Zeller's Congruence Algorithm

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)

maths/zellers_congruence.py

@@ -0,0 +1,157 @@
+from __future__ import annotations
+import datetime
+import argparse
+
+
+def zeller(date_input: str) -> str:
+
+ """
+ Zellers Congruence Algorithm
+ Find the day of the week for nearly any Gregorian or Julian calendar date 
+
+ >>> zeller('01-31-2010')
+ 'Your date 01-31-2010, is a Sunday!'
+
+ Validate out of range month
+ >>> zeller('13-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Month must be between 1 - 12
+ >>> zeller('.2-31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.2'
+
+ Validate out of range date:
+ >>> zeller('01-33-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date must be between 1 - 31
+ >>> zeller('01-.4-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: invalid literal for int() with base 10: '.4'
+
+ Validate second seperator:
+ >>> zeller('01-31*2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate first seperator:
+ >>> zeller('01^31-2010')
+ Traceback (most recent call last):
+ ...
+ ValueError: Date seperator must be '-' or '/'
+
+ Validate out of range year:
+ >>> zeller('01-31-8999')
+ Traceback (most recent call last):
+ ...
+ ValueError: Year out of range. There has to be some sort of limit...right?
+
+ Test null input:
+ >>> zeller()
+ Traceback (most recent call last):
+ ...
+ TypeError: zeller() missing 1 required positional argument: 'date_input'
+
+ Test length fo date_input:
+ >>> zeller('')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+ >>> zeller('01-31-19082939')
+ Traceback (most recent call last):
+ ...
+ ValueError: Must be 10 characters long
+"""
+
+ # Days of the week for response
+ days = {
+ '0': 'Sunday',
+ '1': 'Monday',
+ '2': 'Tuesday',
+ '3': 'Wednesday',
+ '4': 'Thursday',
+ '5': 'Friday',
+ '6': 'Saturday'
+ }
+
+ convert_datetime_days = {
+ 0:1,
+ 1:2,
+ 2:3,
+ 3:4,
+ 4:5,
+ 5:6,
+ 6:0
+ }
+
+ # Validate
+ if not 0 < len(date_input) < 11:
+ raise ValueError("Must be 10 characters long")
+
+ # Get month
+ m: int = int(date_input[0] + date_input[1])
+ # Validate
+ if not 0 < m < 13:
+ raise ValueError("Month must be between 1 - 12")
+
+ sep_1:str = date_input[2]
+ # Validate
+ if sep_1 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get day
+ d: int = int(date_input[3] + date_input[4])
+ # Validate
+ if not 0 < d < 32:
+ raise ValueError("Date must be between 1 - 31")
+
+ # Get second seperator
+ sep_2: str = date_input[5]
+ # Validate
+ if sep_2 not in ["-","/"]:
+ raise ValueError("Date seperator must be '-' or '/'")
+
+ # Get year
+ y: int = int(date_input[6] + date_input[7] + date_input[8] + date_input[9])
+ # Arbitrary year range
+ if not 45 < y < 8500:
+ raise ValueError("Year out of range. There has to be some sort of limit...right?")
+
+ # Get datetime obj for validation
+ dt_ck = datetime.date(int(y), int(m), int(d))
+
+ # Start math
+ if m <= 2:
+ y = y - 1
+ m = m + 12
+ # maths var
+ c: int = int(str(y)[:2])
+ k: int = int(str(y)[2:])
+ t: int = int(2.6*m - 5.39)
+ u: int = int(c / 4)
+ v: int = int(k / 4)
+ x: int = int(d + k)
+ z: int = int(t + u + v + x)
+ w: int = int(z - (2 * c))
+ f: int = round(w%7)
+ # End math
+
+ # Validate math
+ if f != convert_datetime_days[dt_ck.weekday()]:
+ raise AssertionError("The date was evaluated incorrectly. Contact developer.")
+
+ # Response
+ response: str = f"Your date {date_input}, is a {days[str(f)]}!"
+ return response
+
+if __name__ == '__main__':
+ import doctest
+ doctest.testmod()
+ parser = argparse.ArgumentParser(description='Find out what day of the week nearly any date is or was. Enter date as a string in the mm-dd-yyyy or mm/dd/yyyy format')
+ parser.add_argument('date_input', type=str, help='Date as a string (mm-dd-yyyy or mm/dd/yyyy)')
+ args = parser.parse_args()
+ zeller(args.date_input)