Hello there,
Yes, when the timezone is available, all the timestamps in the payload come with the timezone offset at the end, like 2024-02-28T13:43:45+01:00 which is UTC+01. If the timezone is unknown to us or given by the data provider, the timezone will be given in UTC - so the best practice would be to detect the user's timezone in the frontend, convert the timestamp we provide (considering the offset) to their local timezone.
Hope that answers your question!