Leap year formula

$day = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
$year = 2021;

if (($year % 4 == 0 && $year % 100 != 0) || ($year % 400 == 0)) {
  $day = [ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];
  echo "This is leap year - get 366 day";
  
} else {
   echo "This is NOT leap year - get ONLY 365 day";
}

Calculate if year is leap year

if (i%4==0 && i%100!=0 || i%400==0) {
months[2] = 29;
}
else {
month[2] = 28;
}

Leap year

import calendar

def is_leap(year):
    return calendar.isleap(year)

-1

Source: hackerrank.com

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