About this utility
How to use Cron Expression Explainer
Validate a five-field cron expression and calculate upcoming UTC run times.
What to provide
Use five fields: minute, hour, day of month, month, and day of week. Supports *, lists, ranges, and steps.
- Paste, type, or drag and drop a supported text file into the input area.
- Choose the options that match your intended result.
- Select “Run tool” or press Ctrl/Command + Enter, then copy, download, or move the result back into the first input for another pass.
What the result means
A field-by-field explanation and the next matching UTC times.
Privacy and safety
This utility is loaded as browser code and processes your input only in this tab. OmniCastConverter has no upload endpoint and never stores your content, filenames, tokens, or secrets. Generated markup and code are shown as inert text and are never executed.
Limitations
- Uses numeric five-field cron syntax in UTC; named months, named weekdays, seconds, Quartz extensions, and host-specific macros are not supported.
Try the included example
Select “Load example” at any time to restore this tested sample.
*/15 9-17 * * 1-5