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This PR migrates uv's use of `chrono` to `jiff`. I did most of this work a while back as one of my tests to ensure Jiff could actually be used in a real world project. I decided to revive this because I noticed that `reqwest-retry` dropped its Chrono dependency, which is I believe the only other thing requiring Chrono in uv. (Although, we use a fork of `reqwest-middleware` at present, and that hasn't been updated to latest upstream yet. I wasn't quite sure of the process we have for that.) In course of doing this, I actually made two changes to uv: First is that the lock file now writes an RFC 3339 timestamp for `exclude-newer`. Previously, we were using Chrono's `Display` implementation for this which is a non-standard but "human readable" format. I think the right thing to do here is an RFC 3339 timestamp. Second is that, in addition to an RFC 3339 timestamp, `--exclude-newer` used to accept a "UTC date." But this PR changes it to a "local date." That is, a date in the user's system configured time zone. I think this makes more sense than a UTC date, but one alternative is to drop support for a date and just rely on an RFC 3339 timestamp. The main motivation here is that automatically assuming UTC is often somewhat confusing, since just writing an unqualified date like `2024-08-19` is often assumed to be interpreted relative to the writer's "local" time. |
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