jQuery Grid Plugin - jqGrid

Hello.
Use trirand: jqGrid PHP.
Faced with a difficult problem:
Need to manage records the time and date, and in different time zones.
To implement decided to present time on the server as a UNIX time.
The user must see ( and use) in the format H:i d.m.Y.
Show turned out to be easy:
formatter:'date', formatoptions:{srcformat: ' U', newformat: ' H:i d.m.Y"}

BUT, you Must also add change (including Inline Editing) and search / sort (including Toolbar Searching on this parameter.

Reviewed the documentation've tried different ways
(edittype: ' custom and Events), but a complete solution is not found, Searching and / or Inline Editing is not working.

Please suggest a solution to THIS problem.
Or better to say how to change the value in a particular column when using Find and Change all types(Inline Toolbar).
The user should see and change the / to search for some data, and requests to change /add and search) must be sent the results of (modified user data).

PS. Used automatically transfer, but tried to formulate the questions in simple terms. Hope has turned clear.