Formatting in a datetime parameter

A strange one this. I have two data parameters, both of which have their default values set from a dataset.I've noticed in the datetime picker that if the time is 00:00:00 only the date is shown (dd/mm/yyyy) however if the time is not 00:00:00 then the format changes to dd/mm/yyyy hh:mmWhy is it doing this and secondly what can I do to force it to always be dd/mm/yyyy hh:mmJust to reinforce, this is the DateTime picker that needs formatting not formatting in the report.SQL Server 2012Thanks for any assistance.Giles