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Python语言: Python中按月增加datetime
1653#coding=utf-8
#from:
import datetime
# input datetime1, and an month offset
# return the result datetime
def datetime_offset_by_month(datetime1, n = 1):
# create a shortcut object for one day
one_day = datetime.timedelta(days = 1)
# first use div and mod to determine year cycle
q,r = divmod(datetime1.month + n, 12)
# create a datetime2
# to be the last day of the target month
datetime2 = datetime.datetime(
datetime1.year + q, r + 1, 1) - one_day
# if input date is the last day of this month
# then the output date should also be the last
# day of the target month, although the day
# may be different.
# for example:
# datetime1 = 8.31
# datetime2 = 9.30
if datetime1.month != (datetime1 + one_day).month:
return datetime2
# if datetime1 day is bigger than last day of
# target month, then, use datetime2
# for example:
# datetime1 = 10.31
# datetime2 = 11.30
if datetime1.day >= datetime2.day:
return datetime2
# then, here, we just replace datetime2's day
# with the same of datetime1, that's ok.
return datetime2.replace(day = datetime1.day)
#------------------------------------------
# test
d1 = datetime.datetime(2008, 8, 17)
d2 = datetime_offset_by_month(d1, 13)
print '2008-8-17 + 13 month'
print d2
d1 = datetime.datetime(2008, 8, 31)
d2 = datetime_offset_by_month(d1, 13)
print '2008-8-31 + 13 month'
print d2
d1 = datetime.datetime(2007, 1, 30)
d2 = datetime_offset_by_month(d1, 13)
print '2007-1-30 + 13 month'
print d2
result = """
2008-8-17 + 13 month
2009-09-17 00:00:00
2008-8-31 + 13 month
2009-09-30 00:00:00
2007-1-30 + 13 month
2008-02-29 00:00:00
"""
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