[BUG] get_spans start and end times are in user timezones whereas in phoenix the filtering is done in UTC

[gabe0912]

start_time and end_time filter on get_spans() transforms to iso_time which is in the user's timezone. The Phoenix UI also shows it on the users timezone, however, the filtering uses UTC by the looks of it.

[axiomofjoy]

@gabe0912 I assume we're talking about the get_spans_dataframe method on phoenix.Client?

[gabe0912]

@axiomofjoy https://github.com/Arize-ai/phoenix/blob/main/src/phoenix/session/client.py#L63 would be the root