CURRENT_DATE and CURRENT_TIME functions disabled?

[Heri Ramampiaro]

Anyone knows why these values in 
"asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java”
 are false?

addFunction(CURRENT_DATE, ADateTypeComputer.INSTANCE, false);
addFunction(CURRENT_TIME, ATimeTypeComputer.INSTANCE, false);

Thanks,
-heri