Revize cf35739b

Refs #9051, #9050. Added more tests + fixed some bugs revealed by the tests.

Server/ServerApp/DataDownload/Date.cs

@@ -12 +12 @@
 		public uint Year { get; }
 		public Date(uint month, uint year)
 		{
-			if (month == 0)
-				throw new ArgumentOutOfRangeException("month", "Month must be positive and not zero.");
+			if (month == 0 || month > 12)
+				throw new ArgumentOutOfRangeException("month", "Month must be positive and not zero and less or equal to 12.");
 			this.Month = month;
 			this.Year = year;
 		}