Calculate Timings For a Day

I have five columns. Column A with Serial Number, Column B with Date, Column C with Time, Column D with Entry Details, Column E with Name. Need to calculate difference of IN and Out for every day. Having 40 thousand data like this in a sheet with different date ? How can we calculate ? Sample data as below for reference.

S.No | Date | Time | Entry |Name
1 4-Aug-14 0:36 OUT anil
2 4-Aug-14 0:47 IN anil
3 4-Aug-14 1:59 OUT vinoth
4 4-Aug-14 2:01 IN vinoth
5 4-Aug-14 2:26 OUT sharma
6 4-Aug-14 2:28 OUT Ram
7 4-Aug-14 2:31 IN Ram
8 4-Aug-14 2:32 OUT jai
9 4-Aug-14 2:41 IN sharma
10 5-Aug-14 0:36 OUT anil
11 5-Aug-14 0:47 IN anil
12 5-Aug-14 1:59 OUT vinoth
13 5-Aug-14 2:01 IN vinoth
14 5-Aug-14 2:26 OUT sharma
15 5-Aug-14 2:28 OUT Ram
16 5-Aug-14 2:31 IN Ram
17 5-Aug-14 2:32 OUT jai
18 5-Aug-14 2:41 IN sharma

thanks for your reply, in and out timings will be in different rows for the same name and same date , multiple in and out also possible in a date. how to proceed?

solution ???? from anyone plz