Am I missing something অথবা did Anderson make a big mess up in the time line when লেখা Afterlife?? According to the পূর্ববর্তি movies&my math at the begining of the movie when it says "four years later" it should be SIX!!???

Alice makes it clear upon meeting up w/ clair again its been a বছর and half sence getting the chopper in the desert. And when finding clair in alaska its six months after the attack on the জাপান facility.so from this আপনি can see it took alice and her clones a বছর to reach japan. If আপনি do the math w/ the first three films আপনি know its been 5years allready at the end of extinction.add a বছর and আপনি got SIX!!!!??