RE: [PHP] What's with 2016-11-06

Thank you Richard for the explanation: > DST. On both 2015-11-01 and 2016-11-06 the US switched back to standard time. ..and thank you Shiplu for the DateTime suggestion. I used your suggestion to correct my program, but wanted to report a minor change needed in shiplu's example: $d1->add(new DateInterval('PD1')); // generated error 'Unknown or bad format (PD1)' $d1->add(new DateInterval('P1D')); // works -- Clifford R. Nieuwenhuis IT Manager Architectural Design Consultants, Inc. c.nieuwenhuis@adcidesign.com 608-254-6181   From: muquaddim@gmail.com [mailto:muquaddim@gmail.com] On Behalf Of shiplu Sent: Tuesday, October 25, 2016 9:18 AM To: Cliff Nieuwenhuis Cc: php-general@lists.php.net Subject: Re: [PHP] What's with 2016-11-06 If you want to traverse days between 2 dates, just use DateTime and DateInterval classess. $d1 = new DateTime('2016-10-30'); $d1->add(new DateInterval('PD1')); $d1 should point to next day now.        On Tue, Oct 25, 2016 at 4:10 PM, Cliff Nieuwenhuis <c.nieuwenhuis@adcidesign.com> wrote: This is a stripped-down version of a calendar program.  Can anyone explain why November 6 2016 appears twice? Or 2015-11-01? I'm assuming the fault lies with         $calday = $calday + (60 * 60 * 24); ..but I'd like to know why some days apparently have less than 86400 seconds and how (efficiently) to work around that. Here is my code:         $calday = strtotime('2016-10-30');         $finish = strtotime('2016-12-01');         while ( $calday < $finish ) {                 for ($dow = 0; $dow < 7; $dow++) {                         // set the year, month, and day                         $year = (int) date('Y', $calday);                         $month = (int) date('n', $calday);                         $day = (int) date('j', $calday);                         echo "Year: $year, Month: $month, Day: $day, Day of Week: $dow <br />\n";                         // move on to the next day                         $calday = $calday + (60 * 60 * 24);                 }                 echo "* * *<br />\n";         } Thanks in advance for any help. -- Clifford R. Nieuwenhuis IT Manager Architectural Design Consultants, Inc. c.nieuwenhuis@adcidesign.com 608-254-6181 -- Clifford R. Nieuwenhuis IT Manager Architectural Design Consultants, Inc. c.nieuwenhuis@adcidesign.com 608-254-6181 Visit our redesigned website: www.adcidesign.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- Shiplu.Mokadd.im Unix Hacker Innovation distinguishes between follower and leader —  Steve Jobs An expert is a person who has made all the mistakes that can be made in a very narrow field. — Neils Bohr