# how to get the same day of next month of a given day in python using datetime

i know using datetime.timedelta i can get the date of some days away form given date

daysafter = datetime.date.today() + datetime.timedelta(days=5)

but seems no datetime.timedelta(months=1)

!Thanks for any help!

Of course there isn't -- if today's January 31, what would be "the same day of the next month"?! Obviously there is no right solution, since February 31 does not exist, and the datetime module does not play at "guess what the user posing this impossible problem without a right solution thinks (wrongly) is the obvious solution";-).

I suggest:

try:
nextmonthdate = x.replace(month=x.month+1)
except ValueError:
if x.month == 12:
nextmonthdate = x.replace(year=x.year+1, month=1)
else:
# next month is too short to have "same date"
# pick your own heuristic, or re-raise the exception:
raise

Use dateutil module. It has relative time deltas:

import datetime
from dateutil import relativedelta
nextmonth = datetime.date.today() + relativedelta.relativedelta(months=1)

Beautiful.

import calendar, datetime

def next_month ( date ):
"""return a date one month in advance of 'date'.
If the next month has fewer days then the current date's month, this will return an
early date in the following month."""
return date + datetime.timedelta(days=calendar.monthrange(date.year,date.month)[1])
from calendar import mdays
from datetime import datetime, timedelta

today = datetime.now()
next_month_of_today = today + timedelta(mdays[today.month])

I don't want to import dateutil. Have a try this. Good luck.

from datetime import timedelta
try:
next_month = (x.replace(day=28) + timedelta(days=7)).replace(day=x.day)
except ValueError:  # assuming January 31 should return last day of February.
next_month = (x + timedelta(days=31)).replace(day=1) - timedelta(days=1)

This is how I solved it.

from datetime import date
try:
(year, month) = divmod(date.today().month, 12)
next_month = date.today().replace(year=date.today().year+year, month=month+1)
except ValueError:
# This day does not exist in next month

You can skip the try/catch if you only want the first day in next month by setting replace(year=date.today().year+year, month=month, day=1). This will always be a valid date since we have caught the month overflow using divmod.

This work for me

import datetime
import calendar

def next_month_date(d):
_year = d.year+(d.month//12)
_month =  1 if (d.month//12) else d.month + 1
next_month_len = calendar.monthrange(_year,_month)[1]
next_month = d
if d.day > next_month_len:
next_month = next_month.replace(day=next_month_len)
next_month = next_month.replace(year=_year, month=_month)
return next_month

usage:

d = datetime.datetime.today()
print next_month_date(d)