Python：我怎样才能看出今年某个月和今天是否已经过去了？

Question

Today it's 16 Feb . I have a string 23 Mar . How can I check if my string is before or after the current day?

I have a list of files with the last modified date attached. They only have a day and month, no year. If the date has already passed this year (eg 16/01), the year should be 2014, if not (eg 30/12), the year should be 2013.

Answer 1

Parse out the string into a datetime object using datetime.datetime.strptime() , but since your date string has no year attached to it, do attach the current year to it:

import datetime

today = datetime.date.today()
yourdate = datetime.datetime.strptime(inputstring, '%d %b')
yourdate = yourdate.date().replace(year=today.year)

if yourdate >= today:
    # date not before today, attach *last* year
    yourdate = yourdate.replace(year=today.year - 1)

I converted the datetime object to a date object here too since we only need to talk about dates.

This does assume your date strings always are of the form day-of-the-month month-abbreviated in English.

Demo:

>>> import datetime
>>> inputstring = '23 Mar'
>>> today = datetime.date.today()
>>> yourdate = datetime.datetime.strptime(inputstring, '%d %b')
>>> yourdate = yourdate.date().replace(year=today.year)
>>> yourdate
datetime.date(2014, 3, 23)
>>> yourdate >= today
True