AccountInfo history statistics query

WotBlitzStatisticsPro.Logic/Calculations/DateTimeHelper.cs

@@ -12,6 +12,12 @@ namespace WotBlitzStatisticsPro.Logic.Calculations
             return dtDateTime;
         }
 
+		public static int ToUnixTimestamp(this DateTime date)
+        {
+            var diff = date - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
+            return Convert.ToInt32(diff.TotalSeconds);
+        }
+
 
 	}
 }