vbdate and negative unix timestamp?

[boggseric]

I am having an issue with a mod displaying the date incorrectly when the unix timestamp is a negative value. Is vbdate setup to handle the negative unix timestamp correctly?

The value of $thispurchdate is -224406000 (11/21/1962) After the line is run below $purchase_date shows up as 12/31/1969.

$purchase_date = vbdate($vbulletin->options['dateformat'], $thispurchdate, true);

vbdate code:

// #############################################################################
/**
* Formats a UNIX timestamp into a human-readable string according to vBulletin prefs
*
* Note: Ifvbdate() is called with a date format other than than one in $vbulletin->options[],
* set $locale to false unless you dynamically set the date() and strftime() formats in the vbdate() call.
*
* @param	string	Date format string (same syntax as PHP's date() function)
* @param	integer	Unix time stamp
* @param	boolean	If true, attempt to show strings like "Yesterday, 12pm" instead of full date string
* @param	boolean	If true, and user has a language locale, use strftime() to generate language specific dates
* @param	boolean	If true, don't adjust time to user's adjusted time .. (think gmdate instead of date!)
* @param	boolean	If true, uses gmstrftime() and gmdate() instead of strftime() and date()
* @param array    If set, use specified info instead of $vbulletin->userinfo
*
* @return	string	Formatted date string
*/
function vbdate($format, $timestamp = TIMENOW, $doyestoday = false, $locale = true, $adjust = true, $gmdate = false, $userinfo = '')
{
	global $vbulletin, $vbphrase;
	$uselocale = false;

	if (defined('VB_API') AND VB_API === true)
	{
		$doyestoday = false;
	}

	if (is_array($userinfo) AND !empty($userinfo))
	{
		if ($userinfo['lang_locale'])
		{
			$uselocale = true;
			$currentlocale = setlocale(LC_TIME, 0);
			setlocale(LC_TIME, $userinfo['lang_locale']);
			if (substr($userinfo['lang_locale'], 0, 5) != 'tr_TR')
			{
				setlocale(LC_CTYPE, $userinfo['lang_locale']);
			}
		}
		if ($userinfo['dstonoff'])
		{
			// DST is on, add an hour
			$userinfo['timezoneoffset']++;
			if (substr($userinfo['timezoneoffset'], 0, 1) != '-')
			{
				// recorrect so that it has a + sign, if necessary
				$userinfo['timezoneoffset'] = '+' . $userinfo['timezoneoffset'];
			}
		}
		$hourdiff = (date('Z', TIMENOW) / 3600 - $userinfo['timezoneoffset']) * 3600;
	}
	else
	{
		$hourdiff = $vbulletin->options['hourdiff'];
		if ($vbulletin->userinfo['lang_locale']  AND !(defined('VB_API') AND VB_API === true))
		{
			$uselocale = true;
		}
	}

	if ($uselocale AND $locale)
	{
		if ($gmdate)
		{
			$datefunc = 'gmstrftime';
		}
		else
		{
			$datefunc = 'strftime';
		}
	}
	else
	{
		if ($gmdate)
		{
			$datefunc = 'gmdate';
		}
		else
		{
			$datefunc = 'date';
		}
	}
	if (!$adjust)
	{
		$hourdiff = 0;
	}
	$timestamp_adjusted = max(0, $timestamp - $hourdiff);

	if ($format == $vbulletin->options['dateformat'] AND $doyestoday AND $vbulletin->options['yestoday'])
	{
		if ($vbulletin->options['yestoday'] == 1)
		{
			if (!defined('TODAYDATE'))
			{
				define ('TODAYDATE', vbdate('n-j-Y', TIMENOW, false, false));
				define ('YESTDATE', vbdate('n-j-Y', TIMENOW - 86400, false, false));
				define ('TOMDATE', vbdate('n-j-Y', TIMENOW + 86400, false, false));
			}

			$datetest = @date('n-j-Y', $timestamp - $hourdiff);

			if ($datetest == TODAYDATE)
			{
				$returndate = $vbphrase['today'];
			}
			else if ($datetest == YESTDATE)
			{
				$returndate = $vbphrase['yesterday'];
			}
			else
			{
				$returndate = $datefunc($format, $timestamp_adjusted);
			}
		}
		else
		{
			$timediff = TIMENOW - $timestamp;

			if ($timediff >= 0)
			{
				if ($timediff < 120)
				{
					$returndate = $vbphrase['1_minute_ago'];
				}
				else if ($timediff < 3600)
				{
					$returndate = construct_phrase($vbphrase['x_minutes_ago'], intval($timediff / 60));
				}
				else if ($timediff < 7200)
				{
					$returndate = $vbphrase['1_hour_ago'];
				}
				else if ($timediff < 86400)
				{
					$returndate = construct_phrase($vbphrase['x_hours_ago'], intval($timediff / 3600));
				}
				else if ($timediff < 172800)
				{
					$returndate = $vbphrase['1_day_ago'];
				}
				else if ($timediff < 604800)
				{
					$returndate = construct_phrase($vbphrase['x_days_ago'], intval($timediff / 86400));
				}
				else if ($timediff < 1209600)
				{
					$returndate = $vbphrase['1_week_ago'];
				}
				else if ($timediff < 3024000)
				{
					$returndate = construct_phrase($vbphrase['x_weeks_ago'], intval($timediff / 604900));
				}
				else
				{
					$returndate = $datefunc($format, $timestamp_adjusted);
				}
			}
			else
			{
				$returndate = $datefunc($format, $timestamp_adjusted);
			}
		}
	}
	else
	{
		$returndate = $datefunc($format, $timestamp_adjusted);
	}

	if (!empty($userinfo['lang_locale']))
	{
		setlocale(LC_TIME, $currentlocale);
		if (substr($currentlocale, 0, 5) != 'tr_TR')
		{
			setlocale(LC_CTYPE, $currentlocale);
		}
	}
	return $returndate;
}