in fact i have several clock timers running for this project , most are based on the master timer with other value settings to change the displayed results

for this task the time counter counts up from 0 , the set _time value is the length of time before trigging the overtime clock , which counts up to show the total amount of time exceeding the set_time values

when the main timer exceeds the set_time then a secondary timer ( overtime clock ) is enabled and then shows and continues to run until the main timer stops

as seen if the overtime clock values = main clock - set time , when a sec , min , hour roles over , a < 0 value will occur untill the time value = set_time value again