+ // Look for DTSTART.
+
+ for (vector<string>::iterator iter = ObjectName.begin();
+ iter != ObjectName.end(); iter++){
+
+ try{
+ PropertyName = ObjectName[SeekCount].substr(0,7);
+ }
+
+ catch(const out_of_range& oor){
+ continue;
+ }
+
+ if (PropertyName == "DTSTART"){
+
+ if (ValidDateTimeStart == false){
+ ValidDateTimeStart = true;
+ } else {
+ return CALENDAROBJECTVALID_INVALIDFORMAT;
+ }
+
+ }
+
+ SeekCount++;
+
+ }
+
+ SeekCount = 0;
+