add a timestamp() method to datetime.date class

[ZeeD]

Feature or enhancement

Extend the datetime.date class with a new method timestamp() that mimic the same behavior of datetime.datetime.timestamp, where the time is implicitly "00:00".

Pitch

At the moment both datetime.datetime and datetime.date offers the fromtimestamp() classmethod to convert from float.
datetime.datetime objects, moreover, offer the timestamp() method to convert to float.
A similar method lacks for datetime.date.

Apart from the (lack of) symmetry, there are also some use cases where it's necessary to switch back-and-forth between datetime.dates and floats and it would be handy to have some predefined function already.

Previous discussion

https://discuss.python.org/t/a-timestamp-method-for-date-objects/13340

Linked PRs

• gh-103072: Add a timestamp() method to datetime.date #131226

[pganssle]

I'm pretty strongly -1 on this, the semantics are way wonky for multiple reasons. Dates don't have time stamps because they don't have to times. date specifically doesn't have a time zone, and so there would be no way to specify what 00:00 you are referring to; many people will think it is UTC, but to be consistent with the only other method where date is not abstract, we would want it to represent that time in the local system zone.

Normally I would leave this open for further discussion, but it seems like there was a decently long discussion on discourse that was leaning largely negative anyway, and I'm finding that I forget about these things, they stay open, then they attract PRs from well meaning people, so I will close this until there is a compelling reason to reopen it.