diff --git a/Foundation/src/DateTime.cpp b/Foundation/src/DateTime.cpp
index e92fa19d1..fd1f2c9b7 100644
--- a/Foundation/src/DateTime.cpp
+++ b/Foundation/src/DateTime.cpp
@@ -74,7 +74,7 @@ DateTime::DateTime(int otherYear, int otherMonth, int otherDay, int otherHour, i
 		throw Poco::InvalidArgumentException(Poco::format("Date time is %d-%d-%dT%d:%d:%d:%d:%d\n"
 			"Valid values:\n"
 			"0 <= year <= 9999\n"
-			"1 <= year <= 12\n"
+			"1 <= month <= 12\n"
 			"1 <= day <=  %d\n"
 			"0 <= hour <= 23\n"
 			"0 <= minute <= 59\n"
@@ -175,7 +175,7 @@ DateTime& DateTime::assign(int otherYear, int otherMonth, int otherDay, int othe
 		throw Poco::InvalidArgumentException(Poco::format("Date time is %d-%d-%dT%d:%d:%d:%d:%d\n"
 			"Valid values:\n"
 			"0 <= year <= 9999\n"
-			"1 <= year <= 12\n"
+			"1 <= month <= 12\n"
 			"1 <= day <=  %d\n"
 			"0 <= hour <= 23\n"
 			"0 <= minute <= 59\n"