Cron 表达式解析器

What Is Cron Expression Parser?

Cron Expression Parser is a free online tool that translates cron expressions into plain-English descriptions and shows the next 5 scheduled run times. Cron is a time-based job scheduler used in Unix-like systems to automate recurring tasks — from database backups to report generation. This tool helps developers write, debug, and verify cron schedules without memorizing the syntax.

How to Use Cron Expression Parser

1. Type a cron expression into the input field, or click a preset to load a common schedule.
2. The tool explains the schedule in plain English instantly.
3. The next 5 run times are listed with relative countdowns.

Cron Expression Format

• 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: 0–6 (0 = Sunday)
• * = every value, */n = every n values, a-b = range, a,b = list

FAQ

What is a cron expression?

A cron expression is a string of 5 fields (minute, hour, day-of-month, month, day-of-week) that defines a recurring schedule for automated tasks on Unix-like systems.

What does */5 mean in a cron expression?

*/5 means "every 5 units". For example, */5 in the minute field means the job runs every 5 minutes.

How many fields does a standard cron expression have?

A standard cron expression has 5 fields: minute (0–59), hour (0–23), day of month (1–31), month (1–12), and day of week (0–6, where 0 is Sunday).