In our application we can compare charts of timeseries data that may originate in many different places in the world. If you want to compare e.g. two charts of

In our application we can compare charts of timeseries data that may originate in many different places in the world. If you want to compare e.g. two charts of temperature over a 24-hour period between two places, you want noon for both to be in the same place on the X-axis. So you want to use local time of both places. But if you only store UTC, you don't know local time. No need for tzinfo changes or travelling through time zones.