// parse cron syntax and preview upcoming scheduled executions
Parse cron expressions and preview the next scheduled executions instantly. Supports standard 5-field and 6-field cron syntax with human-readable output.
Ready to calculate
Enter a cron expression and click CalculateType a 5-field cron expression (minute hour day month weekday) or pick from the preset buttons.
Choose your target timezone and how many upcoming runs you want to preview.
Click Calculate to see all upcoming execution times with human-readable descriptions and intervals.
The Cron Next Run Calculator parses standard cron expressions and computes upcoming execution timestamps. It handles all valid cron syntax including step values (*/5), ranges (1-5), lists (1,3,5), and wildcards (*).
A cron expression is a string of 5 fields separated by spaces that define a schedule: minute hour day-of-month month day-of-week. For example, 0 9 * * 1-5 means "9:00 AM every weekday".
Standard 5-field cron syntax is fully supported, including: wildcards (*), step values (*/5), ranges (1-5), and lists (1,3,5). Special strings like @daily and @hourly are also recognized.
All times are calculated from the current moment and displayed in the selected timezone. The timezone only affects how times are displayed — the underlying schedule logic is computed in UTC and then converted.
The 5 fields are: Minute (0–59), Hour (0–23), Day of month (1–31), Month (1–12), Day of week (0–7, where 0 and 7 are Sunday). Each field can be a number, range, list, or step.
No. All parsing and calculation happens entirely in your browser using JavaScript. No data is transmitted to any server — it's 100% private and works offline once the page loads.
Yes. The tool supports common shortcuts: @yearly / @annually (Jan 1), @monthly (1st of month), @weekly (Sunday midnight), @daily / @midnight (midnight), and @hourly.
A Cron Next Run Calculator is a developer tool that interprets cron expressions and computes the exact timestamps when a scheduled job will execute next. Rather than mentally tracing through cron syntax, developers can instantly verify that their schedules are configured correctly before deployment.
Cron jobs are the backbone of automated scheduling on Linux and Unix systems. They power everything from database backups and log rotation to email campaigns and API polling. But cron syntax can be deceptively tricky — a small typo can mean a job runs every minute instead of once a day, or not at all.
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The standard cron expression consists of five space-separated fields, each controlling a different time dimension:
A wildcard * in any field means "every" — so * * * * * fires every single minute. This is the simplest cron expression and a common starting point when testing.
Beyond basic numbers and wildcards, cron supports several powerful operators:
1,3,5 means the 1st, 3rd, and 5th1-5 means every value from 1 through 5*/15 means every 15 units, 0-30/10 means 0, 10, 20, 30These can be combined. For example, 0,30 9-17 * * 1-5 runs at 9:00, 9:30, 10:00, 10:30... up to 17:30 on Monday through Friday.
Here are some of the most frequently used cron patterns in production systems:
* * * * * — Every minute (often used for health checks or polling)*/5 * * * * — Every 5 minutes (lightweight periodic tasks)0 * * * * — Every hour on the hour0 0 * * * — Daily at midnight (database backups, log archiving)0 9 * * 1-5 — Weekdays at 9 AM (business hour reports)0 0 * * 0 — Weekly on Sunday at midnight0 0 1 * * — First day of every month0 0 1 1 * — Once a year on January 1stMany cron implementations support shorthand keywords as alternatives to the 5-field syntax:
@yearly or @annually — Equivalent to 0 0 1 1 *@monthly — Equivalent to 0 0 1 * *@weekly — Equivalent to 0 0 * * 0@daily or @midnight — Equivalent to 0 0 * * *@hourly — Equivalent to 0 * * * *These are supported in modern cron implementations including crontab on Linux, as well as frameworks like Laravel's task scheduler and Node.js cron libraries.
Even experienced developers occasionally misconfigure cron schedules. A calculator like this catches errors before they reach production by showing you exactly when the job would run. This is especially valuable for:
While the cron daemon originated in Unix, the concept has spread across every major development ecosystem. Laravel uses Artisan commands with cron-like schedules. GitHub Actions, AWS CloudWatch Events, Google Cloud Scheduler, and Azure Logic Apps all use cron expressions for timed triggers. Kubernetes CronJobs use the same 5-field format. Node.js libraries like node-cron and cron implement the same syntax.
Understanding cron deeply remains one of those foundational DevOps skills that pays dividends across every platform and cloud provider.
A few guidelines that prevent the most common production incidents with cron jobs: Always test with a calculator before deploying. Use comment lines in your crontab (# runs every 5 minutes) to document intent. Be cautious with month-end day values. Consider using @hourly keywords instead of 0 * * * * for readability. And always verify timezone behavior, especially across DST transitions.