+/**
+ * Function to compare two tracks by their first timestamp
+ **/
+int vik_track_compare_timestamp (const void *x, const void *y)
+{
+ VikTrack *a = (VikTrack *)x;
+ VikTrack *b = (VikTrack *)y;
+
+ VikTrackpoint *tpa = NULL;
+ VikTrackpoint *tpb = NULL;
+
+ if ( a->trackpoints )
+ tpa = VIK_TRACKPOINT(g_list_first(a->trackpoints)->data);
+
+ if ( b->trackpoints )
+ tpb = VIK_TRACKPOINT(g_list_first(b->trackpoints)->data);
+
+ if ( tpa && tpb ) {
+ if ( tpa->timestamp < tpb->timestamp )
+ return -1;
+ if ( tpa->timestamp > tpb->timestamp )
+ return 1;
+ }
+
+ if ( tpa && !tpb )
+ return 1;
+
+ if ( !tpa && tpb )
+ return -1;
+
+ return 0;
+}