The next 10 scheduled run times appear instantly in your local timezone.
3. If the expression is invalid, no results are shown.
What is it?
Parsing cron expressions is essential for verifying that scheduled jobs will run at the intended times. A wrong cron expression can cause jobs to never run, run too often, or run at unexpected times — leading to data loss, billing issues, or system overload.
This parser calculates the next 10 occurrences of the schedule, allowing you to quickly verify the expression before deploying. It supports standard cron syntax including wildcards, ranges, steps, and lists.
Example
*/15 9-17 * * 1-5
Every 15 minutes, between 09:00 and 17:00, Mon–Fri Next runs: Mon 09:00 · Mon 09:15 · Mon 09:30 · Mon 09:45 · Mon 10:00
Paste cron expressions from your CI/CD pipeline, AWS EventBridge, or crontab file to verify the schedule.
Benefits
Understand any cron expression by seeing its actual run times
Paste a cron expression and see the next 20+ scheduled execution times in plain language — no mental parsing required.
Debug a misfiring scheduled job by checking its intended schedule
Compare the expected schedule from the expression to actual execution logs to find the source of the discrepancy.
Translate inherited or undocumented cron expressions instantly
Legacy crons in old codebases rarely have comments — see exactly what they schedule without needing to run them.
Verify third-party cron expressions before deploying them
Confirm a schedule from documentation or a tutorial fires at the correct times before adding it to your system.
Frequently asked questions
My cron job uses 6 fields — is that supported?
Some platforms add a seconds field at the start or a year field at the end. This tool uses the standard 5-field Unix cron format: minute hour dom month dow.
Why are times shown in my local timezone?
The tool shows times in your local timezone for readability. Most cron schedulers run in UTC — convert accordingly when setting up server-side jobs.