Validate day is a Monday?

Cycle : week
min: 1 01:01:01
max: 1 23:59:59

"Date range" and "Date range2" should have the same thing .
I have not test all the use case when i build "Date range2" ,
You could try with "Date range" .

the correct should be :
Cycle : week
min: 1 00:00:01
max: 1 23:59:59

Try with the latest code of dev version.
I have fixed it.
The correct code for week validate should be:

              $week_day = date('w', strtotime($date_str));
              $date_str = substr($date_str, 10);