A year can have 52 or 53 weeks and it can begin with week nr 1, 52 or 53
check this algorithm
http://www.threesides.se/blogg/2010/04/15/date-calculation-algorithm/


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 Hans Åhlin
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2010/6/30 Lester Caine <les...@lsces.co.uk>:
> Michael Alaimo wrote:
>>
>> I have found a bug report.  This is the correct functionality.
>>
>> Mike
>>
>>> I understand that technically there are more than 52 weeks in a year.
>>> Well at least google says 1 year = 52.177457 weeks.
>>>
>>> So I run the command:
>>> php>  echo date('W' , mktime(0, 0, 0, 1, 1, date('Y')));
>>> 53
>>>
>>> As you can see the result is 53.
>>>
>>> Any thoughts on this?
>
> http://www.sdn.sap.com/irj/boc/index?rid=/library/uuid/1016ca2b-7f43-2b10-8199-a78d1bcc49e9&overridelayout=true
> Covers it nicely ...
>
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> Lester Caine - G8HFL
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