Allright, i'm running -1 on european standard time and it is accurate for me in the Unites States. What I would suggest is take the time your post occurs, add or subtract when it is supposedly accurate, and pick from there in your user CP.
It's phpBB. It's not supposed to make sense.

EDIT : It's slow by about 8 minutes for me right now, but I figured that's close enough.
The loudest sound at the firing line is 'Click'.
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