Better WP Time Constants

class-dj-exact-year-month-time-constants.php

<?php
/**
 * Constants for the exact number of seconds in any given year and in any given
 * month on the Gregorian calendar. Meant to be used in place of the current
 * 'YEAR_IN_SECONDS' and 'MONTH_IN_SECONDS' integrations found in
 * {@link https://codex.wordpress.org/Easier_Expression_of_Time_Constants|WordPress}.
 *
 * @author Davey Jacobson <djacobson@usarugby.org>
 * @package DJ_Exact_Year_Month_Time_Constants
 */

if ( ! defined( 'ABSPATH' ) ) exit;

class DJ_Exact_Year_Month_Time_Constants {

    function __construct() {
        add_action( 'init', array( $this, 'constants' ), 1 );
    }

    /**
     * Custom Date/Time Constants
     *
     * @since 1.0.0
     */
    private function constants() {
        if ( ! defined( 'YEAR_IN_SECS' ) ) {
            define( 'YEAR_IN_SECS', $this->year_in_seconds() );
        }

        if ( ! defined( 'MONTH_IN_SECS' ) ) {
            define( 'MONTH_IN_SECS', $this->month_in_seconds() );
        }
    }

    /**
     * Calculate number of seconds for each month.
     *
     * @return int      This month in seconds.
     */
    public function month_in_seconds() {

        static $month_in_seconds = null;

        $key = date( 'M' );

        $days_per_month = array(
            'Jan' => 31,
            'Feb' => ( $this->is_leap_year() ? 29 : 28 ),
            'Mar' => 31,
            'Apr' => 30,
            'May' => 31,
            'Jun' => 30,
            'Jul' => 31,
            'Aug' => 31,
            'Sep' => 30,
            'Oct' => 31,
            'Nov' => 30,
            'Dev' => 31,
        );

        if ( isset( $days_per_month[ $key ] ) ) {
            $month_in_seconds = ( $days_per_month[ $key ] * DAY_IN_SECONDS );
        }

        return $month_in_seconds;
    }

    /**
     * Account for WP default constants lack of depth.
     *
     * @return int      This year in seconds.
     */
    public function year_in_seconds() {

        static $year_in_seconds = null;

        if ( $this->is_leap_year() ) {

            $year_in_seconds = ( YEAR_IN_SECONDS + DAY_IN_SECONDS );
        }
        else {

            $year_in_seconds = YEAR_IN_SECONDS;
        }

        return $year_in_seconds;
    }

    /**
     * Check if it's currently a 'leap year'.
     *
     * @return bool
     */
    public function is_leap_year() {

        // Ensure that '0' isn't read as boolean.
        $zero = (int) 0;

        // Current Year
        $year = date( 'Y' );

        // No remainders means it's a leap year!
        return ( $year % 4 === $zero ) ? true : false;
    }

}

new DJ_Exact_Year_Month_Time_Constants();