maths.zellers_congruence

Attributes

parser

Functions

zeller(→ str)

Module Contents

maths.zellers_congruence.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 separator:

>>> zeller('01-31*2010')
Traceback (most recent call last):
    ...
ValueError: Date separator must be '-' or '/'

Validate first separator:

>>> zeller('01^31-2010')
Traceback (most recent call last):
    ...
ValueError: Date separator 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 of 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

maths.zellers_congruence.parser