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Yes, it is certainly possible that he got the dates wrong, as he wrote down his memories many years later.  He mentions in one 1944 entry that the expected bombing had not begun.  Regarding the Long March, he says the entire camp was marched out in Dec 1944 but then inexplicably marched back and then marched out again the next day.  He and his friend stayed on in Dorf Lager and a Russian patrol arrived a few days later, which as you say was late January - so his dates don't fit.