You need to fix it in the game.db with an sql tool.
Navigate there to the dw_settings and look if there is a serverruntime entry (most likely not)
So add a new column and name it serverruntime and add the value 3677564.48736522 this sets your day to 1 and it will then continue to count up.
Can find a more in depth explanation here: Funcom forums - day 0 - decay reset fix