php strtotime time zone problem, in some years the UTC time zone and the PRC time zone differ by 9 hours-PHP Chinese Network Q&A

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php strtotime time zone problem, in some years the UTC time zone and the PRC time zone differ by 9 hours

刘强 2019-01-29 10:33:31

1433

$timeStr='1987-5-4'; echo '测试时间：'.$timeStr; echo PHP_EOL; $prcTime=strtotime($timeStr); echo 'PRC时间:'; echo $prcTime; echo PHP_EOL; date_default_timezone_set('UTC'); $utcTime=strtotime($timeStr); echo 'UTC时间：'; echo $utcTime; echo PHP_EOL; echo 'UTC与PRC时间相差：'.(($utcTime-$prcTime)/3600).'小时'; echo PHP_EOL;

Result:

Test time: 1987-5-4

PRC time:547052400

UTC time: 547084800

UTC and PRC time Difference: 9 hours

After testing, the difference between UTC and PRC time for dates from 1987 to 1991 is 9 hours.

The php version is

PHP 7.1.9 (cli) (built: Aug 30 2017 18:34:46) (ZTS MSVC14 (Visual C 2015) x64)

刘强

reply all (1)

刘强2019-01-29 10:34:30 1 floor

Forgot to ask the question, what is the reason for this? How to deal with this bug?

Like+0

Add Reply

reply We are in the East Eighth District, and the PHP time starts from District 0, so there will be a difference of eight hours (PS: I didn’t learn geography well in junior high school). The solution: 1. Modify PHP configuration file 2. Use date_default_timezone_set

jesse author 2019-01-29 13:13:39

reply Well, there is a difference of 8 hours, but here is the difference between PRC East Eighth District and UTC, which is 9 hours, and it is only part of the year (1987-1991).

刘强 author 2019-01-31 08:54:36

reply I also encountered this problem two days ago, and after discussing it in the group, I roughly concluded that it was caused by daylight saving time.

唐润 author 2020-01-20 09:33:17