I found a millisecond approach a while back that hasn't given us any issues

yet

604800000 milliseconds in a week is the fact I base the code on.

var date:Date = new Date(YYYY, MM, DD);

Datetime lastyear = date.setMilliseconds(date.milliseconds - 604800000 * 52);

On Tue, May 8, 2018 at 8:07 AM, Richard Kaye <rkaye@invaluable.com> wrote:

> While doing my due diligence on the subject I thought I’d toss it out here

> in case someone already has a function handy that will do this, thus saving

> me the effort of thinking too hard too early in the day.