Build cron expressions visually — set minute, hour, day, month, weekday, see plain-English output, preview next 10 run times, and switch between Linux/GitHub Actions/AWS formats.
Fill in the fields or paste your input text. Click Sample to load an example and see the tool in action.
Press the main button to process your input. Results appear instantly — all processing runs in your browser, no upload needed.
Check the output panel. Any errors are shown in a red bar with a clear description so you can fix the input quickly.
Click Copy to copy to clipboard, or Download to save the result as a file.
A cron expression is a string of 5 space-separated fields (minute, hour, day of month, month, day of week) that defines when a scheduled task should run. For example, "0 9 * * 1" means "every Monday at 9:00 AM".
Field 1: Minute (0–59). Field 2: Hour (0–23). Field 3: Day of month (1–31). Field 4: Month (1–12). Field 5: Day of week (0–7, where both 0 and 7 = Sunday). An asterisk (*) means "every".
"*/5" means "every 5 units". So "*/5" in the minute field means "every 5 minutes". "*/2" in the hour field means "every 2 hours". This is called step notation.
GitHub Actions uses the same 5-field syntax as standard Linux cron, but it always runs in UTC and has a minimum interval of about 5 minutes. The generated expression is identical — only the environment differs.
AWS CloudWatch Events / EventBridge uses a 6-field cron syntax with an additional Year field, and uses ? instead of * for "any". This tool generates the correct format for each platform.
Standard Linux cron supports 1-minute intervals. GitHub Actions has an effective minimum of ~5 minutes. AWS EventBridge supports 1-minute intervals. Shorter intervals require a different scheduling system.
