how to set IN and OUT

Question

how to set Which is Intime and which is outtime from fingerprint device

I have 2 finger print device ,in that 2 finger print device im punching intime and outtime

     

 

        Device 1     ==>intime and outtime

        Device 2    ==>intime and outtime

 

im storing both 2 devices intime and outtime a table

        

intime	outtime
04-01-17 08:12:45	04-01-17 18:12:45
04-02-17 08:12:45	04-02-17 18:12:45
04-03-17 08:12:45	04-03-17 18:12:45
04-04-17 08:12:45	04-04-17 18:12:45

 

how to find which is intime and which is outtime from that record