qgis/QGIS — pull request #1524 by SrNetoChan (2014-07-30 21:49:20+00:00)
Title: Fixed Legacy date widget default format

I believe this will fix a papercut bug caused that happens when a older project with the date widget, is opened in 2.4 or Master. Since the default format used for old projects is yyyy-mm-dd (notice that "mm" is actually minutes) the target fields will show wrong values, and errors might occur when trying to save.

https://hub.qgis.org/issues/10988