Cron Date / Time Format
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The Cron format allows you to define time and frequency for tasks efficiently; it is more flexible than picking a date and time from a calendar but almost as simple.
The classic format consists of five fields separated by a space: <Minute> <Hour> <Day of the Month> <Month of the Year> <Day of the Week>. The extended version adds a sixth: <Minute> <Hour> <Day of the Month> <Month of the Year> <Day of the Week> <Year>.
Any field may contain a list of values separated by commas, (e.g. 1,3,7) or a range of values (two integers separated by a hyphen, e.g. 1-5).
The asterisk (*) - defining the complete range for any field - is allowed for all fields, while the question mark (?) can only be used in the first four fields.
After an asterisk or a range of values, you can use the slash (/) to specify repeating values (see below for an example).
Note: For <Month> and <Day of the Week> you can use the English short names instead of numbers (Jan, Feb,...,Dec; Mon,Tue,...,Sun).