我正在使用具有PHP cURL的第三方REST API，我从中获取日期字段的格式为（即2019-03-09T08：00：00Z）的日期字段，该格式在浏览器的默认时区中。 我想编辑此日期，然后将其以UTC格式放回第三方服务器。
将其放置到服务器后，第三方GUI会显示我的日期更改为我的用户默认时区，即“美国/纽约”。
我编写了一个功能，该功能在大多数时间都有效，但跨越Spring-Forward和Fall-Back日期除外。 为了进行测试，我使用了以下2019年的SpringForward和Fall-Back日期。
官方时间更改为2019年3月10日-夏令时开始 即将达到当地标准时间 2019年3月10日星期日，凌晨2:00:00时钟向前调整1小时 而不是当地夏令时2019年3月10日星期日3:00:00
官方时间更改将于2019年11月3日-夏令时结束 当当地夏令时快到了 2019年11月3日（星期日）凌晨2:00:00将时钟向后调1小时 改为当地标准时间2019年11月3日（星期日）1:00:00。
问题：
任何人都可以让我知道我在做什么错吗？
测试PHP代码
// Create some dates that cross the Spring-Forward that occurred March 10, 2019 at 2:00 AM
$date_1a = "2019-03-09T01:59:59Z";
$date_1b = "2019-03-10T02:00:00Z";
$date_1c = "2019-03-10T06:59:59Z";
$date_1d = "2019-03-10T07:00:00Z";
// Create some dates that cross the Fall-Back that will occur on November 3, 2019 at 2:00 AM
$date_2a = "2019-11-03T01:59:59Z";
$date_2b = "2019-11-03T02:00:00Z";
$date_2c = "2019-11-03T05:59:59Z";
$date_2d = "2019-11-04T06:00:00Z";
// Display the original date retrieved from GET
echo 'Original Date 1a = ' . $date_1a . '<br/>';
echo 'Original Date 1b = ' . $date_1b . ' - Change not happening at 2:00 AM' . '<br/>';
echo 'Original Date 1c = ' . $date_1c . '<br/>';
echo 'Original Date 1d = ' . $date_1d . ' - Change happens at 7:00 AM not 2:00 AM' . '<br/>';
echo 'Original Date 2a = ' . $date_2a . '<br/>';
echo 'Original Date 2b = ' . $date_2b . ' - Change not happening at 2:00 AM' . '<br/>';
echo 'Original Date 2c = ' . $date_2c . '<br/>';
echo 'Original Date 2d = ' . $date_2d . ' - Change happens at 6:00 AM not 2:00 AM' . '<br/>';
// Get the timezone offsets based on the dates
$offset1a = get_timezone_offset($date_1a, 'UTC','America/New_York');
$offset1b = get_timezone_offset($date_1b, 'UTC','America/New_York');
$offset1c = get_timezone_offset($date_1c, 'UTC','America/New_York');
$offset1d = get_timezone_offset($date_1d, 'UTC','America/New_York');
$offset2a = get_timezone_offset($date_2a, 'UTC','America/New_York');
$offset2b = get_timezone_offset($date_2b, 'UTC','America/New_York');
$offset2c = get_timezone_offset($date_2c, 'UTC','America/New_York');
$offset2d = get_timezone_offset($date_2d, 'UTC','America/New_York');
// Display the Offsets in seconds
echo 'Date 1a offset in seconds = ' . $offset1a . ' - 01:59:59 AM' . '<br/>';
echo 'Date 1b offset in seconds = ' . $offset1b . ' - Change not happening at 2:00 AM should be -14400' . '<br/>';
echo 'Date 1c offset in seconds = ' . $offset1c . ' - 06:59:59 AM' . '<br/>';
echo 'Date 1d offset in seconds = ' . $offset1d . ' - Change happens at 7:00 AM not 2:00 AM' . '<br/>';
echo 'Date 2a offset in seconds = ' . $offset2a . ' - 01:59:59 AM' . '<br/>';
echo 'Date 2b offset in seconds = ' . $offset2b . ' - Change not happening at 2:00 AM should be -18000' . '<br/>';
echo 'Date 2c offset in seconds = ' . $offset2c . ' - 05:59:59 AM' . '<br/>';
echo 'Date 2d offset in seconds = ' . $offset2d . ' - Change happens at 6:00 AM not 2:00 AM' . '<br/>';
// Convert Adjusted Dates to seconds
$time1a = strtotime($date_1a)-$offset1a;
$time1b = strtotime($date_1b)-$offset1b;
$time1c = strtotime($date_1c)-$offset1c;
$time1d = strtotime($date_1d)-$offset1d;
$time2a = strtotime($date_2a)-$offset2a;
$time2b = strtotime($date_2b)-$offset2b;
$time2c = strtotime($date_2c)-$offset2c;
$time2d = strtotime($date_2d)-$offset2d;
// Create New Date Objects
$dt1a = new DateTime("@$time1a");
$dt1b = new DateTime("@$time1b");
$dt1c = new DateTime("@$time1c");
$dt1d = new DateTime("@$time1d");
$dt2a = new DateTime("@$time2a");
$dt2b = new DateTime("@$time2b");
$dt2c = new DateTime("@$time2c");
$dt2d = new DateTime("@$time2d");
// Format new date objects to UTC for PUT.
