Python relative date handling routine. Useful for scheduling daily, weekly and monthly reports.

relative_dates.py

from datetime import datetime
from dateutil.relativedelta import *

FIRST_DAY = 1
LAST_DAY = 31
TODAY = datetime.combine(datetime.today(), datetime.min.time())

#args_string = '@months=-1,weekday=MO(-1),hour=12'
args_string = '@months=-1,day=LAST_DAY,hour=12'

if args_string[0] == '@':
    args = dict(arg.split('=') for arg in args_string[1:].split(','))
    args = {key: eval(value) for key, value in args.items()}
    fixed_date = TODAY + relativedelta(**args)
    print(fixed_date.strftime('%Y-%m-%d %H:%M:%S'))