to this day, until today, till today, so far
Is there any difference between these?
To this day, until today, till today and so far

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no, they are used interchangeably​.

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thanks all of you

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The only difference is that "till today" is less formal than the other two but they all mean the same thing. The dictionary mentions these synonyms as well: up to this point, up to now, as yet, thus far, hitherto, up to the present, to date

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also "to date" means "to this day"