is-leap-february.php

/**
 * Given a timestamp, return true if it is a leap year.
 *
 * @param int $timestamp A unix timestamp.
 *
 * @return bool
 */
function is_leap_year( int $timestamp ): bool {
	return (bool) date( 'L', $timestamp );
}

/**
 * Given a timestamp, return true if it is February in a leap year.
 *
 * @param int $timestamp
 *
 * @return bool
 */
function is_leap_february( int $timestamp ): bool {

	return is_leap_year( $timestamp ) && date( "m", $timestamp ) === '02';
}