...with Vanarama National League leaders Cheltenham Town until the end of the season.
The former Kilmarnock and Oldham Athletic midfielder signed for the Robins back in October and has made eleven appearances for Gary Johnson's side.
Cheltenham boss Johnson said: " I'm really pleased that James has signed for the rest of the season with a view to extend in the summer. Experienced players like Dayton don't come around every day.
"He was unlucky with his hamstring injury when getting to full fitness last month but players like him will be invaluable for the remainder of this season."
Having extended his contract today, Dayton is now eligible and in line to feature in tomorrow's FA Trophy replay against Oxford City at the World of Smile Stadium.