Don't print timestamps to a buffer and then print the buffer.

Don't print timestamps to a buffer and then print the buffer.

Just directly print them.  This means:

	1) we don't have to worry about making a big enough buffer;

	2) we don't get annoying warnings about string truncation
	   due to invalid timestamp values;

	3) we use a constant string as a format, so that the compiler
	   can more easily do format string vs. format argument checks.