Make Datetime sortable?

[alexwennerberg]

I'm trying to sort a list of emails by datetime, and it appears the DateTime struct doesn't allow this -- what do you think the best solution is for this?

[mdecimus]

The quickest solution would be converting the date to a ISO8601 string using Message::get_date().unwrap().to_iso8601(). Alternatively you could use the chrono crate to convert the date to a timestamp, or sort directly the chrono object.

[alexwennerberg]

Would you accept a PR that converted this datetime object to unix time? I'm trying to avoid pulling in chrono as a dependency @mdecimus

[mdecimus]

Ok, I'll add this feature as soon as I have some free time this week. I found a neat algorithm for this:
https://github.com/protocolbuffers/upb/blob/22182e6e/upb/json_decode.c#L982

[alexwennerberg]

@mdecimus I actually found the same thing and implemented it here lol https://git.alexwennerberg.com/crabmail/file/src/utils.rs.html#l6

Haven't really tested it yet though, just tried to copy/paste the c code. It's also not that idiomatic

[mdecimus]

Done, v.0.4.5 is out with support for timestamp conversion and sorting by DateTime.