Since the last snapshot at least, clocks in item frames will always show the same time (mid-day), no matter what time of day it really is.
(Compare the clock in the inventory with the one visible at the right in the screenshot)
MC-91651
Clock not moving in item Frame
Resolved
Duplicate
0
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-85029. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.