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Cron has been extended to support 'last day of the month' and last week day of the month in ecflow 5

Lets recap the structure of a cron attribute:

cron -w <weekdays> -d <days> -m <months> [ time || <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

Remember we *AND* across -w, -d, -m  then   *OR* for each element in -w, -d,-m

The new cron format will  use L,  to represent Last day of the month, or last week day of the month.

Hence we now support:

  • -w day of the week.   valid values are , 0 → 6 where 0 is Sunday , 1 is Monday etc AND
                                                                      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   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
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  and *OR* for each element in -w, -d,-m

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])