Almanac 历

• UpdatedSep 27, 2024
• JavaScript

OrthCalKAOV is an application that provides support for both the Old Calendar (Julian Calendar) and the New Calendar (Revised Julian Calendar) for the years 1925 to 2099.

• UpdatedSep 17, 2024
• TypeScript

Early Modern Dates

• UpdatedApr 25, 2022
• Java

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

• UpdatedJul 2, 2022
• C

An Orthodox and Catholic Easter Date Calculator

• UpdatedOct 22, 2017
• JavaScript

Multilingual Orthodox Liturgical Calendar Dataset (Old and New Calendar 1924 - 2099)

• UpdatedMar 25, 2025
• Python

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.

• UpdatedJun 1, 2023
• Swift

Convert between Julian day numbers and Julian & Gregorian calendars

• UpdatedMar 3, 2025
• Rust

Julian date calculations and calendar conversions for Swift

• UpdatedMar 26, 2025
• Swift

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

• UpdatedJun 25, 2024
• R

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.

• UpdatedJan 1, 2024
• JavaScript

Converts a gregorian date to julian date.

• UpdatedApr 8, 2021
• AutoIt

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

• UpdatedDec 2, 2015
• C++

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

• UpdatedDec 1, 2021
• C#

Selected development examples from Numerical Recipes in FORTRAN 77

• UpdatedMar 25, 2025
• Fortran