foreach $host ( keys %hash )
{
	foreach $batch ( keys %{$hash{$host}} )
	{
		foreach $run ( keys %{$hash{$host}{$batch}} )
		{
			
			#print $hash{$host}{$batch}{$run}{'duration'}, "\n";
			print $hash{$host}{$batch}{$run}{'start'}, "\n";  #How do I sort by this?
			#print $hash{$host}{$batch}{$run}{'end'}, "\n";
			
			foreach $job ( keys %{$hash{$host}{$batch}{$run}{'jobs'} )
			{
				print $hash{$host}{$batch}{$run}{'jobs'}{$job}{'start'}, "\n"; #How do I sort by this?
			}
		}
	}
}