What does */5 mean in a cron expression?

The */5 syntax means 'every 5th unit'. In the minutes field, */5 means every 5 minutes (0, 5, 10, 15...). In the hours field, */5 would mean every 5 hours.

How do I test a cron expression before deploying?

Use FreeDevKit's Cron Generator tool to enter any expression and see exactly when it will run next. It shows the next 5 execution times so you can verify the schedule is correct.

What's the difference between cron and crontab?

Cron is the scheduling daemon that runs tasks. Crontab (cron table) is the file where you define your scheduled tasks. 'crontab -e' opens the editor to add or modify schedules.

How do I avoid timezone mistakes?

Always confirm whether the platform uses UTC or a local timezone, then test the next run times before shipping the schedule.

What is the safest way to learn cron syntax?

Start from common examples like every minute, daily, or weekly, then move to more specific expressions once the basics feel familiar.

Should I test cron before deploying?

Yes. Checking the next execution times is the fastest way to catch a schedule that looks right but fires at the wrong moment.

25 Cron Job Examples Every Developer Needs — From Basics to Advanced

Every N Minutes

The most common cron schedules run tasks at regular intervals. Every minute uses `* * * * *`. Every 5 minutes uses `*/5 * * * *`. Every 10 minutes uses `*/10 * * * *`. Every 15 minutes uses `*/15 * * * *`. Every 30 minutes uses `*/30 * * * *`.

Hourly and Daily Schedules

Every hour uses `0 * * * *`. For daily tasks: daily at midnight uses `0 0 * * *`, daily at 9am uses `0 9 * * *`, and daily at noon uses `0 12 * * *`. Need it twice a day? Twice daily uses `0 0,12 * * *`.

Weekly Schedules

For weekly tasks: every Monday uses `0 0 * * 1`, every Friday uses `0 0 * * 5`. Business schedules: weekdays at 9am uses `0 9 * * 1-5`, weekdays every 30 minutes during work hours for high-frequency business tasks.

Monthly and Yearly

Less frequent schedules: first of every month uses `0 0 1 * *`, 15th of every month uses `0 0 15 * *`. For annual tasks: yearly on January 1st uses `0 0 1 1 *`. Quarterly schedules use `0 0 1 1,4,7,10 *`.

Platform-Specific Tips

Different platforms have different cron syntax nuances. Check our guides for GitHub Actions cron, AWS CloudWatch cron, and Kubernetes CronJobs. Each platform has its own quirks around timezone handling and minimum intervals.

How to Use Cron Without Memorizing Everything

The easiest way to work with cron is to start from a human phrase like daily, weekly, or every 10 minutes, then generate the exact expression from there. That keeps you from memorizing syntax you only use occasionally while still giving you a precise schedule you can copy into your project.

When Cron Errors Usually Happen

Cron mistakes are often caused by field order, timezone assumptions, or choosing a schedule that is valid syntactically but wrong for the real job. A generator helps by giving you a known-good expression and a more visible way to inspect timing before deployment.