Binary assignment and other features in newer version of the time crate

[TianyiShi2001]

The the lateset release of chrono (v0.4.15) does not support binary assignment operators such as AddAssign and SubAssign as well as other features due to its dependence on an old version of the time crate:

For example, this won't work:

let mut instant = Local::now();
let mut duration = Duration::seconds(1);
instant += duration;
duration += duration;

Does chrono plan to migrate to a newer version of time?

[benesch]

Not the maintainer, but I believe the plan is to move off the time crate entirely. See #400.

[quodlibetor]

benesch is correct, the plan is to move off the time crate. AddAssign/SubAssign will be implemented for the chrono-local versions of those structs, though.