PHP中的UTC偏移量

Question

相对于当前(系统)时区,在PHP中获取UTC偏移量的最简单方法是什么？

Answer 1

  date('Z');

以秒为单位返回UTC偏移量.

Answer 2

// will output something like +02:00 or -04:00
echo date('P');

Answer 3

timezone_offset_get()

$this_tz_str = date_default_timezone_get();
$this_tz = new DateTimeZone($this_tz_str);
$now = new DateTime("now", $this_tz);
$offset = $this_tz->getOffset($now);

未经测试,但应该工作

Answer 4

我对奥斯卡所做的略有修改.

date_default_timezone_set('America/New_York');
$utc_offset =  date('Z') / 3600;

这给了我从时区EST到UTC的偏差,以小时为单位.

$ utc_offset的值为-4.

Answer 5

这是相同的 JavaScriptdate.getTimezoneOffset()函数：

<?php
echo date('Z')/-60;
?>

Answer 6

只需执行以下操作即可：

//Object oriented style
function getUTCOffset_OOP($timezone)
{
    $current   = timezone_open($timezone);
    $utcTime  = new \DateTime('now', new \DateTimeZone('UTC'));
    $offsetInSecs =  $current->getOffset($utcTime);
    $hoursAndSec = gmdate('H:i', abs($offsetInSecs));
    return stripos($offsetInSecs, '-') === false ? "+{$hoursAndSec}" : "-{$hoursAndSec}";
}

//Procedural style
function getUTCOffset($timezone)
{
    $current   = timezone_open($timezone);
    $utcTime  = new \DateTime('now', new \DateTimeZone('UTC'));
    $offsetInSecs =  timezone_offset_get( $current, $utcTime);
    $hoursAndSec = gmdate('H:i', abs($offsetInSecs));
    return stripos($offsetInSecs, '-') === false ? "+{$hoursAndSec}" : "-{$hoursAndSec}";
}


$timezone = 'America/Mexico_City';

echo "Procedural style<br>";
echo getUTCOffset($timezone); //-06:00
echo "<br>";
echo "(UTC " . getUTCOffset($timezone) . ") " . $timezone; // (UTC -06:00) America/Mexico_City
echo "<br>--------------<br>";
echo "Object oriented style<br>";
echo getUTCOffset_OOP($timezone); //-06:00
echo "<br>";
echo "(UTC " . getUTCOffset_OOP($timezone) . ") " . $timezone; // (UTC -06:00) America/Mexico_City