relative-duration-1.0.1 has been yanked.
relative-duration
Durations that can be negative in rust, for people that want to substract durations without having to use bigger type.
Disclaimer
This crate is still a work in progress; but I will make it more documented in the next few months since it's not so big.
if you want to use it nonetheless, here is an example of how to use it, it's pretty handy to do calculations on durations:
use Duration;
use RelativeDuration;