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cron 23:00                 # every day at 23:00
cron 08:00 12:00 01:00     # every hour between 8 and 12
cron -w 0,2    11:00       # every sunday and tuesday at 11 am
cron -d 1,15   02:00       # every 1st and 15th of each month at 2 am
cron -m 1 -d 1 14:00       # every first of January at 2 pm
cron -w 5L 23:00           # run on *last* Friday(5L) of each month at 23pm
cron -d 1,L  23:00

When the time has expired, the associated node is free to run. The time will stay expired until the node is re-queued.

date 31.12.2012             # 

task tt
   day monday   # Here Day/date acts like a guard over the time. i.e. time is not considered until Monday
   time 10:00   # run on Monday at 10 am

task tt
   day sunday                  # On the same node, Day/date act like a guard over the time attributes.
   day wednesday
   date 01.*.*                 # The first of every month and year
   date 10.*.*                 # The 

family fam2
   time 10:00
   task tt
       day monday # This will run on Monday morning at 00:00 and Monday at 10 am

import os
from ecflow import Defs,Suite,Family,Task,Edit,Trigger,Complete,Event,Meter,Time,Day,Date,Edit

def create_family_f2():
    return Family("f2",
            Edit(SLEEP=20),
            Task("t1", Time("00:30 23:30 00:30")),     # start(hh:mm) end(hh:mm) increment(hh:mm)
            Task("t2", Day("thursday"),Time("13:00")),
            Task("t3", Date("1.*.*"), Time("12:00")),  # Date(day,month,year) - * means every day,month,year
            Task("t4", Time("+00:02")),                # + means realative to suite begin/requeue time
            Task("t5", Time("00:02")))                 # 2 minutes past midnight
 
print("Creating suite definition")  
home = os.path.join(os.getenv("HOME"), "course")
defs = Defs( 
        Suite("test",
            Edit(ECF_INCLUDE=home,ECF_HOME=home),
            create_family_f2()
            ))
print(defs) 

print("Checking job creation: .ecf -> .job0")  
print(defs.check_job_creation())

print("Checking trigger expressions")
errors = defs.check()
assert len(errors) == 0,errors

print("Saving definition to file 'test.def'")
defs.save_as_defs("test.def")