Easiest way to find GMT offsets where local time is between certain hours?
<p>If it's 2am in London, how can I find the GMT offsets in seconds where the local time is between 7am and 7pm?</p>

<p>I have database records with a GMT offset column (-3600, -14400, 28000 etc) . I'd like to be able to select by those with offsets falling roughly within local daytime hours. Right now, which of these offsets are in daytime hours? I'm totally at a loss for how to approach this. </p>
