Find user by the time of the day (timezone)
I am using Drupal and I changed the way the timezone field is used in the users table. It used to contain the number of seconds difference. For example when my timezone was EST (America/Montreal), then this field would have -18000 as the value.
-5 * 60 * 60 == -18000
Now, this field contains the actual timezone id (America/Montreal or EST). This is much more precise and support daylight savings.
I needed to find all users which their clock is 5AM in order to send them a daily newsletter. But those loving at the other side of the globe would have a different timezone and therefor would get their newsletter at 5PM their time if we sent the newsletter at 5AM Eastern time.
SELECT uid, name, timezone FROM users
@@session.time_zone contains the server's timezone for this session.
So I am converting the current time from the current timezone to the user's timezone and make sure it's 5 o'clock.
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