Group by Custom Date for a 2-Week Period

Hi,

We use the custom date field of 'Publish Date' to indicate when content needs to be published to our intranet. I'd like to create a report that shows what content is being published every two weeks from a Tuesday to a Tuesday.

Standard mode allows me to add a grouping based on the custom field for every 1 week, and I've been trying to use text mode to update it to be two weeks from a Tuesday. Any ideas?

textmode=true

group.0.groupdatesby=WY

group.0.valueformat=atDateAsWeekString

group.0.notime=false