它是简单的JavaScript和PHP:

即使用户可以打乱他/她的内部时钟和/或时区，我迄今为止发现的最好的方法，以获得偏移量，仍然是新的Date(). gettimezoneoffset();。它是非侵入性的，不会让人头痛，也不需要依赖第三方。

假设我有一个表，users，其中包含一个字段date_created int(13)，用于存储Unix时间戳;

假设客户端创建了一个新帐户，数据是通过post接收的，我需要用客户端的Unix时间戳插入/更新date_created列，而不是服务器的。

由于在插入/更新时需要timezoneOffset，因此当客户端提交表单时，它作为额外的$_POST元素传递，从而消除了将其存储在会话和/或cookie中的需要，并且也没有额外的服务器访问。

var off = (-new Date().getTimezoneOffset()/60).toString();//note the '-' in front which makes it return positive for negative offsets and negative for positive offsets
var tzo = off == '0' ? 'GMT' : off.indexOf('-') > -1 ? 'GMT'+off : 'GMT+'+off;

假设服务器接收到tzo为$_POST['tzo'];

$ts = new DateTime('now', new DateTimeZone($_POST['tzo']);
$user_time = $ts->format("F j, Y, g:i a");//will return the users current time in readable format, regardless of whether date_default_timezone() is set or not.
$user_timestamp = strtotime($user_time);

插入/更新date_created = $ user_timestamp。

当检索date_created时，你可以像这样转换时间戳:

$date_created = // Get from the database
$created = date("F j, Y, g:i a",$date_created); // Return it to the user or whatever

现在，这个示例可能适合您的需要，当涉及插入第一个时间戳时……当涉及到额外的时间戳或表时，您可能需要考虑将tzo值插入到用户表中以供将来参考，或者将其设置为会话或cookie。

P.S.但是如果用户旅行并切换时区怎么办?在GMT+4登录，快速移动到GMT-1，然后再次登录。最后一次登录将在将来。

我认为……我们想得太多了。

试试下面的PHP代码:

<?php
    $ip = $_SERVER['REMOTE_ADDR'];
    $json = file_get_contents("http://api.easyjquery.com/ips/?ip=" . $ip . "&full=true");
    $json = json_decode($json,true);
    $timezone = $json['LocalTimeZone'];
?>

使用PHP日期函数，您将获得网站所在服务器的日期时间。获取用户时间的唯一方法是使用JavaScript。

但是我建议你，如果你的网站有注册要求，那么最好的方法是要求用户注册作为一个强制性的字段。您可以在注册页面中列出各种时区，并将其保存在数据库中。在此之后，如果用户登录到站点，那么您可以根据用户选择的时区为该会话设置默认时区。

可以使用PHP函数date_default_timezone_set设置任何特定的时区。为用户设置指定的时区。

基本上，用户的时区会传到客户端，所以我们必须使用JavaScript。

下面是使用PHP和JavaScript获取用户时区的脚本。

<?php
    #http://www.php.net/manual/en/timezones.php List of Time Zones
    function showclienttime()
    {
        if(!isset($_COOKIE['GMT_bias']))
        {
?>

            <script type="text/javascript">
                var Cookies = {};
                Cookies.create = function (name, value, days) {
                    if (days) {
                        var date = new Date();
                        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
                        var expires = "; expires=" + date.toGMTString();
                    }
                    else {
                        var expires = "";
                    }
                    document.cookie = name + "=" + value + expires + "; path=/";
                    this[name] = value;
                }

                var now = new Date();
                Cookies.create("GMT_bias",now.getTimezoneOffset(),1);
                window.location = "<?php echo $_SERVER['PHP_SELF'];?>";
            </script>

            <?php

        }
        else {
          $fct_clientbias = $_COOKIE['GMT_bias'];
        }

        $fct_servertimedata = gettimeofday();
        $fct_servertime = $fct_servertimedata['sec'];
        $fct_serverbias = $fct_servertimedata['minuteswest'];
        $fct_totalbias = $fct_serverbias – $fct_clientbias;
        $fct_totalbias = $fct_totalbias * 60;
        $fct_clienttimestamp = $fct_servertime + $fct_totalbias;
        $fct_time = time();
        $fct_year = strftime("%Y", $fct_clienttimestamp);
        $fct_month = strftime("%B", $fct_clienttimestamp);
        $fct_day = strftime("%d", $fct_clienttimestamp);
        $fct_hour = strftime("%I", $fct_clienttimestamp);
        $fct_minute = strftime("%M", $fct_clienttimestamp);
        $fct_second = strftime("%S", $fct_clienttimestamp);
        $fct_am_pm = strftime("%p", $fct_clienttimestamp);
        echo $fct_day.", ".$fct_month." ".$fct_year." ( ".$fct_hour.":".$fct_minute.":".$fct_second." ".$fct_am_pm." )";
    }

    showclienttime();
?>

但在我看来，最好是询问用户在你的项目中是否必须注册。

下面是一篇文章(带源代码)，解释如何在ASP中确定和使用本地化时间。净(VB。NET, c#)应用程序:

