add timezone information in ics feed

src/model/planned_event.rs

@@ -211,7 +211,26 @@ FROM user_trip WHERE trip_details_id = (SELECT trip_details_id FROM planned_even
             r#"BEGIN:VCALENDAR
 VERSION:2.0
 PRODID:-//rudernlinz.at//Trips//DE
-X-WR-CALNAME:Ruderausfahrten"#,
+X-WR-CALNAME:Ruderausfahrten
+BEGIN:VTIMEZONE
+TZID:Europe/Vienna
+TZURL:http://tzurl.org/zoneinfo-outlook/Europe/Vienna
+X-LIC-LOCATION:Europe/Vienna
+BEGIN:DAYLIGHT
+TZOFFSETFROM:+0100
+TZOFFSETTO:+0200
+TZNAME:CEST
+DTSTART:19700329T020000
+RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU
+END:DAYLIGHT
+BEGIN:STANDARD
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+TZNAME:CET
+DTSTART:19701025T030000
+RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU
+END:STANDARD
+END:VTIMEZONE"#,
         );
 
         let events = PlannedEvent::all(db).await;