PDT differs from PST. Conversion logic can get especially confusing if you've specified a date time, and then the laws surrounding day light savings time are ch

PDT differs from PST. Conversion logic can get especially confusing if you've specified a date time, and then the laws surrounding day light savings time are changed to occur on a different day. Using UTC is like using a unix timestamp, you don't have to worry about a lot of things like locales & local laws, when the date time was recorded vs when its being viewed & what laws might have changed in-between. For example the date/time that daylight savings takes effect was changed in 2007. If you're trying to compare old logs to an old AWS announcement, it could get confusing... whereas UTC should remain immune to changes in laws.