是时候了

In short, the described approach relies on the JavaScript getTimezoneOffset function, which returns the value that is saved in the session cookie and used by code-behind to adjust time values between GMT and local time. The nice thing is that the user does not need to specify the time zone (the code does it automatically). There is more involved (this is why I link to the article), but provided code makes it really easy to use. I suspect that you can convert the logic to PHP and other languages (as long as you understand ASP.NET).

JavaScript:

function maketimus(timestampz)
{
    var linktime = new Date(timestampz * 1000);
    var linkday = linktime.getDate();
    var freakingmonths = new Array();

    freakingmonths[0]  = "jan";
    freakingmonths[1]  = "feb";
    freakingmonths[2]  = "mar";
    freakingmonths[3]  = "apr";
    freakingmonths[4]  = "may";
    freakingmonths[5]  = "jun";
    freakingmonths[6]  = "jul";
    freakingmonths[7]  = "aug";
    freakingmonths[8]  = "sep";
    freakingmonths[9]  = "oct";
    freakingmonths[10] = "nov";
    freakingmonths[11] = "dec";

    var linkmonthnum = linktime.getMonth();
    var linkmonth = freakingmonths[linkmonthnum];
    var linkyear = linktime.getFullYear();
    var linkhour = linktime.getHours();
    var linkminute = linktime.getMinutes();

    if (linkminute < 10)
    {
        linkminute = "0" + linkminute;
    }

    var fomratedtime = linkday + linkmonth + linkyear + " " +
                       linkhour + ":" + linkminute + "h";
    return fomratedtime;
}

只需将您的时间以Unix时间戳格式提供给该函数即可;JavaScript已经知道用户的时区。

是这样的:

PHP:

echo '<script type="text/javascript">
var eltimio = maketimus('.$unix_timestamp_ofshiz.');
document.write(eltimio);
</script><noscript>pls enable javascript</noscript>';

这将始终显示正确的时间基于时区的人已设置在他/她的计算机时钟。没有必要向任何人索取任何东西，把它保存到合适的地方，感谢上帝!

首先，了解JavaScript中的时区检测是不完善的。您可以在date对象的实例上使用getTimezoneOffset获取特定日期和时间的本地时区偏移量，但这与完整的IANA时区(如America/Los_Angeles)不完全相同。

以下是一些可行的方法:

大多数现代浏览器在实现ECMAScript国际化API时都支持IANA时区，所以你可以这样做:

const tzid = Intl.DateTimeFormat（）.solveOptions（）.timeZone; console.log（tzid）;

结果是一个字符串，其中包含运行代码的计算机的IANA时区设置。

支持的环境列在Intl兼容性表中。展开DateTimeFormat部分，并查看名为resolvedOptions()的特性。timeZone默认为主机环境。

Some libraries, such as Luxon use this API to determine the time zone through functions like luxon.Settings.defaultZoneName. If you need to support an wider set of environments, such as older web browsers, you can use a library to make an educated guess at the time zone. They work by first trying the Intl API if it's available, and when it's not available, they interrogate the getTimezoneOffset function of the Date object, for several different points in time, using the results to choose an appropriate time zone from an internal data set. Both jsTimezoneDetect and moment-timezone have this functionality. // using jsTimeZoneDetect var tzid = jstz.determine().name(); // using moment-timezone var tzid = moment.tz.guess(); In both cases, the result can only be thought of as a guess. The guess may be correct in many cases, but not all of them. Additionally, these libraries have to be periodically updated to counteract the fact that many older JavaScript implementations are only aware of the current daylight saving time rule for their local time zone. More details on that here.

最终，更好的方法是向用户询问他们所在的时区。提供一个他们可以改变的设置。你可以使用上面的选项之一来选择一个默认设置，但不要让它不可能偏离你的应用程序。

还有一种完全不同的方法，即完全不依赖用户电脑的时区设置。相反，如果可以收集纬度和经度坐标，则可以使用以下方法之一将它们解析为时区。这在移动设备上效果很好。