search: Fix search on create date

This addresses the issue where the advanced search dialog was submitted
before the date picker inputs were fixed up. This problem arises out of a
difference between the agent's date formatting preference and the server
being able to process that date format. The date pickers are reformated to
yyyy-mm-dd before submission; however, for advanced search, the submission
happened before the inputs were fixed up.

This patch addresses the issue by manually fixing up the date in the
submission routine for the advanced search dialog.