Fuller's Account of Battle Date 

The battle date is shortly after June 21-22, 168 B.C., after a recorded eclipse of the Moon, but the exact date is not known, according to J.F.C. Fuller.  The Macedonians reportedly had some kind of outcry that defeat was at hand for them until the eclipse passed, and the Romans were given an explanation that the eclipse is part of nature and natural, so the Romans did not panic.