One of the happiest moments for me when starting at my current job was the day I saw that all our servers were set to UTC as the default time zone. Leap seconds

One of the happiest moments for me when starting at my current job was the day I saw that all our servers were set to UTC as the default time zone. Leap seconds may cause some pain every 3 years or so, but a huge number of problems in system time accounting can be avoided by just keeping everything in UTC, and translating into a given timezone representation only at the highest possible level, just before displaying information to end users.