kakoni edited a comment on issue #5182: Changed of Date to epoch time in Table view - Superset - 0.25.6 URL: https://github.com/apache/incubator-superset/issues/5182#issuecomment-448987703 Still present in 0.29. It is caused by this commit https://github.com/apache/incubator-superset/commit/0ec9cd4ad279c24b6d65fb825a319357958297fd Basically datetime date field gets formatted by BaseViz.json_dumps that uses json_int_dttm_ser serializer which turns date into epoch. @mistercrunch I guess that commit fixed non grouped options, but in turn broke grouped. What happens if one would only do ```python def json_dumps(self, obj, sort_keys=False): return json.dumps( obj, default=utils.json_iso_dttm_ser, sort_keys=sort_keys, ignore_nan=True ) ``` in tableviz ?
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