calculate overtimehrs

Hi,
Here is scenario want ot calculate overtime hrs ,standard hrs
 
sunday         10:00:00
monday          8:00:00
tues                8:00:00
wed                  8:00:00
thurs               8:00:00
frii                 8:00:00
sat                  12:00:00
total              62:00:00 //below is the code for this
overtime & ...