chinese calendar，通过天文计算和民间推算方法，准确计算出公历-1000年至3000年的农历、干支、节气等，同时支持多配置、多语言、多时区。日历、中国农历、阴历、节气、干支、生肖、星座、日曆、中國農曆、陰曆、節氣

chinese calendar，通过天文计算和民间推算方法，准确计算出公历-1000年至3000年的农历、干支、节气等，同时支持多配置、多语言、多时区。日历、中国农历、阴历、节气、干支、生肖、星座、日曆、中國農曆、陰曆、節氣

C ++ library for working with date and time

A library for handling dates and times across arbitrary calendar systems

Omnical: print calendars, convert dates, and more

Precise Julian Day Java library

Простая C++ библиотека для работы с временем и датой

Convert between Julian day numbers and Julian & Gregorian calendars

Master the seasons with the Milesian calendar. Conversion and display JS routines.

Astrometric Java code

Various online calculation tools for calendars and dates

The project is a collection of functions to convert dates between Gregorian and Julian calendars. Additionally it includes functions to calculate Orthodox and Catholic Easter dates.

DoD Ordinal Date ("Julian Date") converter

Date from and to Julian Day and Day of the week for HP 35s Calculator

Packages in Ada defining the Milesian calendar, conversion from/to Julian day, from/to julian-gregorian, and giving the phase of the mean moon.