Others may make arguments for benchmarks regarding various points above.

... don't print the converted time to console, just the unix time. If someone really wants read the log they can do the conversion themselves. -- bulk88

Not converting the time would be good enough if there won't be further use of the log. Otherwise, that places a high cost on the person reading to do the time conversions to be able to find the relevant entries. And, have a damn functioning log.