Find records using dropdown

[JMart]

Good day gurus,

 

I have a database with a field that contains a service date (formatted as e.g. June-20178), I also have a layout that shows the customer whose service is due on a particular month, I would like to be able to have a dropdown field to be able to find only the customer whose service is due on a particular month.  

 

Any guide and help is greatly appreciated.

[comment]

I don't understand your question. First, what kind of format is "June-20178"? Next, what exactly should this drop-down display for the user to select from?

 

Edited June 1, 2017 by comment