📅 Crontab Visual Calendar
Visualize and explain cron expressions in plain English. See the next 10 scheduled run times. Paste any cron string to instantly understand it. Free online cron expression visualizer.
Next 10 Runs
Calendar
How to Use
1
Enter a cron expression
Type any 5-field cron expression (e.g. 0 9 * * 1) or select a preset from the dropdown.
2
Read the description
The plain-English description updates instantly so you can verify the expression means what you intend.
3
View the calendar
The next 10 run times and monthly calendar heatmap show exactly when the job will execute.
Frequently Asked Questions
What does this tool show?
Enter any cron expression (5 fields: minute hour day month weekday) and the tool shows: a human-readable description, the next 10 scheduled run times with exact dates, and a monthly calendar view with heatmap highlighting on days the job would run.
What cron expression formats are supported?
Standard 5-field cron expressions: * (any), */n (every n), ranges (1-5), lists (1,3,5), and combinations. Special strings like @hourly, @daily, @weekly, @monthly, @yearly are also supported.
How is the heatmap useful?
The calendar heatmap shows job density visually — darker cells mean more runs that day. For example, */15 * * * * (every 15 min) shows every day darkly shaded, while 0 9 * * 1 (every Monday 9am) shows only Mondays highlighted.
What timezone are the run times shown in?
Run times are calculated in your local browser timezone. The timezone is shown alongside the run time list so you know which timezone is being used.
What is the difference between this and the Cron Generator?
The Cron Generator helps you build a cron expression using a visual form. This Cron Visualizer takes an existing expression and shows you exactly when it will run — complementary tools for different parts of the workflow.
完整指南：Cron表达式可视化工具
什么是Cron表达式？
Cron表达式有5个字段：分钟 小时 日期 月份 星期。很难阅读——*/15 9-17 * * 1-5（工作日9-17点每15分钟）需要练习才能一眼理解。此工具将其翻译为自然语言。
如何使用
- 粘贴Cron表达式到输入字段。
- 阅读自动生成的自然语言描述。
- 查看接下来的执行时间。
专业技巧
0 0 * * *=每天午夜；*/5 * * * *=每5分钟。- 始终在任务调度系统中指定时区，避免夏令时带来的意外。
- 使用Cron生成器从头创建表达式。