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.
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2015-06-13T06:29:01.527
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particles time
How 二週間 can be used to say "In two weeks..."
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.
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2015-06-13T10:11:49.443
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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".
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2016-02-09T13:37:16.660
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