PrimitiveDateTime to Unix Timestamp

[GenericNerd]

Hey, firstly, thank you for making an awesome crate. This has been extremely helpful in combination with sqlx for what I'm working on, though I do currently find myself at a roadblock.

I am trying to use Discord timestamps which require a Unix timestamp to correctly create. While performing an operation to go from OffsetDateTime to PrimitiveDateTime (which allows a call to to_unix_timestamp()) is relatively simple, I have not found a good way so far to go from OffsetDateTime back to PrimitiveDateTime.

I am aware that PrimitiveDateTime does not provide a timezone, which OffsetDateTime assumes. I saw that this was a feature since at least 0.2.6, but I cannot find a way to do this now, and was hoping the best person to ask was the developer of the crate themselves.

I apologise if this seems dumb, I've been trying my best to come up with a solution by myself for the last couple of weeks and I'm coming short on answers! If you need any information from me, please let me know and I'll do my best to provide whatever you require as soon as I can!

[jhpratt]

Previously: #369, #390, #395, #454, #458, #553

The documentation for 0.2 is not relevant, as the current series is 0.3. However, the deprecation message on your link clearly states why it doesn't exist any more. As PrimitiveDateTime does not have any knowledge of an offset, it is impossible to calculate a Unix timestamp. You must tell time what the offset is. You do this with .assume_offset, which produces an OffsetDateTime.