Cron has been extended to support the 'last day of the month' and last week day weekday of the month.
Lets Let's recap the structure of a cron attribute:
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cron -w<int_list>w <weekdays> -d <int_list><days> -m<int_list>m <time> time = single<months> [ time slot *OR* time series int_list = comma separated integer list, see below for list of valid values |
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|| <start_time> <end_time> <increment> ]
# weekdays: range [0...6], Sunday=0, Monday=1, etc e.g. -w, 0,3,6
# days: range [1..31] e.g. -d 1,2,20,30 if the month does not have a day, i.e. February 31st it is ignored
# months: range [1..12] e.g. -m 5,6,7,8
# time: The starting time. format hh:mm e.g. 15:21
# start_time: The starting time. format hh:mm e.g. 15:21
# end_time: The end time, if multiple times used
# increment: The increment in time if multiple times are given
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Remember we *AND* across -w, -d, -m or m then *OR* for each element in -w, -d,-m
The new cron format will will use L, to represent the Last day of the month , or last week day weekday of the month.
Hence we now support:
- -w day of the week week. valid values are, 0 → 6 where 0 is Sunday, 1 is Monday, etc AND
0L→6L 0L→6L, where 0L means last Sunday of the month, and 1L means the last Monday of the month, etc
It is an error to overlay, i.e. cron -w 0,1,2,1L,2L,3L 3L 23:00 will throw an exception - -d day of the month, valid values are in range 0-31,L Extended so that we now use 'L' to mean the last day of the month
- -m month valid values are in range 0-12
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cron -w 5L 23:00 # run on *last* Friday(5L) of each month at 23pm, # Python: cron = Cron("23:00",last_week_days_of_the_month=[5]) cron -w 0,1L 23:00 # run every Sunday(0) and *last* Monday(1L) of the month at 23pm # Python: cron = Cron("23:00",days_of_week=[0],last_week_days_of_the_month=[1]) cron -w 0L,1L,2L,3L,4L,5L,6L 10:00 # run on the last Monday,Tuesday..Saturday,Sunday of the month at 10 am # Python: cron = Cron("10:00",last_week_days_of_the_month=[0,1,2,3,4,5,6]) cron -d 1,L 23:00 # Run on the first and last of the month at 23pm # Python: cron = Cron("23:00",days_of_week=[1],last_day_of_the_month=True) |
The cron Late attribute can also be combined: Remember we *AND* across -w, -d, -m or m and *OR* for each element in -w, -d,-m
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cron -w 4L -d L 10:00 # run on the last Thursday(4L) of the month *AND* Last of day of the month, this only occurs 3 times in a year in 2019 # Python: cron = Cron("10:00",last_week_days_of_the_month=[4],last_day_of_the_month=True) cron -w 0,1L -m 1 10:00 # run every Sunday(0) and last Monday(1L) of the month, in January at 10am # Python: cron = Cron("10:00",days_of_week=[0],last_week_days_of_the_month=[1],months=[1]) |