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Detect Daylight Saving Time on a MySQL server in the America/New_York timezone. (See related posts)

SELECT -5 - CAST(REPLACE(TIMEDIFF(NOW(), UTC_TIMESTAMP()), ':00:00', '') AS SIGNED) AS isDst

To test in other timezones, replace -5 with your local standard time GMT offset.
to mysql timezone dst by mrclay on Tue Jan 15 14:21:42 -0500 2008

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