When converting time zones with MySql you should use the method CONVERT_TZ so that it will automatically take into account DST ( Daylight savings time / שעון קיץ )

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SELECT CONVERT_TZ('2013-03-29 12:00','America/New_York','Asia/Jerusalem');

This will convert a date in New York to our local time.

If you do not use this method and just subtract 7 hours from the time, you will have errors when we switch to and from DST.