d3-time-format
A JavaScript time formatter and parser inspired by strftime and strptime.
Updated by @mbostock
pretty-ms
Convert milliseconds to a human readable string: `1337000000` → `15d 11h 23m 20s`
Updated by @sindresorhus
humanize-duration
Convert millisecond durations to English and many other languages.
Updated by @evanhahn
@date-io/date-fns
Abstraction over common javascript date management libraries
Updated by @dmtr.kovalenko