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DateTime
(xkcd.com)
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.net has a timespan data type specifically for this sort of thing.
After using it, coming to python and not having a super easy way to work with dates is a pain.
But DateTime in dotNet have horrible timezone support. It's essentially either local timezone, not timezone or utc. And the utc part is somewhat rough. There's some datetimeoffset and the like, but they too just don't let working with timezones be easy.
I'm guessing it's not alone. Every time format should come with a distance function and order function, or equivalent. If you have a life, that could mean something like subtraction.
Unfortunately, "should" isn't always enough. Optimally there's also type structure to the return of the function so you can't mix up seconds and days, or calendar and (one of the) standard length days.