When I connect to mysql for union queries with redash, the time fields of my tables A,B, and C are 2019-06-05, and the SQL outermost merge is 13-digit
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That’s missing a few details, for being able to solve this. 
Would you be ok to add?
- the SQL query that’s not working correctly
- what the result from it is, at the moment
- what you’re aiming for it to do instead