Reg : Default values and operators in search using get_dquery_definitions

Hi all.

I have one date field in search screen . My requirement is add couple of operators and default values based on Operators.

I know how to make enable standard operators for field in search . but here I need to define Custom operators  and values.

Example

field                            operator                    value

ZFLD0001(date)      1Year                         20/08/2013      to 20/08/2014

ZFLO0001               1month                       20/08/2013    to 20/09/2013

I need to populate the Custom operators, if user select the "1 year", the value will populated in screen.

I have tried using the get_dquery_definitions method in IMPL class.. but not able to resolve.,

Please help me this.

regards,

ajay