Hi Greg,

check out help on SET FDOW, SET FWEEK and WEEK(), those may help explain what you are seeing.

>>?WEEK(DATE(2007,12,29)) && returns 52 because is Saturday
>>
>>>?WEEK(DATE(2007,12,30)) && returns 1 because is Sunday
>>
>>It´s not a bug but a feature.
>
>But what dictates that 30-Dec-2007 is week 1 and not week 53 in year 2007? If you look at 30-Dec-2005, it returns week 53 (so it is possible to have more than 52 weeks in a year). Why not consider the last two days as week 53 for year 2007?