Change `Duration::from_secs_*` underflow error
Change `Duration::from_secs_*` underflow error

Now explicitly says negative value.

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust