Dynamic date processing (next <time-of-day>)

[ghost]

"next " should return either the actual next or the one after depending on the current <-day-of-week>

Example:
Date is Tuesday the 12th:

• next Wednesday should be the 20th;
• next Thursday should be the 14th;
• next Friday should be the 15th

[rosastern]

Doubtful about resolution of next Wed as 20th from Tue 12th - this is notoriously ambiguous in natural language and the hard resolution should be Wed 13th