This date is used by Subsail to switch the start issue for your “flexi-start” products. This is great when you want to create one product that you can continue selling as new issues are released (the start issue will change automatically using this date).
Subsail uses this date to charge all subscribers who renew with this issue. So, if you’re setting the recurring charge date for issue 5, this is a date around issue 5’s release date that you want to make charges on (for people who have bought up to issue 4).Most publishers push the charge date a few weeks prior to release date so that subscriber orders are made in advance and can be sent out as soon as they’re printed.