If the computer clock is too far off you may have problems with the security certificate and have trouble logging in. Quests and such in-game though have timers that go off the server clock, so what your computer clock says is irrelevant.
Originally Posted by Thornglen
"Everyone's got one. Better to be a smart one than a dumb one." - me
"It's people like you that [I]think[/I] you know everything that give those of us that [I]do[/I] a bad name." - me
"Eat, drink, and be Merry, 'cause Pippin was a fool of a Took."