Passage: There were informal contacts between the AFO and the Allies in 1944 and 1945 through the British Force 136. On 27 March 1945, the Burma National Army rose up in a country-wide rebellion against the Japanese. 27 March had been celebrated as 'Resistance Day' until the military renamed it 'Tatmadaw (Armed Forces) Day'. Aung San and others subsequently began negotiations with Lord Mountbatten and officially joined the Allies as the Patriotic Burmese Forces (PBF). At the first meeting, the AFO represented itself to the British as the provisional government of Burma with Thakin Soe as Chairman and Aung San as a member of its ruling committee.The Japanese were routed from most of Burma by May 1945. Negotiations then began with the British over the disarming of the AFO and the participation of its troops in a post-war Burma Army. Some veterans had been formed into a paramilitary  force under Aung San, called the Pyithu yèbaw tat or People's Volunteer Organisation (PVO), and were openly drilling in uniform. The absorption of the PBF was concluded successfully at the Kandy conference in Ceylon in September 1945.

Question: What years were their informal contacts?
1944 and 1945