Best way to do a query with timezone

Question

I have user from different timezone and I need to improve one of my query:

 WHERE DATE_ADD(pa.inspection_date, INTERVAL -39600 SECOND) >= Date( '2020-05-05')
     AND DATE_ADD(ai.inspection_completed_date, INTERVAL -39600 SECOND) <= DATE( 
           '2020-05-06') + INTERVAL 1 DAY 

Currently, this query is very slow ( 5 minutes) because I think the Date_add broke(ignore) my index on inspection_date field. If I remove Date_add I got 0.2 second result.

All my time on my database are in UTC. So I would like to know, how can I perform a mysql query with the user timezone and let's mysql keep my index.

User can choose the date they they want for my example, they choose the start and the end date

Answer 1

Try this way:

WHERE pa.inspection_date >= (DATE('2020-05-05') + INTERVAL 11 HOUR)
  AND ai.inspection_completed_date <= DATE('2020-05-06') + INTERVAL 35 HOUR 

And check if both columns pa.inspection_date and ai.inspection_completed_date are indexed.