Timberdate-filter for Twig, to use in combination with Wordpress & Timber

gistfile1.txt

Add to something like functions.php

// https://www.skyverge.com/blog/down-the-rabbit-hole-wordpress-and-timezones/
function wp_get_timezone_string() {

    // if site timezone string exists, return it
    if ( $timezone = get_option( 'timezone_string' ) )
        return $timezone;

    // get UTC offset, if it isn't set then return UTC
    if ( 0 === ( $utc_offset = get_option( 'gmt_offset', 0 ) ) )
        return 'UTC';

    // adjust UTC offset from hours to seconds
    $utc_offset *= 3600;

    // attempt to guess the timezone string from the UTC offset
    if ( $timezone = timezone_name_from_abbr( '', $utc_offset, 0 ) ) {
        return $timezone;
    }

    // last try, guess timezone string manually
    $is_dst = date( 'I' );

    foreach ( timezone_abbreviations_list() as $abbr ) {
        foreach ( $abbr as $city ) {
            if ( $city['dst'] == $is_dst && $city['offset'] == $utc_offset )
                return $city['timezone_id'];
        }
    }

    // fallback to UTC
    return 'UTC';
}

add_filter('get_twig', function($twig) {
    $twig->addFilter('timberdate', new Twig_Filter_Function(function($timestamp, $format) {
		$dt = new DateTime();
		$year = (int)date('Y', $timestamp);

		if ($year < 1900 || $year > 3000) {
			$timestamp = $timestamp / 1000;
		}

        $dt->setTimestamp($timestamp);
        $dt->setTimezone(new DateTimeZone(
        	wp_get_timezone_string()
        ));
        return $dt->format($format);
    }));
    return $twig;
});