date.php

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<?php
class Date
{

    private $date;
    private $day;
    private $year;
    private $month;
    private $timestamp;

    public function __construct($date = "")
    {
        if ($date) {
            $date_parts = explode("-", $date);
            $this->year = (int) $date_parts[0];
            $this->month = (int) $date_parts[1];
            $this->day = (int) $date_parts[2];
            $this->date = $date;
            $this->timestamp = mktime(0, 0, 0, $this->month, $this->day, $this->year);
        } else {
            $this->year = date("Y");
            $this->month = date("m");
            $this->day = date("d");
            $this->timestamp = time();
            $this->date = $this->year . "-" . sprintf("%02s", $this->month) . "-" . sprintf("%02s", $this->day);
        }
    }

    public function getMonthName()
    {
        return ucfirst(strftime("%B", $this->timestamp));
    }

    public function getAbrevMonthName()
    {
        return ucfirst(strftime("%b", $this->timestamp));
    }

    public function getDay()
    {
        return $this->day;
    }

    public function getMonth()
    {
        return $this->month;
    }

    public function getYear()
    {
        return $this->year;
    }

    public function getTimestamp()
    {
        return $this->timestamp;
    }

    public function __toString()
    {
        return $this->date;
    }

    public function addMonths($month)
    {
        if ($this->month + $month > 12) {
            $this->month = ($month % 12) + 1;
            $this->year += ( (int) ($month / 12));
        } else {
            $this->month++;
        }
        $this->date = $this->year . "-" . sprintf("%02s", $this->month) . "-" . sprintf("%02s", $this->day);
        $this->consolideDate();
        return $this->date;
    }

    public function diffMonths($month)
    {
        if ($this->month - $month < 1) {
            $this->month = 12 - (($month % 12) + 1);
            $this->year -= ( (int) ($month / 12));
        } else {
            $this->month--;
        }
        $this->date = $this->year . "-" . sprintf("%02s", $this->month) . "-" . sprintf("%02s", $this->day);
        $this->consolideDate();
        return $this->date;
    }

    public function addDays($days)
    {
        $this->date = date("Y-m-d", $this->timestamp + $days * 86400);
        $this->consolideDate();
        return $this->date;
    }

    public function diffDays($days)
    {
        $this->date = date("Y-m-d", $this->timestamp - $days * 86400);
        $this->consolideDate();
        return $this->date;
    }

    public function addYears($years)
    {
        $this->year += $years;
        $this->date = $this->year . "-" . sprintf("%02s", $this->month) . "-" . sprintf("%02s", $this->day);
        $this->consolideDate();
        return $this->date;
    }

    public function diffYears($years)
    {
        $this->year -= $years;
        $this->date = $this->year . "-" . sprintf("%02s", $this->month) . "-" . sprintf("%02s", $this->day);
        $this->consolideDate();
        return $this->date;
    }

    public function getUsingFormat($format)
    {
        $datetime = new DateTime($this->date);
        return $datetime->format($format);
    }

    public function getDayOfWeek()
    {
        $datetime = new DateTime($this->date);
        return $datetime->format("l");
    }

    public function diffDate($date)
    {
        $date_parts = explode("-", $date);
        $year = (int) $date_parts[0];
        $month = (int) $date_parts[1];
        $day = (int) $date_parts[2];
        $timestamp = mktime(0, 0, 0, $month, $day, $year);
        return (int) (($this->timestamp - $timestamp) / 86400);
    }

    public function isToday()
    {
        if ($this->date == date("Y-m-d")) {
            return true;
        } else {
            return false;
        }
    }

    public function isYesterday()
    {
        $time = mktime(0, 0, 0, date("m"), date("d"), date("Y")) - 86400;

        if ($this->timestamp == $time) {
            return true;
        } else {
            return false;
        }
    }

    public function isTomorrow()
    {
        $time = mktime(0, 0, 0, date("m"), date("d"), date("Y")) - 86400;
        
        if ($this->timestamp == $time) {
            return true;
        } else {
            return false;
        }
    }

    private function consolideDate()
    {
        $date_parts = explode("-", $this->date);
        $this->year = (int) $date_parts[0];
        $this->month = (int) $date_parts[1];
        $this->day = (int) $date_parts[2];
        $this->timestamp = mktime(0, 0, 0, $this->month, $this->day, $this->year);
    }

}