hi efla.
It's not so easy to eliminate Timezones entirely.
If you only want to remove the string "(GMT-***)" in the sinble schedule view, use this hack.
line 562 in piCal.php
} else {
// 通常イベント(ユーザ時間への時差計算あり)
$tzoffset = intval( ( $this->user_TZ - $this->server_TZ ) * 3600 ) ;
$disp_user_tz = $this->get_tz_for_display( $this->user_TZ ) ;
$start_time_str = date( _PICAL_DTFMT_TIME , $event->start + $tzoffset ) . " $disp_user_tz" ;
$end_time_str = date( _PICAL_DTFMT_TIME , $event->end + $tzoffset ) . " $disp_user_tz" ;
if( $this->user_TZ != $event->event_tz ) {
$tzoffset_s2e = intval( ( $event->event_tz - $this->server_TZ ) * 3600 ) ;
$disp_event_tz = $this->get_tz_for_display( $event->event_tz ) ;
$start_time_str .= " <small>" . date( "d " . _PICAL_DTFMT_TIME , $event->start + $tzoffset_s2e ) . " $disp_event_tz</small>" ;
$end_time_str .= " <small>" . date( "d " . _PICAL_DTFMT_TIME , $event->end + $tzoffset_s2e ) . " $disp_event_tz</small>" ;
}
}