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A **CRON expression** is a string comprising 5 fields separated by white space that represents a set of times, normally as a schedule to execute some routine.

## Format

\* in the value field above means all legal values as in braces for that column.

The value column can have a \* or a list of elements separated by commas. An element is either a number in the ranges shown above or two numbers in the range separated by a hyphen (meaning an inclusive range).

## Examples

The following table shows several examples.