Last modified: 2009-08-27 17:27:32 UTC
When setting a date property to 1960/02/29 which is a valid date, we get the error "The date "1960/02/29" was not understood."
I cannot reproduce this problem. Please upgrade to the current version SMW 1.4.3 and check if the bug still occurs. I also created a test page: http://sandbox.semantic-mediawiki.org/wiki/Leap_year_test