Inputs
Cron
Supports standard 5-field cron expressions plus presets like @hourly, @daily, @weekly, @monthly, and @yearly. Results use your device's local timezone.
Result
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Result explanation
How to read this result
Visualization
103
Cron Calculator
Parse a cron expression and preview the next scheduled run times in your local timezone.
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Guide
Using the Cron Calculator
What the calculator does
This calculator parses a standard cron expression and previews the next future run times that match it.
It is useful when you are validating a schedule before you put it into a crontab, job runner, or automation system.
Formula and calculation explanation
Enter Cron expression, From date, and From time. Those values let the page parse a cron expression and preview the next scheduled run times in your local timezone.
The cron calculator breaks the schedule into five fields: minute, hour, day of month, month, and day of week.
Starting from the reference date and time you enter, it moves forward minute by minute and returns the first future timestamps that satisfy every active cron rule.
Real-world examples
- Use it to verify that a workday expression such as `0 9 * * 1-5` really fires on weekday mornings before you deploy a scheduled job.
- It is also useful for comparing how ranges, steps, and aliases change the next run times without editing a live crontab.
Step-by-step walkthrough
- Enter a standard 5-field cron expression or one of the supported macros such as @daily.
- Set the reference date and time you want to test against.
- Calculate to preview the next upcoming run times that satisfy the schedule.
- If the result is not what you expected, adjust one field at a time until the future run list matches your intent.
FAQs
Which cron format does this page support?
This calculator supports standard 5-field cron expressions plus the listed macros such as @hourly and @daily.
How are next run times calculated?
The page starts from the reference date and time you enter, moves forward, and returns the next future timestamps that satisfy every active cron rule.
Why might another scheduler disagree with this result?
Differences usually come from whether another tool counts endpoints, weekends, overnight spans, or timezone behavior differently.
Common mistakes
- Reversing the start and end values or forgetting that overnight spans may need special attention.
- Pasting a 6-field cron string into a calculator that expects the standard 5-field format.
- Changing several inputs at once, which makes it harder to see which variable actually moved the result.
Edge cases
- Invalid cron ranges, unsupported formats, or impossible field combinations will prevent the page from returning a schedule preview.
- Identical dates or times can produce a zero-length result, while reversed or overnight inputs may change how the span is interpreted.
- If a required field is left blank or contains an unsupported value, the calculator will not return a useful result until the input is corrected.
Interpretation of results
The main result shown here is next run. The calculator also returns following run, third run, timezone, and normalized so you can review the most useful supporting numbers at the same time.
- Text outputs usually describe the scenario or classification, so the wording matters as much as the numeric values around it.
- The supporting metrics help you understand why the headline result looks the way it does and which tradeoffs sit behind it.
- When you compare scenarios, change one key input at a time so you can tie each output change back to a specific assumption.
Related concepts and calculators
Related ideas for this page include intervals, calendar rules, scheduling, deadlines, business-day logic, and schedule expressions.