I think there is an agenda behind that.
The convention ran from December 15, 1814 to January 6, 1815. News of the signing of the Treaty of Ghent didn't reach the U.S. until February 1815.
February was when the treaty was formally ratified by Congress.
The Treaty of Ghent was signed in December while the Hartford convention was still going on. The British had initiated negotiations in September after a couple of military failures; but it was a US capitulation on the matters of impressment and neutral shipping that ended the war. That change in the US position happened with the consent of the US government and was publicly known before the Hartford convention began.
Is there now? But no agenda behind your claims I assume.
February was when the treaty was formally ratified by Congress.
February was also when word reached the U.S. that the treaty had been signed. Regardless, it was signed on December 30, 1814 and not before the Hartford Convention began as you claimed earlier.
That change in the US position happened with the consent of the US government and was publicly known before the Hartford convention began.
Was it now? But the war was continuing. The burning of Washington, the bombardment of Fort McHenry, the Battle of Plattsburg, the Battle of New Orleans all occurred after the beginning of negotiations. Why should the representatives in Hartford believe that peace was imminent?