The 4POS backoffice date will stay on 2005 till you start doing your day-ends! The day-end allows you to specify for which date are you doing a day-end!
So, Do your cashup, & the do the dayend every day!
Remember 4POS assumes you are a hard worker & operate every day. So if your business is closed on Sundays, on a Monday it will have Sunday's date on the screen, simply click on Monday's date and continue!
On the same point - if you have done a day-end for the wrong date eg. 20th of April instead of 20 of March - simply go to Day-end - Day-end reports - click once on the incorrect date & press d for Date (Lower case) & change the date to the correct date!