Official comment
Please try the following script. Starting_date will be the first Monday following the current date and ending_date is 2 days after that. Credit for the algorithm to find the closest Monday goes to the website: https://stackoverflow.com/questions/33078406/getting-the-date-of-next-monday
WEB VALUE_GET RESULT_VARIABLE date SOURCE JAVA_SCRIPT var curr_date = new Date(); // current date
var day_info = 8.64e+7; // milliseconds per day
var days_to_monday = 8 - curr_date.getDay(); // days left to closest Monday
var monday_in_sec = curr_date.getTime() + days_to_monday * day_info; // aleary Monday in seconds from 1970
var next_monday = new Date(monday_in_sec); // Monday in date object
next_monday.setHours(0,0,0);
return next_monday; EXCLUDECHARS HALT ON ERROR
VALUE_SET_DATE @date RESULT_VARIABLE starting_date OFFSET ESCAPE HALT ON ERROR
VALUE_SET_DATE @starting_date RESULT_VARIABLE ending_date OFFSET +2d ESCAPE HALT ON ERROR