monthday

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This package provides the MonthDay value type for dealing dates without year. It is useful for dealing with birthdays, or anniversaries. Works on Python 2.6, 2.7, 3.2–3.5, PyPy, PyPy3.

>>> from monthday import *
>>> aug_4 = MonthDay(8, 4)
>>> aug_4
monthday.MonthDay(8, 4)
>>> aug_4.date(1988)
datetime.date(1988, 8, 4)
>>> list(aug_4.dates(range(2013, 2016)))
[datetime.date(2013, 8, 4),
 datetime.date(2014, 8, 4),
 datetime.date(2015, 8, 4)]
>>> from datetime import date
>>> MonthDay.from_date(date(2015, 12, 25))
monthday.MonthDay(12, 25)

It’s available on PyPI:

$ pip install monthday

Written by Hong Minhee, and distributed under LGPLv3 or later. Find the source code from the GitHub repository.

monthday — Date without year

class monthday.MonthDay(month, day)

Date without year. Useful for birthdays, or anniversaries.

Parameters:
Raises ValueError:
 

if month or date is out of valid range
month

(numbers.Integral) The month number, from 1 to 12.

day

(numbers.Integral) The day of the month, from 1 to 31.

date(year)

Get a date by combining the given year with it.

>>> MonthDay(12, 25).date(2015)
datetime.date(2015, 12, 25)

It may raise ValueError if February 29 is tried to be combined with a non-leap year e.g.:

>>> feb_29 = MonthDay(2, 29)
>>> feb_29.date(2012)
datetime.date(2012, 2, 29)
>>> feb_29.date(2013)
Traceback (most recent call last):
  ...
ValueError: since 2013 is not a leap year,
            monthday.MonthDay(2, 29) can't be combined with 2013
Parameters:year (numbers.Integral) – a year to combine with
Returns:a datetime.date with the given year
Return type:datetime.date
Raises ValueError:
 when year is not a leap year while it’s MonthDay(2, 29)
dates(years, error_invalid_dates=True)

Get dates by combining the given years with it.

>>> list(MonthDay(8, 4).dates(range(1988, 1992)))
[datetime.date(1988, 8, 4), datetime.date(1989, 8, 4),
 datetime.date(1990, 8, 4), datetime.date(1991, 8, 4)]

It may raise ValueError if there happen to be any invalid dates in the result, e.g. Feburary 29 for non-leap years:

>>> feb_29 = MonthDay(2, 29)
>>> list(feb_29.dates(range(2011, 2017)))
Traceback (most recent call last):
  ...
ValueError: since 2010 is not a leap year,
            monthday.MonthDay(2, 29) can't be combined with 2010

If you want to simply ignore these invalid dates in the result, set error_invalid_dates to False e.g.:

>>> list(feb_29.dates(range(2011, 2017), error_invalid_dates=False))
[datetime.date(2012, 2, 29), datetime.date(2016, 2, 29)]

But the result length might be shorter than the input years list.

If you want to match the length of the input and the result, set error_invalid_dates to None — it will replace invalid dates in the result with None values e.g.:

>>> list(feb_29.dates(range(2011, 2017), error_invalid_dates=None))
[None, datetime.date(2012, 2, 29),
 None, None, None, datetime.date(2016, 2, 29)]
Parameters:
  • years (Iterable) – years to combine with
  • error_invalid_dates (bool, type(None)) – if set to True, raise ValueError for invalid dates. if set to False, just ignore invalid dates — the result length might be shorter than the input years list. if set to None, fill None values instead of invalid dates — the result length must be the same to the input year list. True by default
Returns:

datetime.date values with the given years. the order corresponds to the input years‘ order
Return type:

Iterable
Raises:
  • ValueError – if error_invalid_dates is set to True and there happend to be any invalid dates in the result
  • TypeError – if years is not iterable of integers
classmethod from_date(date)

Get only MonthDay from the given date.

Parameters:date (datetime.date, datetime.datetime) – the date or date/time
Returns:MonthDay without date‘s year
Return type:MonthDay

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