Cron Expression Parser
Parse and explain cron expressions in plain English. See the next scheduled run times for any cron schedule.
Features
- ✓Parse any standard 5-field cron expression instantly
- ✓Get a human-readable explanation in plain English
- ✓See the next 5 scheduled run times from now
- ✓View a breakdown of each cron field with its meaning
- ✓Quick-click presets for common schedules
- ✓Works offline — your expressions never leave your browser
How to Use
- 1Enter a cron expression in the input field (e.g., */15 * * * *)
- 2Or click a preset button to load a common schedule
- 3Read the plain-English description of what the expression does
- 4Review the field-by-field breakdown table
- 5Check the next 5 scheduled run times
Examples
Input
*/15 * * * *
Output
Every 15 minutes
Input
30 3 * * *
Output
At 3:30 AM
Input
0 9 * * 1-5
Output
At 9:00 AM, on Monday through Friday
Input
0 0 1 * *
Output
At 12:00 AM, on day 1 of the month
What is a Cron Expression?
A cron expression is a string of five fields separated by spaces that defines a schedule for recurring tasks. Originally part of Unix-like operating systems, cron is now used everywhere — from Linux servers and CI/CD pipelines to cloud schedulers like AWS CloudWatch, Google Cloud Scheduler, and Kubernetes CronJobs.
Each of the five fields represents a time unit: minute (0–59), hour (0–23), day of the month (1–31), month (1–12), and day of the week (0–6, where 0 is Sunday). A wildcard (*) means "every possible value," a slash (/) defines a step interval, a dash (-) defines a range, and a comma (,) separates a list of specific values.
For example, the expression "30 3 * * *" means "at minute 30 of hour 3, every day, every month, every weekday" — in plain English, "every day at 3:30 AM." The expression "0 9 * * 1-5" means "at 9:00 AM, Monday through Friday." These compact strings pack a lot of scheduling power into very few characters.
Parsing cron expressions by hand is error-prone, especially with complex combinations of ranges, steps, and lists. A cron parser translates the expression into a human-readable description and calculates the next execution times, so you can verify your schedule before deploying it. This avoids costly mistakes like a backup job running every minute instead of every hour.
This tool supports the standard five-field cron format used by crontab, systemd timers, and most scheduling libraries. It accepts numeric values, ranges (1-5), steps (*/10), lists (1,3,5), and month/weekday names (MON, JAN). Paste any expression and instantly see what it does and when it will run next.