css取决于美国当前时间

Question

我有此代码工作，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！不要紧，如果你从另一个国家访问它，CSS将按照美国时间使用。

<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()来获取用户的时区和UTC时间之间的差异。 然后，如果你知道UTC时间，你需要的时区之间的区别：

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();