Warning: date() expects parameter 2 to be long, string error

[ManjilShahi]

I use the theme as an affiliate deals aggregator. I am using WP all import plugin to import deals from xml files. On import, I face a major problem concerning the expire date as in every xml, it is in the format: “2015-04-23 00:00:00”, while your theme requires UNIX timestamp and can not convert. 

I used strtotime() in wp all import to convert date to timestamp in real time.

But im getting this error :

Warning: date() expects parameter 2 to be long, string given in /home/xxxx/xxxxx.com/wp-includes/functions.php on line 112/114/116 and 117

The functions.php file :

function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
	global $wp_locale;
	$i = $unixtimestamp;

	if ( false === $i ) {
		if ( ! $gmt )
			$i = current_time( 'timestamp' );
		else
			$i = time();
		// we should not let date() interfere with our
		// specially computed timestamp
		$gmt = true;
	}

	/*
	 * Store original value for language with untypical grammars.
	 * See https://core.trac.wordpress.org/ticket/9396
	 */
	$req_format = $dateformatstring;

	$datefunc = $gmt? 'gmdate' : 'date';

	if ( ( !empty( $wp_locale->month ) ) && ( !empty( $wp_locale->weekday ) ) ) {
		$datemonth = $wp_locale->get_month( $datefunc( 'm', $i ) );-----------LINE 112
		$datemonth_abbrev = $wp_locale->get_month_abbrev( $datemonth );
		$dateweekday = $wp_locale->get_weekday( $datefunc( 'w', $i ) );------LINE 114
		$dateweekday_abbrev = $wp_locale->get_weekday_abbrev( $dateweekday );
		$datemeridiem = $wp_locale->get_meridiem( $datefunc( 'a', $i ) );----LINE 116
		$datemeridiem_capital = $wp_locale->get_meridiem( $datefunc( 'A', $i) );------LINE 117
		$dateformatstring = ' '.$dateformatstring;
		$dateformatstring = preg_replace( "/([^\\\])D/", "\\1" . backslashit( $dateweekday_abbrev ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])F/", "\\1" . backslashit( $datemonth ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])l/", "\\1" . backslashit( $dateweekday ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])M/", "\\1" . backslashit( $datemonth_abbrev ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])a/", "\\1" . backslashit( $datemeridiem ), $dateformatstring );
		$dateformatstring = preg_replace( "/([^\\\])A/", "\\1" . backslashit( $datemeridiem_capital ), $dateformatstring );

		$dateformatstring = substr( $dateformatstring, 1, strlen( $dateformatstring ) -1 );
	}

 

[requinix]

Looks like something is calling date_i18n() with a $unixtimestamp that isn't a number... Do you have any ideas where that may be? Look for a place that's showing bad date strings.