[AbyssMorgan]

START: timecnt = 0, timestop = 300

every second:

PHP код:

timecnt++; // 1 2 3 4 ... 300
new timessek, timesmin;
timesmin = ((timestop-timecnt)/60);
timessek = (timestop-(timecnt+(timesmin*60)));
format(buffer,sizeof buffer,"%02d:%02d",timesmin,timessek);
//show time
if(timecnt == timestop){
    //The End
    timecnt = 0; //reset
} 


//edit: despite counting upwards, it shows the time down: 5:00 4:59 ... 0:00

Example:
https://www.youtube.com/watch?v=desa4vyIHGs
countup, time down