Provides a simplified subset of the time expression part of the V7 cron expression standard.
Expressions are in the format:
[minute] [hour] [day of month] [month] [day of week]
field allowed values
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sun, or use names)
Month names are the three first letters, case insensitive: jan, feb etc.
Day names are the three first letters, case insensitive: mon, tue, wed
Both month and days can be defined with numbers as well, months starting with 1 for january
and days 0 for sunday up until 7 for sunday again.
Star '*' means minimum to maximum value (or all values)
Intervals can be defined like this '*\/20' which would mean "every twentieth".
Multiple values can be listed comma separated: '10,20,30'