How to use button to filter data

[#1]

Hi All,

I have the following records:

TestDate

2012-1-1 00:30:00

2012-1-3 10:00:00

2013-1-1 01:30:00

I want to use one button to show the data with Half hour, like the first record and the third record.

How to achieve it?

Thanks.

[#2]

PFA..........!