void print_time_to_lcd(void)
{
        char day[16];
        char clock[16];
        uint8_t minutes;

        // returns day and time-string in seperate variables:
        minutes=gmtime(time+(int32_t)-360*(int32_t)hours_offset_to_utc,day,clock);<<<<<<<<<<----------- TU
        if (prev_minutes!=minutes){
                // update complete display including day
                lcd_clrscr();
                lcd_gotoxy(0,1);
                lcd_puts(day);
                // update complete display
        }
        // write first line
        lcd_gotoxy(0,0);
        lcd_puts(clock);
        lcd_puts_P(" (");
        if (hours_offset_to_utc>=0){
                lcd_puts_P("+");
        }
        itoa(hours_offset_to_utc,gStrbuf,10);
        adddotifneeded(gStrbuf);
        lcd_puts(gStrbuf);
        lcd_puts_P(")");
        // write to first line
        lcd_gotoxy(15,0);
        lcd_putc(lindicator);
        prev_minutes=minutes;
        // before every hour
        if (minutes==57 && update_at_58_avoid_duplicates==0){
                client_gw_arp_refresh();  // causes a refresh arp for the GW mac
                update_at_58_avoid_duplicates=1;
        }
        if (minutes==58 && update_at_58_avoid_duplicates==1){
                // mark that we will wait for new
                // ntp update
                haveNTPanswer=2;
                send_ntp_req_from_idle_loop=1;
                update_at_58_avoid_duplicates=2;
        }
        // we need this update_at_58_avoid_duplicates variable
        // otherwise we will send every second an arp or ntp request
        // in that minute
        if (minutes<56){
                update_at_58_avoid_duplicates=0;
        }
}

minutes=gmtime(time+(int32_t)-360*(int32_t)hours_offset_to_utc,day,clock);

uint8_t gmtime(const uint32_t time,char *day, char *clock)
{
        char dstr[4];
        uint8_t i;
   uint32_t dayclock;
        uint16_t dayno;
   uint16_t tm_year = EPOCH_YR;
   uint8_t tm_sec,tm_min,tm_hour,tm_wday,tm_mon;

   dayclock = time % SECS_DAY;//godzin w danym dniu
   dayno = time / SECS_DAY;//dni

   tm_sec = dayclock % 60UL;//sekund w danym dniu
   tm_min = (dayclock % 3600UL) / 60;
   tm_hour = dayclock / 3600UL;
   tm_wday = (dayno + 4) % 7;   /* day 0 was a thursday */
   while (dayno >= YEARSIZE(tm_year)) {
      dayno -= YEARSIZE(tm_year);
      tm_year++;
   }
   tm_mon = 0;
   while (dayno >= monthlen(LEAPYEAR(tm_year),tm_mon)) {
      dayno -= monthlen(LEAPYEAR(tm_year),tm_mon);
      tm_mon++;
   }
        i=0;
        while (i<3){
                dstr[i]= pgm_read_byte(&(day_abbrev[tm_wday*3 + i]));
                i++;
        }
        dstr[3]='\0';
   sprintf_P(day,PSTR("%s %u-%02u-%02u"),dstr,tm_year,tm_mon+1,dayno + 1);
   sprintf_P(clock,PSTR("%02u:%02u:%02u"),tm_hour,tm_min,tm_sec);
        return(tm_min);
}