Cron builder and explainer

Build or inspect five-field cron expressions with UTC examples.

How it works and limits

Numeric five-field cron: wildcards, lists, ranges and steps. No seconds, year, names, @macros, L, W, ? or # syntax. Both restricted day fields use OR; otherwise both must match. Next five UTC matches are searched within one year. No timezone/DST simulation or scheduling occurs. Verify your scheduler’s dialect before use.

Worked example

action: Build from fields
minute: */15
hour: 9-17
day: *
month: *
weekday: 1-5
source:

Inputs start empty. Load example fills them only when you choose it. Reset clears inputs and results.

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Cron builder and explainer

Source

Output