jdn

README

jdn

Julian Day Numbers for Go

Installation

To install run:

go get github.com/leemcloughlin/jdn

Documentation

For documentation including examples please see:

https://pkg.go.dev/github.com/leemcloughlin/jdn

Documentation

Overview

Convert to and from Julian Day Numbers

Note uses only integer arithmetic

Index

• func FromNumber(julianDay int) (year int, month time.Month, day int)
• func ToNumber(year int, month time.Month, day int) (julianDay int)

Examples

• FromNumber
• ToNumber

Functions

func FromNumber

func FromNumber(julianDay int) (year int, month time.Month, day int)

FromNumber converts a Julian Day Number to a year, month, day in the appropriate calendar (Julian or Gregorian).

Example

y, m, d := FromNumber(2456157) // Day I met my fiancé
fmt.Printf("%d %s %d\n", y, m, d)

Output:

2012 August 17

func ToNumber

func ToNumber(year int, month time.Month, day int) (julianDay int)

ToNumber converts a year, month, day into a Julian Day Number. Based on http://en.wikipedia.org/wiki/Julian_day#Calculation. Only valid for dates after the Julian Day epoch which is January 1, 4713 BCE.

Example

jd := ToNumber(2012, time.August, 17) // Day I met my fiancé
fmt.Println(jd)

Output:

2456157