I have a program where the user enters a date and then compares it to another date to see which one comes first.
How would I go about writing a code where the user inputs Feb 29 and the program returns Feb 28 instead (since there is no leap year)?
Example:
def date(prompt):
''' returns the date that user inputs and validates it'''
while True:
try:
date = raw_input(prompt)
if len(date) >= 5:
month = date[0:2]
day = date[3:5]
dateObject = datetime.date(2011, int(month), int(day))
return dateObject
except ValueError:
print "Please enter a valid month and day"
How do you compare dates? If you use the datetime
functions then this should already account for this sort of stuff.
>>> datetime.datetime(2011, 2, 28)
datetime.datetime(2011, 2, 28, 0, 0)
>>> datetime.datetime(2011, 2, 29)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: day is out of range for month
>>> datetime.datetime(1600, 2, 29)
datetime.datetime(1600, 2, 29, 0, 0)
datetime.timedelta()
is used to represent the difference between two dates
>>> datetime.datetime(2011, 2, 28) + datetime.timedelta(days=10)
datetime.datetime(2011, 3, 10, 0, 0)
>>> datetime.datetime(1600, 2, 28) + datetime.timedelta(days=10)
datetime.datetime(1600, 3, 9, 0, 0)
>>> datetime.datetime(2011, 2, 28) - datetime.datetime(2011, 4, 10)
datetime.timedelta(-41)
Don't know how this fits in your code, but it may be an option ;-)
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