Last modified: 2012-07-03 17:06:27 UTC
The tablesorter module could easily determine that "1 Apr 2012" is DMY order and "Apr 1 2012" is MDY order, but for some reason it doesn't. It just converts them to "1 4 2012" and "4 1 2012", respectively, and then assumes MDY or DMY order based on the global wiki configuration. Gerrit changeset coming shortly.
See Gerrit change #8042.
I've reverted your change to this bug title and severity, as it's clear you have misunderstood the bug. This is not a request to add support for a new format, it is to fix support that is intended to be there but is clearly very broken.
Thanks! I've just merged I8061b1a7892633e34be4d4a0273a4dd5045fd2ee into master.