Joined: 06 Jun 2008 Posts: 8188 Location: East Dubuque, Illinois, USA
Does the SYNCSORT manual tell you that you can subtract a year from a date? If so, use what the manual recommends. If you cannot find it in the manual, contact the vendor to determine whether or not what you want to do is even possible, and if so how to do it. If your site is licensed for the product, you have access to the documentation and vendor support.