time addition

Високосний рік
Високосний рік у треку Go 
// Package leap is a small library for determing if the passed in year is a leap year.
package leap

import "time"

// IsLeapYear returns if the passed in year is a leap year.
func IsLeapYear(year int) bool {
	return time.Date(year, time.February, 28, 0, 0, 0, 0, time.UTC).Add(time.Duration(time.Hour*24)).Day() == 29
}

This approach may be considered a "cheat" for this exercise. By adding a day to February 28th for the year, you can see if the new day is the 29th or the 1st. If it is the 29th, then the year is a leap year. This is done by using the time.Add() and time.Day() functions.

Translation missing: uk.number.nth.ordinalized Sep 2026 · Це було корисно?

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// Package leap is a small library for determing if the passed in year is a leap year.
package leap

// IsLeapYear returns if the passed in year is a leap year.
func IsLeapYear(year int) bool {
	return  year%4 == 0 && (year%100 != 0 || year%400 == 0)
}
Boolean chain

Use a chain of boolean expressions. 

func IsLeapYear(year int) bool {
	if year%100 == 0 {
		return year%400 == 0
	} else {
		return year%4 == 0
	}
}
Maximum two checks

Use a maximum of two checks. 

package leap

import "time"

// IsLeapYear returns if the passed in year is a leap year.
func IsLeapYear(year int) bool {
	return time.Date(year, time.December, 31, 0, 0, 0, 0, time.UTC).YearDay() == 366
}
time.YearDay()

Use time YearDay().