-savings time is in effect). Since we can't tell from the timestamp, we
-always parse these as EST which is UTC-5. When daylight savings is in
-effect, they will be off by an hour.
+savings time is in effect) and one's location (for example, Arizona
+doesn't observe daylight savings time). It's not much more useful to
+be off by one hour than it is to be off by five hours, and since we
+can't determine the true offset from the timestamp, we always parse
+and store these as UTC.