NYCPHP Meetup

[Daniel Convissor]

Hi:

On Tue, Mar 02, 2004 at 08:42:51PM -0500, Christopher R. Merlo wrote:
> Have any of you had to display local time on a server that uses GMT?
> I'm searching around Google trying to figure out how best to calculate
> NY time.  I don't want to just subtract 6 from the hour, because then

Ahem, you mean 4 or 5 hours for NY time.

Here's some code I made up for this purpose, though I've trimmed out stuff
that I don't believe is relevant to general use, but haven't thought of 
the full ramifications of whether it's really needed or not for your 
needs...

    /**
     * Determines if a given date/time combination is either Standard or
     * Daylight time in the US Eastern Time Zone.
     *
     * @param   string   $Time          time to be evaluated
     *                                   (<kbd>YYYY-MM-DD HH:MM:SS</kbd>)
     *
     * @return  string   <samp>S</samp> if Eastern STANDARD Time.
     *                   <samp>D</samp> if Eastern DAYLIGHT Time.
     *                   <samp>U</samp> zone couldn't be set.
     */
    function getTimeType($Time) {

        $z = getenv('TZ');
        putenv('TZ=EST5EDT');

        $Sec = strtotime($Time);

        switch ( date('O', $Sec) ) {
            case '-0400':
                $Zone = 'D';
                break;
            case '-0500':
                $Zone = 'S';
                break;
            default:
                //  Try this instead.
                putenv('TZ=US/Eastern');

                switch ( date('O', $Sec) ) {
                    case '-0400':
                        $Zone = 'D';
                        break;
                    case '-0500':
                        $Zone = 'S';
                        break;
                    default:
                        $Zone = 'U';
                        $this->Probs[] = 'Could not set Time Zone';
                }
        }

        putenv("TZ=$z");

        return $Zone;
    }

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