remove start date from UID

close #28

lib/event.js

@@ -565,7 +565,7 @@ var ICalEvent = function(_data) {
 
         // DATE & TIME
         g += 'BEGIN:VEVENT\r\n';
-        g += 'UID:' + tools.formatDate(data.start) + '-' + data.id + '@' + calendar.domain() + '\r\n';
+        g += 'UID:' + data.id + '@' + calendar.domain() + '\r\n';
         g += 'DTSTAMP:' + tools.formatDate(data.stamp) + '\r\n';
         if(data.allDay) {
             g += 'DTSTART;VALUE=DATE:' + tools.formatDate(data.start, true) + '\r\n';