Properly fetch the local date / time in WordPress based on a Unix timestamp.

local-time.php

<?php

/**
 * Fetch the local date/time in WordPress based on a Unix timestamp.
 * 
 * @param int $timestamp
 * @param string $format
 * @return string
 */
function get_wp_local_date_time( $timestamp, $format = '' ) {
	$format = !empty( $format ) ? $format: get_option('date_format') . ' ' . get_option('time_format');
	if( ! $timezone = get_option('timezone_string') ) {
		$timezone = date_default_timezone_get();
	}
	date_default_timezone_set( $timezone );
	return date_i18n( $format, $timestamp );
}