time4j
There are 2 repositories under time4j topic.
MenoData/Time4J
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, Japanese, Julian, Korean, Minguo, Persian, Thai, Vietnamese
MenoData/Time4A
Advanced Date and Time Library for Android