Github user cloud-fan commented on the issue: https://github.com/apache/spark/pull/19640 Since a spark cluster may be used by people from different timezones, I think at server side we should just store seconds from unix epoch(time epoch), which is comparable though different timezones. For the REST API, personally I think the server just need to send time epoch, but for ease of use, sending a timestamp string with GMT is acceptable. For the UI part, I think it's more reasonable to interpret the time epoch using browser's local timezone, but we don't need a config.
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