How to make generic StartTime and EndTime in GET Request?

Below is my Get request, here intervalEndTime and intervalStartTime is dynamic it keeps changing and response i get from server is #77#,  

[https://uat.haulplan.com/ABF/api/import/getLogs/?intervalEndTime=Fri,+19+May+2017+09:05:50+GMT&intervalStartTime=Fri,+19+May+2017+09:05:45+GMT&scenarioId=1410 HTTP/1.1]

I need to verify the server response as #77#, but intervalEndTime and intervalStartTime is not an constant 

Please help me here