⏰ Cron Expression Generator
Build cron expressions visually with a form-based editor. Set minute, hour, day, month, and weekday fields. Preview next run times. Free online cron expression generator.
0–59
0–23
1–31
1–12
0–7
* * * * *
Every minute
How to Use
1
Choose a preset or configure
Pick a common schedule preset (every minute, hourly, daily, weekly, monthly) or configure each field individually.
2
Read the live description
The cron expression and its plain-English description update instantly as you change any field.
3
Copy and deploy
Click Copy Expression to copy the cron string to your clipboard for use in crontab, cloud schedulers, or CI/CD.
Frequently Asked Questions
What is a cron expression?
A cron expression is a string used to define schedules for automated tasks (cron jobs). It has 5 fields: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7). For example, "0 9 * * 1" means "every Monday at 9:00 AM".
What does * (asterisk) mean in a cron expression?
* means "every" for that field. "* * * * *" means "every minute of every hour of every day". You can use */n for intervals — "*/15 * * * *" means "every 15 minutes".
What is the difference between day of month and day of week?
Day of month (field 3) schedules tasks on specific dates like the 1st or 15th. Day of week (field 5) schedules on specific days like Monday or Friday. Using both fields in the same expression means "on this date OR this weekday" (OR, not AND).
How do I run a cron job every 5 minutes?
Use "*/5 * * * *" — the */5 in the minute field means "every 5 minutes". Similarly, "*/30 * * * *" runs every 30 minutes, and "0 */2 * * *" runs every 2 hours at the top of the hour.
Can I test if my cron expression is correct?
Yes — this generator shows a human-readable description of your cron expression in real-time, so you can immediately see if your schedule matches your intention before adding it to your server.
Guía: Constructor Visual de Cron
¿Qué es?
Ayuda a crear expresiones cron mediante una interfaz visual sin necesidad de memorizar la sintaxis. Seleccionas frecuencia y horario con controles, y la herramienta genera la expresión correcta.
Cómo usar
- Selecciona la frecuencia: cada minuto, hora, día, semana, mes.
- Configura detalles: qué minuto, hora, días.
- Copia la expresión y verifica en el visualizador de cron.
Consejos
- Especifica la zona horaria en UTC para evitar problemas con horario de verano.
- Evita las :00 exactas — muchos sistemas tienen picos de carga en esos momentos.
- Para tareas críticas, añade monitorización (dead man's switch).