How to short the datetime while choosing the dropdownlist

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VB

Windows

MS-Access

application

Dear Friends

I want the source code for how to short the datetime while selecting the dorpdownlist but the dropdownlist contains the string like as a above 30days, above 60days, above 90days,above 120days from the currect datetime

if the user select the above 30days from the dropdownlist and click on the search button it will show the blood given date before 30days from the current date values

Please any one of them give me the idea and sample source code for that


For Example

If the user click the above 30days from the dropdownlist and click on the search button, it will show the all blood_given_date is 14.07.2013 data into datagridview



Thanks / Regards
S.Pattu