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Perl, 99 81 75 51 40 36 29 bytes

sleep(print gmtime."\n");do$0

Perl, 99 81 75 51 40 36 29 27 bytes

sleep(print gmtime.$/);do$0

Perl, 99 81 75 51 40 36 bytes

sleep(print scalar gmtime,"\n");do$0

Perl, 99 81 75 51 40 36 29 bytes

sleep(print gmtime."\n");do$0

Perl, 99 81 75 51 40 bytes

while(sleep(print scalar gmtime,"\n")){}

sleep printf"%02d:%02d:%02d\n",(gmtime)[2,1,0];do$0

{($s,$n,$h)=localtime(time);printf"%02d:%02d:%02d\n",$h,$m,$s;sleep 1;redo}

while(1){my($s,$n,$h)=localtime(time);printf"%02d:%02d:%02d\n",$h,$m,$s;sleep(1)}

while(1){my($s,$n,$h,$x,$x,$x,$x,$x,$x)=localtime(time);printf"%02d:%02d:%02d\n",$h,$m,$s;sleep(1)}

Perl, 99 81 75 51 40 36 bytes

sleep(print scalar gmtime,"\n");do$0