<?php
 
	//=====================================================
	//		REFERENCE
	//=====================================================
	//60 Seconds
	// 1 minute = 60 seconds
	// 1 month	= 
			// 31 days = 2678400
			// 30 days = 2592000
			// 28 days = 2419200
	// 1 hour 	= 3600 seconds
	// 1 day  	= 86400 seconds
	// 1 week	= 604800 seconds
	// 1 year	= 31536000 seconds
	//=====================================================
 
	echo displayago();
 
	function displayago()
	{
 
		$datePublished = mktime(11, 33, 0, 5, 2, 2009);
		echo 'Date Published: ' . date('l F j, Y ', $datePublished) . ' at '. strftime('%H:%M%p', $datePublished) .  '<br/>';
 
		$dateNow = getdate();
		$dateNow = mktime($dateNow['hours'], $dateNow['minutes'], $dateNow['seconds'], $dateNow['mon'], $dateNow['mday'], $dateNow['year']);
		echo 'Todays Date: ' . date('l F j, Y ', $dateNow) . ' at '. strftime('%H:%M%p', $dateNow) .  '<br/>';
		echo '<br/>';
 
		$totalSeconds	= $dateNow - $datePublished;
 
		$yearSeconds	= 31536000; //31536000 seconds in a year
		//$monthSeconds	= '';
		$weekSeconds	= 604800; 	// 604800 seconds in a week
		$daySeconds 	= 86400; 	// 86400 seconds in a day
		$hourSeconds 	= 3600; 	//3600 seconds in a minute 
		$minuteSeconds 	= 60; 		//60 seconds
		$seconds 		= 1;
 
		$result = '';
 
		//calculate total leap years
		$totalLeapYears = totalLeapYears(date('Y', $datePublished),$dateNow['year']);
 
		//calculate years
		$years = round($totalSeconds/$yearSeconds);
		if($years >= 1)
		{
			if($years == 1)
			{
				$result .= $years . ' <b>year</b> ';								
			}
			else
			{
				$result .= $years . ' <b>years</b> ';				
			}
		}
		else
		{
			$result .= '0 <b>years</b> ';
		}
 
		//calculate months
		$months = round();
 
		//calculate weeks
 
		//calculate days
		$days = round($totalSeconds/$daySeconds);
		if($days >= 365)
		{
			$days = $days - 365;
		}
		if($days >= 1)
		{
			if(round($days) == 1)
			{
				$result .= round($days) . ' <b>day</b> ';					
			}
			else
			{
				$result .= round($days) . ' <b>days</b> ';				
			}
		}
		else
		{
			$result .= '0 <b>days</b> ';
		}
 
		//calculate hours
		$hours = round($totalSeconds/$hourSeconds);
		if($hours >= 1)
		{
			if($hours == 1)
			{
				$result .= $hours . ' <b>hour</b> ';
			}
			else
			{
				$result .= $hours . ' <b>hours</b> ';
			}
		}
		else
		{
			$result .= '0 <b>hours</b> ';
		}
 
		//calculate minutes
		$minutes = round($totalSeconds/$minuteSeconds);
		if($minutes >= 1)
		{
			if($minutes == 1)
			{
				$result .= $minutes . ' <b>minute</b> ';
			}
			else
			{
				$result .= $minutes . ' <b>minutes</b> ';
			}
		}
		else
		{
			$result .= '0 <b>minutes</b> ';
		}
 
		//calculate seconds
		$seconds = $totalSeconds/$seconds;
		if($seconds >= 1)
		{
			if($seconds == 1)
			{
				$result .= $seconds . ' <b>second</b> ';				
			}
			else
			{
				$result .= $seconds . ' <b>seconds</b> ';
			}
		}
		else
		{
			$result .= '0 <b>seconds</b> ';			
		}
 
		$result .= ' ago';
 
		return $result;
	}
 
	//=====================================================================
	//	UTILITY FUNCTIONS
	//=====================================================================	
	/*
		Returns the total amount of years between
		a certain amount of years.
 
		@return
	*/
	function totalLeapYears($startYear, $endYear)
	{
		$result = 0;
		for($i = $startYear; $i < $endYear; $i++) 
		{
			if(date('L', strtotime("$i-01-01")))
			{
				$result += 1;
			}
		}
		return $result;
	}
 
	/*
		Returns the total amount of days per year,
		checking for leap year
 
		@return
	*/
	function getTotalDays($isleapyear = false)
	{
		if($isleapyear)
		{
			return 366;
		}
 
		return 365;
	}
 
	/*
		Returns the total amount of days per month,
		checking for leap year as well (February)
 
		@return
	*/
	function getDays($month, $isleapyear = false)
	{
		switch($month)
		{
			case 'January':
				return 31;
				break;
			case 'February':
				if($isleapyear)
				{
					//is leap year
					return 29;
				}
				else
				{
					//is not leap year
					return 28;					
				}
				break;
			case 'March':
				return 31;
				break;
			case 'April':
				return 30;
				break;
			case 'May':
				return 31;
				break;
			case 'June':
				return 30;
				break;
			case 'July':
				return 31;
				break;
			case 'August':
				return 31;
				break;
			case 'September':
				return 30;
				break;
			case 'October':
				return 31;
				break;
			case 'November':
				return 30;
				break;
			case 'December':
				return 31;
				break;
			default:
				break;
		}
	}
	//=====================================================================
 
?>