Avoid 'Invalid date' warning. Based on patch by Wolfgang Rohdewald.
Avoid 'Invalid date' warning. Based on patch by Wolfgang Rohdewald.

svn path=/trunk/kdepim/; revision=256351

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi