my $data_fix = "00";

while (<DATA>)
	{
	my($data1,$data2,$data3,$data4,$data5) = split(/:/);
	chomp($data5);
	$data5 = $data5 . $data_fix;
	$data_line = $data1 . ":" . $data2 . "00" . ":" . $data3 . ":" . $data4 . ":" . $data5 . "00" . "\n";
	print $data_line;
	}

__DATA__
o:200806050852:b7199767:b24211012077030:200902232359
o:201103251457:b6235734:b2421100997663:201204022359
o:201403101021:b8015840:b24211013181843:201404072359
o:201407291225:b8759124:b24211001018862:201408262359