Android app (and widget collection) that displays sunlight and moonlight times.

Time zone database and code

A Date Picker widget for Java FX

Short-term repository for IANA tz validation code

An immutable subclass of DateTime

An SNTP-based clock for Noda Time

Rust date and time library

Advanced date, time and interval library for Java with sun/moon-astronomy and calendars like Chinese, Coptic, Ethiopian, French Republican, Hebrew, Hijri, Historic Christian, Indian National, Japan…