TI-100: Fix expansion of :lastquarter when in first quarter

AUTHORS

@@ -58,3 +58,4 @@ suggestions:
   Bodo Graumann
   Lynoure
   Tim Ruffing
+  Andreas Poisel

ChangeLog

@@ -70,7 +70,9 @@
           (thanks to Tim Ruffing)
 - TI-90   Let 'continue' accept a date or a date range
 - TI-91   Timewarrior does not compile on DragonFly
-          (thanks to Michael Neumann).
+          (thanks to Michael Neumann)
+- TI-100  :lastquarter throws exception in first quarter
+          (thanks to Andreas Poisel)
 - Fixed Python 3 support of the holiday/refresh script
           (thanks to Jelle van der Waa).
 - Added missing man page link

src/helper.cpp

@@ -260,8 +260,13 @@ bool expandIntervalHint (
 
     m = ((q - 1) * 3) + 1;
 
-    range.start = Datetime (y, m,     1);
-    range.end   = Datetime (y, m + 3, 1);
+    range.start = Datetime (y, m, 1);
+
+    m += 3;
+    y += m/12;
+    m %= 12;
+
+    range.end   = Datetime (y, m, 1);
 
     debug (format ("Hint {1} expanded to {2} - {3}",
                    hint,