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Last week I fixed a bug in yahrzeit calculations in the hebcal website.
Calendrical Calculations

According to Calendrical Calculations by Edward M. Reingold and Nachum Dershowitz, the yarhzeit of someone who passed away in Adar of an ordinary year or Adar II of a leap year is also always in the last month of the year, be that Adar or Adar II.

The hebcal.com website previously displayed those anniversaries as occurring in Adar I. Hebcal for Unix 3.3beta10 also contains this fix.