This gives the week day you were born based on your birthdate. (mm-dd-yy)

birthdate.py

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Find the week day you were born on based on your birthdate (mm-dd-yyy)
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gistfile1.pyPython
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import sys
# Find day of week of birthdate
 
# call birthdate mm-dd-yy format
 
#  Used to check the digits on the input birthay to determine if the layout works
# def Birth_day(date) :
  # mm = int(date[0:2])
  # dd = int(date[3:5])
  # yy = int(date[6:])
 
  # return mm, dd, yy
 
  #Calculates the first portion of the doomsday calculation 
	#that feeds into Year_step_2
def Year_step_1(date):
  yy = int(date[8:])
  if yy%2 == 0:
    div_date = yy/2
  else:
    div_date = (yy+11)/2
  return div_date
  #This portion of code determines how many days off from the Standard
	#doomsday the year in question is.  All years in the 1900s have a base doomsday
	#of Wednesday, all 2000's have a base doomsday of Thursday.
def Year_step_2(date):
  div_date = Year_step_1(date)
  if div_date%2 == 0:
    mod_date = div_date%7
  else:
    mod_date = (div_date+11)%7
  return 7 - mod_date
	#This portion of code checks wether the birthday is in the 1900's or the
	#2000's so the base doomsday can be adjusted.  the week is based on the 
	#Sunday through Saturday week with Sunday as zero "0" and Saturday as six "6"
def Anchor_finder(date):
	yyxx = int(date[6:8])
	if yyxx == 19:
		anchor = 3
	if yyxx == 20:
		anchor = 4
	return anchor
	#this code is used to output the numerical day of the week to be used to 
	#adjust from the Anchor date to the birthdate input.  This code can be uncommented to 
	#output the human readable day of the week.
def Doomsday(date):
	weekday = (Anchor_finder(date) + Year_step_2(date))%7 
	day_of_week = ['Sunday', 'Monday','Tuesday','Wednesday','Thursday','Friday','Saturday']
	return weekday
	# if weekday == 0:
		# return day_of_week[0]
	# if weekday == 1:
		# return day_of_week[1]
	# if weekday == 2:
		# return day_of_week[2]
	# if weekday == 3:
		# return day_of_week[3]
	# if weekday == 4:
		# return day_of_week[4]
	# if weekday == 5:
		# return day_of_week[5]
	# if weekday == 6:
		# return day_of_week[6]
		
		
	#This code determines if the year in question is a leap year or not. 
	#Leap years require that the anchor date in a given month need to be changed.
def Leap_year(date):
	year = int(date[6:])
	leap_year = 0
	if year%400 == 0:
		leap_year = 1
	elif year%100 == 0:
		leap_year = 0
	elif year%4 == 0:
		leap_year = 1
	else:
		leap_year = 0
	return leap_year
 
	#This code uses the input from the above calculations to determine
	#what day of the week the birthday is on.
def User_Day(date):
	leap_year = Leap_year(date)
	doomsday = Doomsday(date)
	anchor = (Anchor_finder(date) + Year_step_2(date))%7
	mm = int(date[0:2])
	dd = int(date[3:5])
	if leap_year == 1:
		month = [0,4,22,14,4,9,6,4,8,5,10,7,12]
	elif leap_year == 0:
		month = [0,3,14,14,4,9,6,4,8,5,10,7,12]
	if month[mm] < dd:
		ndd = dd - month[mm]
		ndd = abs(ndd)
		diff = ndd%7
		week_day = doomsday + diff
		week_day = abs(week_day)%7
	else:
		ndd = month[mm] - dd
		ndd = abs(ndd)
		diff = ndd%7
		week_day = doomsday + 7 - diff
		week_day = abs(week_day)%7
	return int(week_day)#, anchor, diff, ndd, dd
	
def Day_of_week(date):
	weekday = User_Day(date)
	day_of_week = ['Sunday', 'Monday','Tuesday','Wednesday','Thursday','Friday','Saturday']
	if weekday == 0:
		return day_of_week[0]
	if weekday == 1:
		return day_of_week[1]
	if weekday == 2:
		return day_of_week[2]
	if weekday == 3:
		return day_of_week[3]
	if weekday == 4:
		return day_of_week[4]
	if weekday == 5:
		return day_of_week[5]
	if weekday == 6:
		return day_of_week[6]
	else:
		return 'ERROR'
 
def main():
	if len(sys.argv[1]) != 10:
		print 'Your year must be in a 4 digit form mm-dd-yyy'
		sys.exit(1)
	else:
		date = sys.argv[1]
		# print Birth_day(date)
		# print Year_step_2(date)
		# print Anchor_finder(date)
		# print 'Doomsday is',Doomsday(date)
		print 'You were born on a', Day_of_week(date)
		# print User_Day(date),'User_Day'
if __name__ == '__main__':
    main()
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