[zope2-tracker] [Bug 727981] [NEW] Browse DateIndex Broken for edge cases, displays wrong date

[Elizabeth Leddy]

Public bug reported:

Running 2.3.15
Test date: 2011-01-01
Part 1: Dates that are in the first month of the year (e.g. 2011-01-01) make the browse index page break because the modulo returns 0, which is then fed to DateTime and barfs. 
Part 2: The year is incorrect for the same test date. I see the logic in how its being calculated and I think that this is a precision error, although I didn't spend a lot of time investigating and there is some dubiousness. I tested with a wide range though and the patch seems at least more correct than the current display value.

Patch for both issues will be attached

** Affects: zope2
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/727981

Title:
  Browse DateIndex Broken for edge cases, displays wrong date