How Compute # of Days between Two Dates?

[W. eWatson]

That's the question in Subject. For example, the difference between
08/29/2008 and 09/03/2008 is +5. The difference between 02/28/2008 and
03/03/2008 is 4, leap year--extra day in Feb. I'm really only interested in
years between, say, 1990 and 2050. In other words not some really strange
period of time well outside our current era of history.

--
W. eWatson

(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

Web Page: <www.speckledwithstars.net/>

 

[Michael Tobis]

from datetime import datetime

# batteries included

today = datetime.now()
xmas = datetime(today.year,12,25)
if (xmas - today).days > 1:
print "%d days until Christmas" % (xmas - today).days
else:
print "Merry Christmas!"

 

[W. eWatson]

Does the standard library's datetime module not do what you want?

http://docs.python.org/lib/module-datetime.html

Yes, it would seem so. This works fine.

date1 = datetime.date(2007, 2, 27)
date2 = datetime.date(2007, 3, 3)

print "date1: ", date1
print "date2: ", date2
diff = date2 - date1
print "diff: ", diff
result:
date1: 2007-02-27
date2: 2007-03-03
diff: 4 days, 0:00:00

I was pondering this in pyfdate, but perhaps missed it or it was not obvious
to me in the tutorial for some reason. There are few places where it's not
quite complete. pyfdate has some rules for dealing with length of month
oddities that started me thinking it would have difficulty with situations
like the above. However, it would seem any general implementation of time
and date should be capable of making similar calculations without difficulty.

--
W. eWatson

(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

Web Page: <www.speckledwithstars.net/>

 

[W. eWatson]

It would probably be worth your while to read through one of
introductory Python books or just browse through the Python
tutorial:

http://docs.python.org/tut/

Oddly, Leaning Python has no mention of datetime (not date or time), at
least, that I could find. I'm considering the Nutshell book, 2nd ed., as a
better reference (and cross reference) to various topics.

Sorry, can't help you there -- I've never heard of pyfdate. The
timedate module that comes with Python has always done what I
needed to do with dates/times.

--
W. eWatson

(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

Web Page: <www.speckledwithstars.net/>

 

[Ari Makela]

Oddly, Leaning Python has no mention of datetime (not date or time), at
least, that I could find. I'm considering the Nutshell book, 2nd ed., as a
better reference (and cross reference) to various topics.

datetime is pretty new standard library module. I'm quite sure that
it wasn't around when the latest edition of Learning Python was written.