Arduino millis() reset hack

#include "wiring.c"              // to enable our millis() reset hack

int sekunder = 0;
int last_sekunder = 0;
int minutter = 0;

void setup() {}

void loop{)

    if( millis()  >= 1000 ) {
        sekunder++;
        last_sekunder = millis();
    }

    if( millis() >= 60000 ) {
        minutter++;
        timer0_millis = 0;
        last_sekunder = 0;
    }
}