This has been how it worked until [date].
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AnonymousCan you please explain why the original is wrong?You cannot use present perfect with a specific past date.
Mister MicawberYou cannot use present perfect with a specific past date.The sentence you gave was
OttoJ how come the present perfect, has been, is used?The writer/speaking is supplying a piece of new information, and it also may work like that again in the future. Present perfect could have been used for either reason. Past perfect only works with two past dates.