Python: get last Monday of July 2010

问题

How do I get the last Monday (or other day) of a given month?

回答1:

Using the calendar module from the stdlib:

import calendar
cal = calendar.Calendar(0)
month = cal.monthdatescalendar(2010, 7)
lastweek = month[-1]
monday = lastweek[0]
print(monday)

2010-07-26

回答2:

Have a look at dateutil:

from datetime import datetime
from dateutil import relativedelta
datetime(2010,7,1) + relativedelta.relativedelta(day=31, weekday=relativedelta.MO(-1))

returns

datetime.datetime(2010, 7, 26, 0, 0)

回答3:

Based on Gary's answer :

import calendar
month = calendar.monthcalendar(2010, 7)
mondays = [week[0] for week in month if week[0]>0]
print mondays[-1]

26

This works for getting the last Sunday of the month even if the last week of the month has no Sunday.

回答4:

A tiny improvement on manu's answer !

import calendar
month = calendar.monthcalendar(2010, 7)
day_of_month = max(month[-1][calendar.SUNDAY], month[-2][calendar.SUNDAY])
print day_of_month 

来源：https://stackoverflow.com/questions/12796389/python-get-last-monday-of-july-2010