css取决于美国当前时间[重复]

Question

我有这个代码工作，但它读取他们的计算机的当前时间，我只想从美国获得小时数！不管你是否从其他国家访问它，css将根据美国时间使用。

 <script type="text/javascript">
datetoday = new Date(); // create new Date()
timenow = datetoday.getTime(); // grabbing the time, it is now
datetoday.setTime(timenow); // setting the time now to datetoday variable
hournow = datetoday.getHours();  //the hour it is

 <script type="text/javascript">
 $(document).ready(function () {
datetoday = new Date(); // create new Date()
timenow = datetoday.getTime(); // grabbing the time it is now
datetoday.setTime(timenow); // setting the time now to datetoday variable
hournow = datetoday.getHours();  //the hour it is


if (hournow >= 18)  // if it is after 6pm
    $('body').addClass('evening');
else if (hournow >= 12) // if it is after 12pm
    $('body').addClass('afternoon');
else if (hournow >= 6)  // if it is after 6am
    $('body').addClass('morning');
else if (hournow >= 0)  // if it is after midnight
    $('body').addClass('midnight');
});
 </script>

Answer 1

使用Date.getTimezoneOffset（）获取用户时区和UTC时间之间的差异。然后，如果您知道UTC时间和您需要的时区之间的差异：

var TIME_OFFSET = 5; //five hours difference to US East time.
var date = new Date();
date.setMinutes(date.getHours() + (date.getTimezoneOffset() / 60) - TIME_OFFSET);
var usHour = date.getHours();