Partial class, some useful date/time functions

gistfile1.php

class DateFunctions
{

	/**
	 * Get the months in an array since a start date
	 *
	 * @param mixed $start The date to get since
	 * @return array Returns the list of months
	 */
	public static function getMonthsSinceDate($start) {
	    
	    $months = array();
	    
		if (!is_numeric($start)) {
		    $start = strtotime($start);
		}

		$end = date('Ym');

		do {
		    # Get the months
		    $month = date('M Y', $start);
		    $months[$month] = $start; # Set the timestamp
		    $start = strtotime('+1 month +1 day', strtotime($month));

		    # Convert to YYYYMM to compare
		    $check = intval(date('Ym', $start));

		} while ($check <= $end);

	           
	    return $months;
	}

    /**
	 * Get the months in an array since a start date
	 *
	 * @param mixed $start The date to get start
	 * @param mixed $end The date to get ending
	 * @return array Returns the list of months
	 */
    public static function getMonthsInRange($start, $end) {
        
        $months = array()
        
        if (!is_numeric($start)) {
            $start = strtotime($start);
        }

        if (!is_numeric($end)) {
            $end = strtotime($end);
        }

        $end = intval(date('Ym', $end));

        /* Loop through, adding one month to $start each time
        */
        do {
            $month = date('M Y', $start); # Get the month
            $months[$month] = $start; # Set the timestamp
            $start = strtotime('+1 month +1 day', strtotime($month));
            //$start += (SECONDS_PER_DAY * 25);	# Move it up a month

            $check = intval(date('Ym', $start));

        } while ($check <= $end);

           

        return $months;
    }

    /**
	 * Add two time's together (1:30 + 1:30 = 3 hours, not 2.6)
	 * Or 1.80 + 1:80, mixed times. Any decimal over .60 is assumed a fraction
	 *
	 * @param mixed $time1 Time one
	 * @param mixed $time2 Time two
	 * @return mixed Total time
	 *
	 */
	public static function AddTime($time1, $time2)
	{
		$time1 = str_replace(':', '.', $time1);
		$time2 = str_replace(':', '.', $time2);
		
		$time1 = number_format((double)$time1, 2);
		$time2 = number_format((double)$time2, 2);
		
		$time1 = str_replace(',', '', $time1);
		$time2 = str_replace(',', '', $time2);
		
		
		$t1_ex = explode('.', $time1);
		$t2_ex = explode('.', $time2);
		
		# Check if the minutes are fractions
		# If they are (minutes > 60), convert to minutes
		if($t1_ex[1] > 60) {
			$t1_ex[1] = intval((intval($t1_ex[1])*60)/100);
		}
		
		if($t2_ex[1] > 60) {
			$t2_ex[1] = intval((intval($t2_ex[1])*60)/100);
		}
		
		$hours = ($t1_ex[0] + $t2_ex[0]);
		$mins = ($t1_ex[1] + $t2_ex[1]);
					
		while($mins >= 60) {
			$hours++;
			$mins -= 60;
		}
	
		# Add the 0 padding
		if(intval($mins) < 10)
			$mins = '0'.$mins;
		
		$time = number_format($hours.'.'.$mins, 2);
		$time = str_replace(',', '', $time);
		
		return $time;
		#return $hours.'.'.$mins;		
	}
}