Question

我正在编写一个API，它将从传感器中检索读数并返回一个时间和值的列表，使用Javascript的`new Date（） offset（见下面的原因）

我已经能够使用$date->sub(DateInterval::createFromDateString($offset . " minutes"))使时间加法/减法运行得足够好，但返回的时间和日期的偏移量为+00：00（例如2016-02-26T13:32:28+00:00而不是{澳大利亚{1}}。

这会导致像Pebble或AngularJS这样的问题，它们在看到偏移量为+00：00之后将自己的偏移应用于我自己的偏移量

如何在致电2016-02-26T13:32:28+11:00时正确设置偏移量？我应该自己编制日期（例如$date->format("c")）还是有更好的方法来完成它？
编辑：由于平台限制（例如Pebble智能手表），我不能或不想使用时区名称，因为在我的手表应用程序中实现时区菜单会破坏用户体验或驱动文件大小我向时区表/库
添加了一个偏移量

Answer 1

是这个吗？

$date = new DateTime('now', new DateTimeZone('Australia/Adelaide'));
var_dump($date);
var_dump($date->format('c'));

输出

object(DateTime)[2]
  public 'date' => string '2016-02-26 13:35:48.000000' (length=26)
  public 'timezone_type' => int 3
  public 'timezone' => string 'Australia/Adelaide' (length=18)
string '2016-02-26T13:35:48+10:30' (length=25)

Answer 2

我最后对此进行了分类。来自PHP manual的这一点信息让我感到惊讶：

当$ time参数是UNIX时间戳（例如@ 946684800）或指定时区（例如2010-01-28T15：00：00 + 02:00）时，将忽略$ timezone参数和当前时区。 / p>

所以我的最终解决方案是扩展DateTime类并覆盖__construct()方法。我修改过的课程如下：

<?php

  class timezone extends DateTime {

    // Override our __construct method
    function __construct($date = "now", $offset = null) {
      // If we've not specified an offset
      if(is_null($offset)) {
          // Assume UTC
          $offsetFormat = "+00:00";
          $offset = 0;
      // Otherwise..
      } else {
        // Create a new DateTime, and get the difference between that, and another new DateTime that has $offset minutes subtracted from it. Format the results as something like +11:00 or -03:00
        $offsetFormat = (new DateTime($date, new DateTimeZone("UTC")))->diff((new DateTime($date, new DateTimeZone("UTC")))->sub(DateInterval::createFromDateString($offset . " minutes")))->format("%R%H:%I");
      }

      // Next, we get the offset from our $date. If this offset (divided by 60, as we're working in minutes, not in seconds) does NOT equal our offset
      if((new DateTime($date))->getOffset() / 60 !== $offset) {
        // Overwrite $date, and set it to a new DateTime with $offset minutes subtracted from it
        $date = (new DateTime($date, new DateTimeZone("UTC")))->sub(DateInterval::createFromDateString($offset . " minutes"));
      // If $date's offset equals $offset
      } else {
        // An offset has already been applied (we know this because all our pre-offset dates will be in UTC), and we don't need to do it again
        $date = (new DateTime($date));
      }

      // Finally, hand this back to the original DateTime class. This format works out to be something like: 2016-03-10T23:16:37+11:00
      parent::__construct($date->format("Y-m-d\TH:i:s") . $offsetFormat, null);
    }

  }


  echo (new timezone())->format("c") . "<br />"; // Will output something like 2016-03-10T12:17:44+00:00
  echo (new timezone(null, -660))->format("c") . "<br />"; // Will output something like 2016-03-10T23:17:44+11:00
  echo (new timezone("midnight", -660))->format("c") . "<br />"; // Will output 2016-03-10T11:00:00+11:00
  echo (new timezone("midnight"))->format("c") . "<br />"; // Will output 2016-03-10T00:00:00+00:00
  echo (new timezone("2016-01-01T00:00+00:00", -660))->format("c") . "<br />"; // Will output 2016-01-01T11:00:00+11:00
  echo (new timezone("2016-01-01T00:00+11:00", -660))->format("c") . "<br />"; // Will output 2016-01-01T11:00:00+11:00. Note that the offset isn't applied twice!

 ?>

编辑：这是一个我开源的图书馆。 Check it out over on GitHub

在PHP中设置时区偏移量

2 个答案: