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    <p>The ISO calendar has a range of confusing rules that are likely the source of the issues you face here. In particular, the .NET implementation of <code>GetWeekOfYear</code> (with the parameters you have used) is so similar to ISO that <a href="http://blogs.msdn.com/b/shawnste/archive/2006/01/24/iso-8601-week-of-year-format-in-microsoft-net.aspx" rel="nofollow noreferrer">explicit clarifications</a> are required and linked from <a href="http://msdn.microsoft.com/en-us/library/system.globalization.calendarweekrule.aspx" rel="nofollow noreferrer">MSDN</a>. The result is that <code>isocalendar</code> and <code>GetWeekOfYear</code> will produce results that differ [my emphasis]:</p> <blockquote> <p>Specifically ISO 8601 always has 7 day weeks. If the first partial week of a year doesn't contain Thursday, then it is counted as the last week of the previous year. Likewise, <strong>if the last week of the previous year doesn't contain Thursday then its treated like the first week of the next year</strong>. GetWeekOfYear() has the first behavior, but not the second.</p> </blockquote> <p>Some suggestions for correcting <code>GetWeekOfYear</code> are discussed at the link above and also at <a href="https://stackoverflow.com/questions/428957/is-net-giving-me-the-wrong-week-number-for-dec-29th-2008">Is .NET giving me the wrong week number for Dec. 29th 2008?</a> If you actually want to match the <code>GetWeekOfYear</code> behaviour these two links will assist, although you will be applying the reverse transformation to their examples.</p> <p>The most 'Pythonic' way of doing it is to create a function. Nothing particularly special here, except the usual attempt to minimise code by doing things like <code>day &lt; 4</code> rather than <code>day == 1 or day == 2 ...</code> etc.</p> <p>(Of course, all of this is assuming that Python's <code>isocalendar</code> correctly matches the ISO calendar. The documentation seems to suggest that it does, where the <code>GetWeekOfYear</code> explicitly states that it doesn't, so it would seem a reasonable assumption. However, if this is a critical calculation, you will be testing it thoroughly yourself anyway.)</p>
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    1. COThat's what I thought. I thought I may have missed something in the calendar documentation. I'll write a function to implement this.
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