I forgot to post my traditional "welcome to British Summer Time" greeting this year, and I apologise for the confusion. Every year, we get some new users from the UK who suddenly get very confused about what time it is, and they swear blue that the clock Wikia is using is wrong.
It's not.
WIkia uses UTC, not BST. This means that when the British go on Daylight Savings, as happened a few days ago, British local time skews off Wikia time by an hour.
There is nothing wrong with the clock you see in the upper-right hand corner of our pages, nor with the timestamps that occur when you sign your posts. Most likely if you're seeing an error, you have simply gotten used to there being no difference between Wikia time and your local time, and you now think there is a problem. Alternately, your Special:Preference time settings are set incorrectly, most likely because you failed to allow for Daylight Savings. Thus your account believes it's in a different time zone than you are, leading to a difference between the time on signatures and the time on the clock in the upper right-hand corner.