Re: Time Zone Calculations

On 18/11/13 02:25, Ron Piggott wrote:

Hi Everyone

The result of the code below (Converting the time from GMT to Eastern , Then adding 561 Days and converting back to GMT) is giving me the result: 2013-11-18 14:32:00    I was expecting an hour earlier (2013-11-18 13:32:00)   Is there something I am doing wrong?

- I am trying to calculate 561 days in the future, but keeping the same time. - The reason I thought about converting from GMT to Eastern and back to GMT was because I wondered if Daylight Savings Time was the issue. Ron <?php $occurance_date = '2012-05-06 13:32:00'; $dt = new \DateTime( date('Y-m-d H:i:s' , strtotime( $occurance_date ) ) , new \DateTimeZone( 'GMT' ) ); $dt->setTimezone(new \DateTimeZone( "Canada/Eastern" )); $dt->modify('+561 days'); $dt->setTimezone(new \DateTimeZone( 'GMT' )); $revised_occurance_date = $dt->format('Y-m-d H:i:s'); ?> Ron Piggott www.TheVerseOfTheDay.info

Hi Ron, how exactly do add the number of days ? Do you use http://be.php.net/manual/en/datetime.add.php ? Changing from GMT to Eastern is the wrong option: DST does not apply to GMT - it applies to the offset between GMT and local time. I.e. CEST is GMT+1 in winter, and GMT+2 in summer. In fact, best to do is change from local time to GMT, then shift days, and come back to local time. Let me know if it works. Bert