bttf is a command-line utility for working with dates and times. It exposes
much of the functionality of the Jiff datetime library on the command line,
providing a more intuitive way to format datetimes or do arithmetic than
traditional tools like date(1).

Features include datetime formatting with custom patterns, arithmetic with
durations, time zone conversions, duration calculations, sequence generation
for recurring dates, and a "tag" mode that finds and processes datetimes
embedded in arbitrary data.

bttf deliberately does not aim for POSIX date(1) compatibility, instead
offering a fresh, modern approach.