Context, context ..... so much depends on it. However, in normal AmEng usage, "in 90 days" is usually equal to saying "in about 90 days", and is seldom meant to convey the level of precision implied by your August 31 date.
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GirlInRedShoesI learnt "in XX days" means something would happen after XX days
"In 90 days we will launch the new social network site."
I wondered whether this sentence has a different meaning from "Within 90 days...." I take "in XX days" to mean as close as possible to XX
GirlInRedShoes Your English is a little bit difficult for meThanks for the tip! I'll try to mend my ways!
Avangi I take "in XX days" to mean as close as possible to XX days, absent context to the contrary. I would never take it as meaning after XX days, absent context. If that's what is meant, there are much better ways to say it.