I have a strange problem whereby my iMessage app on 10.9 seems to be 8 minutes behind.
In this example I sent a message at 18:07 (this was the correct time). However the read receipt comes back 8 minutes in the past:

The same happens with the notifications:

It is like my iMessage clock is off by 8 minutes. The time displayed on the menu bar is correct.
In this example I sent a message at 18:07 (this was the correct time). However the read receipt comes back 8 minutes in the past:
The same happens with the notifications:

It is like my iMessage clock is off by 8 minutes. The time displayed on the menu bar is correct.