Free online tool

Cron Explainer with Time Zones and DST

Explain cron expressions and calculate future runs in an IANA time zone

Cron schedule

Five-field cron expressionminute · hour · day of month · month · day of week

Time calculation

IANA time zone

Start after this browser-local time

Future runs

Meaning

#	Run in selected time zone	UTC	UTC offset	DST / offset note

This tool follows common Unix cron behavior: when both day-of-month and day-of-week are restricted, a date matches if either field matches. Some schedulers use different rules or handle repeated/missing DST wall times differently.

Cron expression explainer with time zones

Parse standard five-field cron syntax including wildcards, lists, ranges and steps. Month and weekday names such as JAN or MON-FRI are supported. Future run times are calculated entirely in the browser using its built-in IANA time-zone database.

Nonexistent local times during the spring DST transition are skipped. Repeated local times during the autumn transition can appear twice with different UTC offsets. Always verify the semantics of the actual cron service, framework or hosting control panel where the job will run.