Almanac 历

A C implementation of most of the book "Calendrical Calculations".

Early Modern Dates

An Orthodox and Catholic Easter Date Calculator

Convert between Julian day numbers and Julian & Gregorian calendars

A Swift framework containing an astronomical model of the Moon, including properties to obtain the age, percent illuminated, phase, transitions, and other properties of the Moon at a point in time. This is a Swift port of John Walker's `moontool.c`, originally written in 1987.

Application that provides support for Old and New Orthodox Calendar for the years 1924 to 2099

Julian date calculations and calendar conversions for Swift.

Multilingual structured Old and New Orthodox Calendar dataset 1924 - 2099

jcalendaR is a package for converting between current Japanese calendar, old Japanese calendar that Kyureki, and Julian and (proleptic) Gregorian calendar in R.

Converts a gregorian date to julian date.

Historic calendars of Europe

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.

Calendar implementation using object-oriented principles in C++.

An implementation of the Roman calendar post-Julian reforms (46 BC)

Julian Date gadget for Windows. main branch: https://barionleg.github.io/JulianDate/source/Julian.html

Selected development examples from Numerical Recipes in FORTRAN 77

An old code, written for embedded devices, thinked for calculate the sunset and sunrise time. It also have so many interesting calendar functions.