Elegant way to convert OffsetDateTime to PrimitiveDateTime

[liushuyu]

Is there an elegant way to convert OffsetDateTime to PrimitiveDateTime (given the timezone is already taken care of)?

Situation: an API from an external library accepts a PrimitiveDateTime but I currently own an OffsetDateTime.

Current hacky solution:

let input_time = datetime!(2000-01-01 0:00 +0);
let converted = PrimitiveDateTime(input_time.date(), input_time.time());
some_external_api(converted);

I am asking this question because there exists an elegant way to convert PrimitiveDateTime to OffsetDateTime (using .assume_local or .assume_utc).

[jhpratt]

That is currently the best solution. I have been extremely hesitant to add an API for this, as I feel it will be very error prone. I just had an idea that may work — fn to_primitive_with_offset(self) -> (PrimitiveDateTime, UtcOffset) as a method on OffsetDateTime. But I also just woke up, so we'll see how I feel about it later.

[jhpratt]

Coming back around to this. I have decided to not implement this method. This is because it is possible for the stored PrimitiveDateTime to be outside the range of valid values (for external code), and returning it would violate the range validity. Effectively, it would be possible to obtain a PrimitiveDateTime that is larger than PrimitiveDateTime::MAX (and smaller than min).

While this could change depending on the internal representation, the fact that it's a possibility implicitly exposes some knowledge of the representation, which is not desirable.