Three days before the day after tomorrow is Monday. What day is today?

[math_celebrity]

Three days before the day after tomorrow is Monday. What day is today?

List out days of the week:
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Three days before the day after tomorrow means we start 2 days from now, and go back three days to get to Monday.
Which means it's a +1 day gain. Monday + 1 = Tuesday