Python timedelta with seconds

Question

On the doc it says for timedelta(seconds= ), the seconds should be Between 0 and 86399 inclusive. However I hope to pass a parameter with timedelta(seconds=432000) (5 days in seconds. I understand we can pass days = 5 but it was preferred for the parma to be written in seconds. It is larger than 86399 but in console when I tested, it was still resolved to days. Is it ok to pass in seconds like this ? Many thanks for your help.

nowtime = datetime.now() print(nowtime) 2021-06-24 15:08:36.048664 plusdays = timedelta (seconds = 432000) print(nowtime+plusdays) 2021-06-29 15:08:36.048664

If the documentation says the max is 86399, you're taking a chance if you use anything larger. It could stop working tomorrow. — Mark Ransom
– Mark Ransom, Commented Jun 24, 2021 at 3:16

Tim Peters · Accepted Answer · 2021-06-25 17:17:03Z

The docs don't say that ;-) They say that only days, seconds, and microseconds are stored internally, and are normalized in such a way that the internal seconds stored is in range(86400).

So far as what you can pass to the constructor, just about anything is fine; e.g., even negative seconds:

>>> from datetime import timedelta >>> timedelta(hours=1, seconds=-1) datetime.timedelta(seconds=3599)

Example

time.time() generally returns the number of seconds since 1970 began (the "Unix epoch"). That can be used directly to convert to and from a UTC datetime.

>>> import time >>> from datetime import datetime, timedelta >>> now = time.time(); datetime.utcnow() datetime.datetime(2021, 6, 24, 21, 51, 27, 939029) >>> now 1624571487.9390297 >>> datetime(1970, 1, 1) + timedelta(seconds=now) datetime.datetime(2021, 6, 24, 21, 51, 27, 939030)

The final output is within a microsecond of when utcnow() was called.

Thanks but could you elaborate a bit? I was referring to this page and it says If the normalized value of days lies outside the indicated range, OverflowError is raised. docs.python.org/3/library/datetime.html#timedelta-objects
Which says nothing about seconds, right? It says days. All inputs are converted to a mix of (only) microseconds, seconds and days; microsecond and seconds are normalized to force them into the documented ranges, which can cause "carries" into the next higher time unit (microseconds -> seconds, and seconds -> days), and then if the final number of days is outside the documented range for days, OverflowError is raised.

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