Merge pull request #33 from eugenedina/issue-32

Issue 32 - Shifted day when viewing expanded month and start day is Monday.

lib/flutter_neat_and_clean_calendar.dart

@@ -949,7 +949,8 @@ class _CalendarState extends State<Calendar> {
   List<DateTime> _daysInMonth(DateTime month) {
     var first = Utils.firstDayOfMonth(month);
     var daysBefore = first.weekday;
-    var firstToDisplay = first.subtract(new Duration(days: daysBefore - 1));
+    var firstToDisplay = first.subtract(
+        new Duration(days: daysBefore - (widget.startOnMonday ? 1 : 0)));
     var last = Utils.lastDayOfMonth(month);
 
     var daysAfter = 7 - last.weekday;
@@ -959,9 +960,10 @@ class _CalendarState extends State<Calendar> {
       daysAfter = 7;
     }
 
-    // Adding an extra day necessary. Otherwise the week with days in next month
-    // would always end on Saturdays.
-    var lastToDisplay = last.add(new Duration(days: daysAfter + 1));
+    // Adding an extra day necessary (if week starts on Monday).
+    // Otherwise the week with days in next month would always end on Saturdays.
+    var lastToDisplay = last.add(
+        new Duration(days: daysAfter + (widget.startOnMonday ? 1 : 0)));
     return Utils.daysInRange(firstToDisplay, lastToDisplay).toList();
   }
 }