Related: <a href="http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;4608470&#x2F;why-dec-31-2010-returns-1-as-week-of-year" rel="nofollow">http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;4608470&#x2F;why-dec-31-2010-r...</a>