添加或减去 javascript 日期的时区差异
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add or subtract timezone difference to javascript Date
提问by halliewuud
What is the best approach to add or subtract timezone differences to the targetTimevariable below. The GMT timezone values comes from the DB in this format: 1.00for London time, -8.00for Pacific time and so on.
在targetTime下面的变量中添加或减去时区差异的最佳方法是什么。GMT 时区值以这种格式来自数据库：1.00伦敦时间、-8.00太平洋时间等。
Code looks like this:
代码如下所示：
date = "September 21, 2011 00:00:00";
targetTime = new Date(date);
回答by alexp
You can use Date.getTimezoneOffset which returns the local offset from GMT in minutes. Note that it returns the value with the opposite sign you might expect. So GMT-5 is 300 and GMT+1 is -60.
您可以使用 Date.getTimezoneOffset 以分钟为单位返回 GMT 的本地偏移量。请注意，它返回的值与您可能期望的符号相反。所以 GMT-5 是 300，GMT+1 是 -60。
var date = "September 21, 2011 00:00:00";
var targetTime = new Date(date);
var timeZoneFromDB = -7.00; //time zone value from database
//get the timezone offset from local time in minutes
var tzDifference = timeZoneFromDB * 60 + targetTime.getTimezoneOffset();
//convert the offset to milliseconds, add to targetTime, and make a new Date
var offsetTime = new Date(targetTime.getTime() + tzDifference * 60 * 1000);
回答by user2875462
Simple function that works for me:
对我有用的简单功能：
adjustForTimezone(date:Date):Date{
var timeOffsetInMS:number = date.getTimezoneOffset() * 60000;
date.setTime(date.getTime() - timeOffsetInMS);
return date
}
回答by Marcos Lima
If you need to compensate the timezone I would recommend the following snippet:
如果您需要补偿时区，我会推荐以下代码段：
var dt = new Date('2018-07-05')
dt.setMinutes(dt.getMinutes() + dt.getTimezoneOffset())
console.log(dt)
