Bug #72096 [Opn->Ver]: Swatch time value incorrect for dates before 1970

Edit report at https://bugs.php.net/bug.php?id=72096&edit=1 ID: 72096 Updated by: requinix@php.net Reported by: p987b at davewilliamsmedia dot com Summary: Swatch time value incorrect for dates before 1970 -Status: Open +Status: Verified Type: Bug Package: Date/time related Operating System: Windows PHP Version: 5.6.20 Block user comment: N Private report: N New Comment: Done some digging around. Yadda yadda yadda, the time is supposed to be calculated as floor(seconds past midnight in UTC+1 / 86.4). The ext/date code uses integer division, and with the negative numbers it explains the accidental rounding up. The official website <http://www.swatch.com/en_us/internet-time/> has the same bug, but it looks like they're running PHP so... Previous Comments: ------------------------------------------------------------------------ [2016-04-24 18:54:14] p987b at davewilliamsmedia dot com Description: ------------ For dates prior to 1970, (i.e. dates represented by a negative unix timestamp value), swatch values produced by the gmdate() function using format character 'B' are incorrectly rounded-up. They consequently differ from the values produced for identical times of day on dates after 1970, as these are correctly rounded-down. This problem occurs on PHP 5.3 as well as 5.6. Test script: --------------- for ($unix=1461283200;$unix<=1461369600;$unix+=8000) { echo "\n Time:".gmdate('Y-m-d H:i:s = B ',$unix); echo " Time:".gmdate('Y-m-d H:i:s = B ',$unix-2592000000); } Expected result: ---------------- I would expect the three-digit swatch time values produced for the 1934 date (right-hand column) to be identical to the swatch values produced for the 2016 date (left-hand column), for any given time of day. Actual result: -------------- Time:2016-04-22 00:00:00 = 041 Time:1934-03-04 00:00:00 = 041 Time:2016-04-22 02:13:20 = 134 Time:1934-03-04 02:13:20 = 135 Time:2016-04-22 04:26:40 = 226 Time:1934-03-04 04:26:40 = 227 Time:2016-04-22 06:40:00 = 319 Time:1934-03-04 06:40:00 = 320 Time:2016-04-22 08:53:20 = 412 Time:1934-03-04 08:53:20 = 413 Time:2016-04-22 11:06:40 = 504 Time:1934-03-04 11:06:40 = 505 Time:2016-04-22 13:20:00 = 597 Time:1934-03-04 13:20:00 = 598 Time:2016-04-22 15:33:20 = 689 Time:1934-03-04 15:33:20 = 690 Time:2016-04-22 17:46:40 = 782 Time:1934-03-04 17:46:40 = 783 Time:2016-04-22 20:00:00 = 875 Time:1934-03-04 20:00:00 = 875 Time:2016-04-22 22:13:20 = 967 Time:1934-03-04 22:13:20 = 968 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=72096&edit=1