When researching adding next day of week to the date parser I had trouble with the ambiguity of the word next. I consulted a friend who is a college English professor and here's the result.
- last <day of week>
- The closest day previous to yesterday. If today is Wednesday, last Tuesday would not be yesterday but eight days ago. Last Monday would be two days ago.
- this <day of week>
- The closest day following today. It could be said that this is equal to this coming. If today is Wednesday, this Tuesday would be the six days from today and this Thursday would be tomorrow.
- next <day of week>
- The day of the week in the week following this week, but not tomorrow. If today is Saturday, next Sunday would not be tomorrow but eight days from today. If today is Wednesday, next Thursday would not be in this week but in next week which would be eight days from today.