Reviving the legendary Nokia3310 LCD

I hardly understand what you did in this area... Can you put some comments on this part of code?

if((hour & 0x1F) >
= 0x13)
                     {
                       hour = hour & 0b11100001;
                       hour = hour ^ 0x20;
                       //pixelxy(54,5);
                       //wrdata(0x7C);wrdata(0x12);wrdata(0x7C);
                     }
                     else if((hour & 0x1F) <= 0x00)
                     {
                       hour =  hour | 0b00010010;
                       hour = hour ^ 0x20;
                       //pixelxy(54,5);
                       //wrdata(0x7E);wrdata(0x12);wrdata(0x0C);
                     }

i was trying to make it 12hr format...