I once ran a script on production to re-push some old data for a customer based on log entries. This script used the log timestamps to decide which data to re-p

I once ran a script on production to re-push some old data for a customer based on log entries. This script used the log timestamps to decide which data to re-push. Didn't realize that the timestamps in the log files were UTC, and I just ran it with the default timestamp provided by the library (which is the one the host system uses). Lucky for me, the system's default timezone was also UTC, but nonetheless, the moment I realized it and the 10 minutes it took me to read the documentation and to check the host system's timezone felt like hours. You live and you learn, I'd say :)