wpalchemy_time_ago

<?php

// src: http://www.sajithmr.me/php-time-ago-calculation/
function wpalchemy_time_ago($datefrom,$dateto=-1)
{
	// Defaults and assume if 0 is passed in that
	// its an error rather than the epoch

	if($datefrom<=0) { return "A long time ago"; }
	if($dateto==-1) { $dateto = time(); }

	// Calculate the difference in seconds betweeen
	// the two timestamps

	$difference = $dateto - $datefrom;

	// If difference is less than 60 seconds,
	// seconds is a good interval of choice

	if($difference < 60)
	{
		$interval = "s";
	}

	// If difference is between 60 seconds and
	// 60 minutes, minutes is a good interval
	elseif($difference >= 60 && $difference < 60*60)
	{
		$interval = "n";
	}

	// If difference is between 1 hour and 24 hours
	// hours is a good interval
	elseif($difference >= 60*60 && $difference < 60*60*24)
	{
		$interval = "h";
	}

	// If difference is between 1 day and 7 days
	// days is a good interval
	elseif($difference >= 60*60*24 && $difference < 60*60*24*7)
	{
		$interval = "d";
	}

	// If difference is between 1 week and 30 days
	// weeks is a good interval
	elseif($difference >= 60*60*24*7 && $difference < 60*60*24*30)
	{
	$interval = "ww";
	}

	// If difference is between 30 days and 365 days
	// months is a good interval, again, the same thing
	// applies, if the 29th February happens to exist
	// between your 2 dates, the function will return
	// the 'incorrect' value for a day
	elseif($difference >= 60*60*24*30 && $difference < 60*60*24*365)
	{
		$interval = "m";
	}

	// If difference is greater than or equal to 365
	// days, return year. This will be incorrect if
	// for example, you call the function on the 28th April
	// 2008 passing in 29th April 2007. It will return
	// 1 year ago when in actual fact (yawn!) not quite
	// a year has gone by
	elseif($difference >= 60*60*24*365)
	{
		$interval = "y";
	}

	// Based on the interval, determine the
	// number of units between the two dates
	// From this point on, you would be hard
	// pushed telling the difference between
	// this function and DateDiff. If the $datediff
	// returned is 1, be sure to return the singular
	// of the unit, e.g. 'day' rather 'days'

	switch($interval)
	{
		case "m":
		$months_difference = floor($difference / 60 / 60 / 24 /29);
		while (mktime(date("H", $datefrom), date("i", $datefrom),date("s", $datefrom), date("n", $datefrom)+($months_difference),date("j", $dateto), date("Y", $datefrom)) < $dateto)
		{
			$months_difference++;
		}

		$datediff = $months_difference;

		// We need this in here because it is possible
		// to have an 'm' interval and a months
		// difference of 12 because we are using 29 days
		// in a month

		if($datediff==12)
		{
			$datediff--;
		}

		$res = ($datediff==1) ? "$datediff month ago" : "$datediff months ago";
		break;

		case "y":
		$datediff = floor($difference / 60 / 60 / 24 / 365);
		$res = ($datediff==1) ? "$datediff year ago" : "$datediff years ago";
		break;

		case "d":
		$datediff = floor($difference / 60 / 60 / 24);
		$res = ($datediff==1) ? "$datediff day ago" : "$datediff days ago";
		break;

		case "ww":
		$datediff = floor($difference / 60 / 60 / 24 / 7);
		$res = ($datediff==1) ? "$datediff week ago" : "$datediff weeks ago";
		break;

		case "h":
		$datediff = floor($difference / 60 / 60);
		$res = ($datediff==1) ? "$datediff hour ago" : "$datediff hours ago";
		break;

		case "n":
		$datediff = floor($difference / 60);
		$res = ($datediff==1) ? "$datediff minute ago" : "$datediff minutes ago";
		break;

		case "s":
		$datediff = $difference;
		$res = ($datediff==1) ? "$datediff second ago" : "$datediff seconds ago";
		break;
	}

	return $res;
}