To enter the Land with no time, you will NEED all 3 amulets from Clockwork underground maze. You should also take a Glass Sphere from Cygnus, this might help you in Land with no time, but you can enter without it.

Then you must BE on Clockwork island at Midnight (even if it's not a cold day, as mentioned the Watcher of time), and enter a rift. You must be the first to enter a rift at midnight, otherwise you will just be teleportated randomly in Athas.

I know 4 locations for rifts in Clockwork, and, I guess there is another one that I haven't found yet (my guess being that they can be used for something else than being teleportated randomly or enter Land without time. I'm working on that now).

As far as I know, there is no scheduled time for the rifts to appear, they just open randomly, so if it's not in a location then hurry to the others.

If on island 1, just avoid the far NE spot of the isle, as there might be a "problem" on this particular location: I had several times a game crash right there, for unknown reason, and some others players had that problem too... I just hope that this spot is not very important for some quests!