IMessage - I changed the time on macbook pro and now it won't let me log in. All contacts are shown in red.

I have a macbook pro, bought new in Sept 2011.
Yesterday, I changed the date (forwarded it to 2020 - for a silly reason) and then changed it back. Now my iMessage on the macbook shows up that all contacts are offline and when I can't log in.
I've trawled through a number of the already-existing threads on this and tried a few things - in Terminal, or in Systems Prefs but can't get it to work.
Any thoughts?
Thanks, Pádraig.

Log out or restart the computer and try again. Make sure the date is now correct.

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IMessage - I changed the time on macbook pro and now it won't let me log in. All contacts are shown in red.

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