Convert number to date

[referee]

hi

in a list a have 2 fields

weeknumber and daynumber

something like ;
column 1 :836 = weeknumer (year-week)
column 2 :3 = daynumber

this numbers to same is like date : 3/9/2008

Is there a way or code to make a calculated field that convert the numbers to a date ?

i hope someone can help me

thank

[Andreas Kviby]

Why have you stored the year and weeknumber in that manner? If I understand your request you want to add a calculated field which in some way should ccreate a valid date from year 2008, week 36 and day 3 in that week?