Eddy's 1 line of .js to put in rules tab solved the question posted by Sera about date-picker on date filters, so yes, I'd say this thread was 'solved'.

You are asking about something different, one among numerous pre-defined date functions that Dynamic AI allows you to use in fixed conditions or as defaults for date filters.

You'll notice that there are two previous week functions: one is previous work week. One starts with Monday, the other starts with Sunday.

If you can't find a predefined default to your liking you can easily roll your own using SQL DatePart command.