How can I run a SQL query to get the unique visitors in a certain time?

General questions
#1

Hi I just want to check how can I query this result on SQL?

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I checked on this link for the SQL query to select all visits and actions (during a certain time period)

And I tried COUNT(Distinct matomo_log_visit.idvisitor) but it has a different value from the matomo dashboard.

#2

Nevermind. I got this already. It is due to the timezone difference