Clock Timer not converting to minutes correctly

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I changed them to if statements and cleaned it up a little and it works when counting up but not down. It goes from 2:00 to 2:-1 to 1:58.

Updated Code below:

                                                                                  // Begin Code for timing
                                                       if (sec1 == 59 && min1 >= 0) { // Resets seconds to 0 and increases minute when hitting 60s
                                                       min1 = min1 +1;
                                                       sec1 = 0; 
                                                       }
                                                       if (sec1 < 0 && min1 >= 1){ // Resets seconds to 59 and decreses minute when hitting 0s                                                
                                                       sec1 = 59;        
                                                       min1 = min1 - 1;                                        
                                                       }
                                                       if (dispcount <= 59){
                                                       sec1 = dispcount;
                                                       min1 = 0;                                                     
                                                       }
                                                       else {
                                                       sec1 = dispcount - (60*min1);} 

                                                       // End Code for Timing