First workday of month (except holidays)

TrustyTony 1 4K Views

This code determines if datetime object represent first workday of month, but it does not consider the special days like New Year (this year weekend but last year Friday).

Reaction to Basic efforts in: http://www.daniweb.com/software-development/legacy-and-other-languages/threads/362098

There algorithm idea given by jon.kiparsky

based docstring says 'workday' when it should be 'weekday':

''' Determine first workday based on day of month and weekday (0 == Monday) '''
from datetime import datetime

def first_workday(theday):
    ''' Determine first workday based on day of month and workday (0 == Monday) '''
    return ((theday.day == 3 and theday.weekday() == 0) or
            (theday.day == 2 and theday.weekday() == 0) or
            (theday.day == 1 and theday.weekday() < 5))


for test in (datetime.today(), datetime(2011, 5, 2), datetime(2010, 5, 2), datetime(2011, 5, 1),
             datetime(2011, 4, 1), datetime(2011, 3, 1), datetime(2011, 1, 1), datetime(2012, 9, 1),
            datetime(2012, 9, 3), datetime(2010, 1, 1)): # wrong as New Year is Holiday
        print 'The day is' + ('' if first_workday(test) else ' not'), 'first workday:',  test.strftime('%Y/%m/%d, %A')
    
'''Output:
The day is not first workday: 2011/05/07, Saturday
The day is first workday: 2011/05/02, Monday
The day is not first workday: 2010/05/02, Sunday
The day is not first workday: 2011/05/01, Sunday
The day is first workday: 2011/04/01, Friday
The day is first workday: 2011/03/01, Tuesday
The day is not first workday: 2011/01/01, Saturday
The day is not first workday: 2012/09/01, Saturday
The day is first workday: 2012/09/03, Monday
The day is first workday: 2010/01/01, Friday
'''
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vegaseat 1,735 DaniWeb's Hypocrite
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TrustyTony 888 ex-Moderator

Using date and one less or branch (using in), if you feel five and/ors and six comparisons are too much:

from datetime import date

def isfirst_workday(theday):
    ''' Determine first workday based on day of month and weekday (0 == Monday) '''
    return ((theday.day in (2,3) and theday.weekday() == 0) or
            (theday.day == 1 and theday.weekday() < 5))

if __name__ == '__main__':
    for test in (date.today(), date(2011, 5, 2), date(2010, 5, 2), date(2011, 5, 1),
             date(2011, 4, 1), date(2011, 3, 1), date(2011, 1, 1), date(2012, 9, 1),
            date(2012, 9, 3), date(2010, 1, 1)): # wrong as New Year is Holiday
        print 'The day is' + ('' if isfirst_workday(test) else ' not'), 'first workday:',  test.strftime('%Y/%m/%d, %A')
    
'''Output:
The day is not first workday: 2011/05/07, Saturday
The day is first workday: 2011/05/02, Monday
The day is not first workday: 2010/05/02, Sunday
The day is not first workday: 2011/05/01, Sunday
The day is first workday: 2011/04/01, Friday
The day is first workday: 2011/03/01, Tuesday
The day is not first workday: 2011/01/01, Saturday
The day is not first workday: 2012/09/01, Saturday
The day is first workday: 2012/09/03, Monday
The day is first workday: 2010/01/01, Friday
'''
Edited by TrustyTony because: n/a
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