Count number of weeks in which a given employee worked

Hi,

I have a spreadsheet (attached) with a list of Jobs with corresponding employee number as well as the date that the employee performed a particular job.

I need to know how many weeks that each employee performed work on five or more days in a given week. The number of jobs performed is not important for this analysis. Rather, we just need a list of ID numbers with a corresponding number of weeks where there were at least one job in five or more days that week.

Secondarily, there is a cut-off date (which will vary per employee) for which I need to ignore any jobs and/or weeks before that date.

I know how to use a pivot table to get a list of the unique ID numbers but the conditional count here is beyond my Excel abilities. Access may be able to do this easier but I am utterly without skill in that program.

Any ideas?

Thanks in advance.
2017-11-14-Sample-3--00324866xBDC2C.XLSX