Which of the two sentences sound natural?
1. I have already submitted it on January 1, 2011.
2. I already submitted it on January 1, 2011.
I learned that we cannot use a present perfect tense with specific time expressions.
Also, I heard that it is unnatural to say "already" in a past tense.
If you want to emphasize "already" and "when it happens", what can you say?
I think that the best way is to say "I already submitted it, on January 1, 2011". By using the comma, the specific date is extra information.
But, having said that, 2 is OK, as it is only trivially different, and even 1 is not noticeably unnatural.
December 2, 2017
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