How 二週間 can be used to say "In two weeks..."

Question

How can one use 二週間 to say, "In two weeks from today, I am going to Tokyo."

I am confused on how one would use particles here and I need some help.

Answer 1

If it were me, I would say

今日から二週間後[に]、東京へ行く。

I don't think 後 is usually considered a particle (助詞).

二週間 = a duration of two weeks. So you need to express after that duration has passed.

Answer 2

Two other ways to say this:

二週間したら東京へ行く。

二週間[経]{た}ったら東京へ行く。

The verb する in the first one is roughly equivalent to the verb 経つ in the second one, and both mean "to pass time".