serde_with SerializeAs & DeserializeAs support for time crate

[felschr]

Versions/Environment

1. What version of Rust are you using? rustc 1.71.1 (eb26296b5 2023-08-03)
2. What operating system are you using? NixOS 23.05 (Linux)
3. What versions of the driver and its dependencies are you using? mongodb@2.6.0 & bson@2.6.1

Describe the bug

serde_with's DeserializeAs & SerializeAs are currently only implemented for chrono. It would be nice to see them supported for time's OffsetDateTime & PrimitiveDateTime as well.

To Reproduce

use serde::{Deserialize, Serialize};
use serde_with::serde_as;

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Banana {
    #[serde_as(as = "Option<bson::DateTime>")]
    pub expires: Option<time::OffsetDateTime>,
}

Additional Notes
Because proper support for serde_with is missing, I'm currently using:

#[serde(with = "bson::serde_helpers::time_0_3_offsetdatetime_as_bson_datetime")]

But this doesn't work when my OffsetDateTime is wrapped in an Option like in the example above.
Is there another way to achieve this right now before full with_serde support is implemented?

[felschr]

Oh, I just saw that support has recently been implemented on main for time::OffsetDateTime: 09a8cbb

Guess we'll just have to wait for a new release then.

Not sure if it makes sense to implement it for PrimitiveDateTime as well (I haven't used it yet myself), but if it does that would also be nice to have.

[isabelatkinson]

Hi @felschr, we will likely be doing a bson release this week, so this functionality will be available then. Feel free to file a ticket in our Jira project if you would be interested in PrimitiveDateTime support!