I have been using trade regularly and never had a problem,
When I logged in last night I couldn't put up a trade offer because it said next offer available in 11 d 6 h 40 min.
I refreshed and it was still like it and have since logged out and in again hours later to find the problem is still there.
I asked other players on Global chat and no one else had experienced anything similar.
I reported the problem to help-and-support