This is a simple Go package that deals with leap years.

The Is function determines whether a given year contains a leap day or not.

There are also Next and Prev functions: the former attempts to find the next leap year after a given year, and the latter attempts to find the previous leap year before a given year.

In the Gregorian calendar, a leap year is a year that has 366 days, whereas other years have only 365. The extra day is known as a leap day.

Approximately one out of every four years is a leap year. Every other year is known as a common year.

For more information, please read this blog post.

package main

import (
	"time"
	"fmt"

	leapYear "github.com/theTardigrade/golang-leapYear"
)

func main() {
	fmt.Println(leapYear.Is(1960)) // true
	fmt.Println(leapYear.Is(1961)) // false
	fmt.Println(leapYear.Is(2000)) // true
	fmt.Println(leapYear.Is(1800)) // false
	fmt.Println(leapYear.Is(1804)) // true

	fmt.Println(leapYear.Next(2020)) // 2024, true
	fmt.Println(leapYear.Next(1977)) // 1980, true

	fmt.Println(leapYear.Prev(2020)) // 2016, true
	fmt.Println(leapYear.Prev(1977)) // 1976, true
}

If you use this package, or find any value in it, please consider donating: