1 files changed, 50 insertions, 0 deletions
diff --git a/src/domain/Month.cs b/src/domain/Month.cs
new file mode 100644
index 0000000..6ca47ab
--- /dev/null
+++ b/src/domain/Month.cs
@@ -0,0 +1,50 @@
+namespace domain
+{
+  using System;
+
+  public class Month
+  {
+    int year;
+    int month;
+
+    public Month(int year, int month)
+    {
+      this.year = year;
+      this.month = month;
+    }
+
+    public bool Equals(Month other)
+    {
+      if (ReferenceEquals(null, other)) return false;
+      if (ReferenceEquals(this, other)) return true;
+      return other.year == year && other.month == month;
+    }
+
+    public override bool Equals(object obj)
+    {
+      if (ReferenceEquals(null, obj)) return false;
+      if (ReferenceEquals(this, obj)) return true;
+      if (obj.GetType() != typeof (Month)) return false;
+      return Equals((Month) obj);
+    }
+
+    public override int GetHashCode()
+    {
+      unchecked
+      {
+        return (year*397) ^ month;
+      }
+    }
+
+    public Month Plus(int months)
+    {
+      var newMonth = new DateTime(year, month, 01).AddMonths(months);
+      return new Month(newMonth.Year, newMonth.Month);
+    }
+
+    public override string ToString()
+    {
+      return string.Format("{0} {1}", year, month);
+    }
+  }
+}