Convert timedelta to total seconds

Use timedelta.total_seconds().

>>> import datetime>>> datetime.timedelta(seconds=24*60*60).total_seconds()86400.0

You have a problem one way or the other with your datetime.datetime.fromtimestamp(time.mktime(time.gmtime())) expression.

(1) If all you need is the difference between two instants in seconds, the very simple time.time() does the job.

(2) If you are using those timestamps for other purposes, you need to consider what you are doing, because the result has a big smell all over it:

gmtime() returns a time tuple in UTC but mktime() expects a time tuple in local time.

I'm in Melbourne, Australia where the standard TZ is UTC+10, but daylight saving is still in force until tomorrow morning so it's UTC+11. When I executed the following, it was 2011-04-02T20:31 local time here ... UTC was 2011-04-02T09:31

>>> import time, datetime>>> t1 = time.gmtime()>>> t2 = time.mktime(t1)>>> t3 = datetime.datetime.fromtimestamp(t2)>>> print t01301735358.78>>> print t1time.struct_time(tm_year=2011, tm_mon=4, tm_mday=2, tm_hour=9, tm_min=31, tm_sec=3, tm_wday=5, tm_yday=92, tm_isdst=0) ### this is UTC>>> print t21301700663.0>>> print t32011-04-02 10:31:03 ### this is UTC+1>>> tt = time.time(); print tt1301736663.88>>> print datetime.datetime.now()2011-04-02 20:31:03.882000 ### UTC+11, my local time>>> print datetime.datetime(1970,1,1) + datetime.timedelta(seconds=tt)2011-04-02 09:31:03.880000 ### UTC>>> print time.localtime()time.struct_time(tm_year=2011, tm_mon=4, tm_mday=2, tm_hour=20, tm_min=31, tm_sec=3, tm_wday=5, tm_yday=92, tm_isdst=1) ### UTC+11, my local time

You'll notice that t3, the result of your expression is UTC+1, which appears to be UTC + (my local DST difference) ... not very meaningful. You should consider using datetime.datetime.utcnow() which won't jump by an hour when DST goes on/off and may give you more precision than time.time()

More compact way to get the difference between two datetime objects and then convert the difference into seconds is shown below (Python 3x):

from datetime import datetime        time1 = datetime.strftime('18 01 2021', '%d %m %Y')    time2 = datetime.strftime('19 01 2021', '%d %m %Y')difference = time2 - time1difference_in_seconds = difference.total_seconds()