And you've no doubt considered what to do in those cases in which Monday is a holiday and (iggerant) users simply run the job on their first workday of the week?

PS: Ratazong's suggestion implicitly offers an algorithm to avoid the problem above: Identify week number of current week and of the previous Monday... and if those are the same, adjust Monday_of_Week as required.

PPS: Christoforo's reply has a solution, too.