Convert Julian dates to Normal date in IDT

Hi,

i have julian dates in my database and when i was using the universe design i was using this function

dateadd(dd,convert(numeric,right(Date,3))-1,convert(datetime,'1/1/'+left(Date+1900000,4))) , but now when i make a universe with multiple data source it's not working , so what's the function that i can use it instead of this function?

Regards,