custom bookingsstart placeholder

// create #_REGOSTART (for in event list)
function em_rego_start( $replace, $EM_Event, $result ) {
    if ( $result == '#_REGOSTART' ) {

        // IMPORTANT : DST OFFSET MUST BE SET
        $tz_offset = get_option( 'gmt_offset' );
        $tz_diff   = '+' . get_option( 'gmt_offset' ) . ' hours';
        if ( $tz_offset == 1 ) {
            $dst = 'CET';
        } else if ( $tz_offset == 2 ) {
            $dst = 'CEST';
        }
        $now = date( 'Y-m-d  H:i:s', strtotime( $tz_diff ) );

        global $EM_Event;
        $regostart = "";
        $min       = 0;
        $max       = 0;
        foreach ( $EM_Event->get_tickets()->tickets as $EM_Ticket ) {
            /* @var $EM_Ticket EM_Ticket */
            if ( $EM_Ticket->is_available() || get_option( 'dbem_bookings_tickets_show_unavailable' ) ) {
                if ( current_user_can( 'access_s2member_level2' ) ) {
                    if ( $EM_Ticket->ticket_start < $min || $min == 0 ) {
                        $min = $EM_Ticket->ticket_start;
                    }
                } else {
                    if ( $EM_Ticket->ticket_start > $min ) {
                        $min = $EM_Ticket->ticket_start;
                    }
                }
            }
        }
        // if ( $min === false ) { $min = 0; }
        $regostart = $min;

        if ( ! $EM_Event->event_rsvp && get_option( 'dbem_rsvp_enabled' ) ) { // if no bookings are enabled

            $replace = 't.b.a.';

        } else { // if bookings are enabled

            $rsvp        = '';
            $rsvp        .= $EM_Event->event_rsvp_date;
            $rsvp        .= ' ';
            $rsvp        .= $EM_Event->event_rsvp_time;
            $date_format = date( "j/n @ H:i", strtotime( $regostart ) );
            $nowstring   = strtotime( $now );
            $startstring = strtotime( $regostart );
            $endstring   = strtotime( $rsvp );

            if ( ! empty( $startstring ) ) { // if start date is set
                if ( $nowstring > $startstring ) { // if start date has passed
                    if ( $nowstring > $endstring ) { // if end date has passed
                        $replace = 'Closed';
                    } else {
                        // to create: if ticket is closed but rsvp date is not passed
                        $get_places     = $EM_Event->get_spaces(); // total spaces
                        $booked_places  = $EM_Event->get_bookings()->get_booked_spaces();   // confirmed bookings
                        $pending_places = $EM_Event->get_bookings()->get_pending_spaces();  // pending spaces
                        $available      = $get_places - $booked_places - $pending_places;
                        $is_open        = $EM_Event->get_bookings()->is_open(); // whether there are any available tickets right now
                        if ( $available > 0 ) { // if available tickets is more than 0
                            if ( is_user_logged_in() && ! current_user_can( 'access_s2member_level1' ) ) {
                                // $replace = 'Now open, but you need to renew your IDF membership first.';
                                $replace = 'Open *';
                            } else if ( current_user_can( 'access_s2member_level1' ) ) {
                                if ( $is_open ) {
                                    $replace = 'Open';
                                } else {
                                    $replace = 'Closed';
                                }
                            } else {
                                $replace = 'Open';
                            }

                        } else {
                            $replace = '<b>Sold out !</b>';
                        }
                    }
                } else { // if start date hasn't passed

                    // IMPORTANT : DST MUST BE SET CORRECTLY
                    $replace = $date_format;

                }
            } else {
                $replace = "t.b.a.";
            }
        }
    }
    return $replace;
}
add_filter('em_event_output_placeholder','em_rego_start', 1, 4);