Ok, well see a few variances betweek your setup and Qs kitchen display;
For one your using {DATE:} this cant be correct as that is system/current date/time… You need to use {ORDER TIME} surely?
Not fluent in tasks and task widget but if I had to guess I would say using {DATE} is always going to be 0-5 (AKA null) since DATE is current time not time of order.