Is
私は水曜日本に行きます。
a reasonable way to say "I'm going to Japan Wednesday."?
If it is, is this also okay?
水曜、私は日本に行きます。
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私は水曜日本に行きます。
a reasonable way to say "I'm going to Japan Wednesday."?
If it is, is this also okay?
水曜、私は日本に行きます。
You need to say 水曜日 rather than just 水曜.
It might also be preferable to use へ instead of に
but other than that your sentences will work.
私は水曜日、日本に行きます。
and
水曜日、私は日本に行きます。
Best per Tomono-san is
私は水曜日に日本へ行きます。