50G why does <<time>> dissapear

[CosmicTruth]

if I press the time softkey i get the current time, if i write a program like <<time>> and run it i don't get the time on the stack. even if i put 'time' on the stack and evaluate it still no time on the stack. i bet its a simple thing but i'm baffeled by the dissapearing <<time>>. what function on a 50G can I program that will give a time number on the stack? I heard Carl Sagan say this may happens when we are entering a black hole...