No need to ignore IsGregorianDate any more

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74650 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix indentation error

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74651 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix circular import

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74652 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775