[There's not good data on it, but all the Sunshine-type worlds plus Yggdrasil show the same time. My clock in the Belltower matched Sunshine after Juliet opened a door; my clock in Atlantis matched when Shell Bell came in, and once the Belltower clocked snapped to my clock in Peace I was awake again and had all my stuff back. If Peace and the Belltower had never unsynced I think I wouldn't have lost hold of it.]