add jiff (or maybe more date-time crates like humantime?)

[poopsicles]

jiff is a (fairly new) date-time library by burntsushi, here's the r/rust post that went up when it was announced.

it deals with some of the shortcomings of the other popular date-time crates (there was a recent update with a friendly format as an alternative to humantime—though I still think humantime is fine for when you're not doing full-on date-time gymnastics), but is only 5ish months old and has only 1.5m downloads on crates.io (compared to time's 311m, chrono's 233m, humantime's 167m, hifitime's 290k, icu's 500k)

maybe there should be a "See also" section like the General Purpose Async Executors section where these other crates can be listed?

[djc]

Better to compare recent downloads (90 days):

• time: 27M
• chrono: 27M
• jiff: 1.3M

Given the author, I think it's probably okay to add this as an alternative similar to what we're doing for executors.