Bug #53148 [Com]: date_sunrise and date_sunset show tomorrow's times for some timezones.

Edit report at https://bugs.php.net/bug.php?id=53148&edit=1 ID: 53148 Comment by: gasparmdq at gmail dot com Reported by: sec at mboca dot com Summary: date_sunrise and date_sunset show tomorrow's times for some timezones. Status: No Feedback Type: Bug Package: Date/time related Operating System: linux and windows PHP Version: 5.2.14 and 5.3.3 Assigned To: cmb Block user comment: N Private report: N New Comment: The same problem happens on PHP7.3 A snippet of code that shows the issue could be: <?php $dateTime = new DateTime('2013-10-01T10:35:00.000+13:00'); $timestamp = $dateTime->getTimestamp(); $sunInfo = date_sun_info($timestamp, -37.6908, 177.25); $sunInfo_2 = date_sun_info($timestamp, -37.6908, 177.50); echo $timestamp."<br>"; echo "Sunrise for longitude 177.25: ".$sunInfo['sunrise']."<br>"; echo "Sunrise for longitude 177.50: ".$sunInfo_2['sunrise']."<br>"; ?> which outputs: 1380576900 Sunrise for longitude 177.25: 1380476829 Sunrise for longitude 177.50: 1380563169 The sunrise for long 177.25, when transformed a readable value is: GMT: Sunday, September 29, 2013 5:47:09 PM Your time zone: Monday, September 30, 2013 6:47:09 AM GMT+13:00 DST The sunrise for long 177.50, becomes: GMT: Monday, September 30, 2013 5:46:09 PM Your time zone: Tuesday, October 1, 2013 6:46:09 AM GMT+13:00 DST As you can notice, the seed timestamp for both is the same, the only difference is the longitude value. But we still get results for the next day. This was reproduced using the latest PHP7.3 docker image (using alpine linux), also can be reproduced copying the provided code on http://phpfiddle.org/ (I don't know what environment they use). This also happened on our old PHP5.6 servers using CentOS so it looks like is not OS/PHP version dependent, but an actual bug on the code. Shall the behaviour exposed were intended, I would appreciate some sort of explanation regarding the why is expected. Previous Comments: ------------------------------------------------------------------------ [2018-06-24 04:22:27] php-bugs at lists dot php dot net No feedback was provided. The bug is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so and change the status of the bug back to "Re-Opened". Thank you. ------------------------------------------------------------------------ [2018-02-12 18:01:55] cmb@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with , is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2013-10-28 22:14:00] phpnet at stanton dot co dot nz PHP 5.3.15 Also has this issue though I don't believe it is related to the timezone being +12 or over Keeping the timezone the same I changed the longitude value from 175 to 180 in 0.25 increments and found the sunrise/set values jump to the next day at different longitudes according to the time of the year. Checking for the sunrise time on Oct 1st 2013 10:35 (NZ summer time) at longitude 177.25 gets 2013-10-01T06:45:18+13:00 but shift the longitude to 177.5 at the sunrise is reported as 2013-10-02T06:44:18+13:00 Checking for the sunrise time on Oct 31st 2013 10:35 (NZ standard time) at longitude 175.75 gets 2013-10-31T06:09:32+13:00 but shift the longitude to 176 at the sunrise is reported as 2013-11-01T06:08:32+13:00 ------------------------------------------------------------------------ [2010-10-31 10:32:15] sec at mboca dot com I figured out a workaround to this bug. you have to add -1 day to subtract one day from sunrise and sunset times. if ($offset >= 12 && strcmp(date_default_timezone_get(), "Pacific/Tarawa") != 0) { echo "+12 GMT workaround done<br>"; $sunrise = strtotime('-1 day', $sunrise); $sunset = strtotime('-1 day', $sunset); $csunrise = strtotime('-1 day', $csunrise); $csunset = strtotime('-1 day', $csunset); $nsunrise = strtotime('-1 day', $nsunrise); $nsunset = strtotime('-1 day', $nsunset); $asunrise = strtotime('-1 day', $asunrise); $asunset = strtotime('-1 day', $asunset); } I need to test on time zones that are -12 in offsets might have to do +1 day on that offset. ------------------------------------------------------------------------ [2010-10-28 06:33:38] sec at mboca dot com It happens on php 5.3.3 too. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. 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