diff --git a/LibOneM2M/OneM2M_Functions.ttcn b/LibOneM2M/OneM2M_Functions.ttcn
index 73d191e8afcd1ae3c1915342789bc55945203a6b..6650b1657d244bbf2309765628272b0d34d6a92c 100644
--- a/LibOneM2M/OneM2M_Functions.ttcn
+++ b/LibOneM2M/OneM2M_Functions.ttcn
@@ -4848,9 +4848,7 @@ module OneM2M_Functions {
 			var integer i;
 			
 			for(i := 4; i <= 5; i := i+1){
-				if(p_timestamp[i] != "0") {
-					v_month := v_month & p_timestamp[i];
-				}
+				v_month := v_month & p_timestamp[i];
 			}
 			return str2int(v_month);