Specify whether the time is summer system

Specify whether the time is daylight saving
How to determine the specified time to obtain the use of US daylight saving system

I know I can write a function to determine whether the current U.S. daylight saving system ...

But look for a little bit not to say the time to judge ....


The judgment of Daylight saving system
function Is_dst () {
$timezone =date (' e '); Get the time zone that is currently in use
Date_default_timezone_set (' us/pacific-new '); Force set time Zone
$dst =date (' I '); Determine if daylight saving time
Date_default_timezone_set ($timezone); Restore Time Zone
return $DST; return results

}

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Is the second argument of date not the specified time?

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