$adjustedDate1a = $dt1a->format('Y-m-d\TH:i:s\Z');
$adjustedDate1b = $dt1b->format('Y-m-d\TH:i:s\Z');
$adjustedDate1c = $dt1c->format('Y-m-d\TH:i:s\Z');
$adjustedDate1d = $dt1d->format('Y-m-d\TH:i:s\Z');
$adjustedDate2a = $dt2a->format('Y-m-d\TH:i:s\Z');
$adjustedDate2b = $dt2b->format('Y-m-d\TH:i:s\Z');
$adjustedDate2c = $dt2c->format('Y-m-d\TH:i:s\Z');
$adjustedDate2d = $dt2d->format('Y-m-d\TH:i:s\Z');
// Display new Date Objects to be PUT
echo 'Adjusted Date 1a = ' . $adjustedDate1a . '<br/>';
echo 'Adjusted Date 1b = ' . $adjustedDate1b . '<br/>';
echo 'Adjusted Date 1c = ' . $adjustedDate1c . '<br/>';
echo 'Adjusted Date 1d = ' . $adjustedDate1d . '<br/>';
echo 'Adjusted Date 2a = ' . $adjustedDate2a . '<br/>';
echo 'Adjusted Date 2b = ' . $adjustedDate2b . '<br/>';
echo 'Adjusted Date 2c = ' . $adjustedDate2c . '<br/>';
echo 'Adjusted Date 2d = ' . $adjustedDate2d . '<br/>';
// This function returns the timezone offset.
function get_timezone_offset($targetDate, $remote_tz, $origin_tz) {
$origin_dtz = new DateTimeZone($origin_tz);
$remote_dtz = new DateTimeZone($remote_tz);
$origin_dt = new DateTime($targetDate, $origin_dtz);
$remote_dt = new DateTime($targetDate, $remote_dtz);
$offset = $origin_dtz->getOffset($origin_dt) - $remote_dtz->getOffset($remote_dt);
return $offset;
}
?>
脚本输出
Original Date 1a = 2019-03-09T01:59:59Z
Original Date 1b = 2019-03-10T02:00:00Z - Change not happening at 2:00 AM
Original Date 1c = 2019-03-10T06:59:59Z
Original Date 1d = 2019-03-10T07:00:00Z - Change happens at 7:00 AM not 2:00 AM
Original Date 2a = 2019-11-03T01:59:59Z
Original Date 2b = 2019-11-03T02:00:00Z - Change not happening at 2:00 AM
Original Date 2c = 2019-11-03T05:59:59Z
Original Date 2d = 2019-11-04T06:00:00Z - Change happens at 6:00 AM not 2:00 AM
Date 1a offset in seconds = -18000 - 01:59:59 AM
Date 1b offset in seconds = -18000 - Change not happening at 2:00 AM should be -14400
Date 1c offset in seconds = -18000 - 06:59:59 AM
Date 1d offset in seconds = -14400 - Change happens at 7:00 AM not 2:00 AM
Date 2a offset in seconds = -14400 - 01:59:59 AM
Date 2b offset in seconds = -14400 - Change not happening at 2:00 AM should be -18000
Date 2c offset in seconds = -14400 - 05:59:59 AM
Date 2d offset in seconds = -18000 - Change happens at 6:00 AM not 2:00 AM
Adjusted Date 1a = 2019-03-09T06:59:59Z
Adjusted Date 1b = 2019-03-10T07:00:00Z
Adjusted Date 1c = 2019-03-10T11:59:59Z
Adjusted Date 1d = 2019-03-10T11:00:00Z
Adjusted Date 2a = 2019-11-03T05:59:59Z
Adjusted Date 2b = 2019-11-03T06:00:00Z
Adjusted Date 2c = 2019-11-03T09:59:59Z
Adjusted Date 2d = 2019-11-04T11:00:00Z
答案 0 :(得分：0)
您的期望不正确，因为：
Z表示UTC。更改发生在当地时间2:00 AM（em），而不是UTC 2:00 AM。
在夏令时开始时，America/New_York从01:59:59-05:00变为03:00:00-04:00
06:59:59Z到07:00:00Z的UTC中（您上午7点观察）在夏令时结束时，America/New_York从01:59:59-04:00变为01:00:00-05:00
05:59:59Z到06:00:00Z的UTC中（您上午6点观察）