Question

我有一个JavaScript问题似乎无法解决：

我将Date转换为时间戳，当我将其转换回来时，它会显示正确的DateTime：

DateTime to Timestamp：

var ts = Math.floor(Date.now() / 1000);

和返回 - 时间戳到日期：

 var a = new Date(ts * 1000);
 var months = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
 var year = a.getFullYear();
 var month = months[a.getMonth()];
 var date = a.getDate();
 var hour = a.getHours();
 var min = a.getMinutes();
 var sec = a.getSeconds();
 var formattedTime = date + ' ' + month + ' ' + year + ' ' + hour + ':' + min + ':' + sec ;

问题是当我使用输入数据而不是使用Date.now（）时，它会转换为时间戳，但是当我将其转换回dateTime时， Hour 参数恰好提前4小时。

var destinationDateTimeStr_ = document.getElementById("dateyear").value+"-"+document.getElementById("datemonth").value+"-"+document.getElementById("dateday").value+"T"+document.getElementById("datehour").value+":"+document.getElementById("dateminute").value+":00";

//convert date as string to timezone
var date2 = new Date(destinationDateTimeStr_); //2018-06-16T15:35:00
ts_ = Math.floor(date2 / 1000);

和返回 - 时间戳到日期：

 var a = new Date(ts_ * 1000);
 var months = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
 var year = a.getFullYear();
 var month = months[a.getMonth()];
 var date = a.getDate();
 var hour = a.getHours();
 var min = a.getMinutes();
 var sec = a.getSeconds();
 var formattedTime = date + ' ' + month + ' ' + year + ' ' + hour + ':' + min + ':' + sec ;


//returns: 2018-06-16T11:35:00 - 4 hours earlier

如果所有转换都在同一个客户端（同一时区）完成，那该怎么办？

然后我尝试了：

var offset = new Date().getTimezoneOffset();

但它返回-180，这只是3小时后而不是4

然后我尝试了：

var tz = Intl.DateTimeFormat().resolvedOptions().timeZone;

但是它给了我一个文本（在我的情况下意味着-2小时：亚洲/耶路撒冷）

我做错了什么？

Answer 1

（此答案遵循评论）

已经明确了Javascript Date会导致问题而OP选择了momentjs。

如果使用共享主机阻止您的客户端直接安装它，请将其包含在CDN中，例如https://cdnjs.com/libraries/moment.js/

Answer 2

哈哈!!我应该寻找那个...哎呀。非常感谢你！

与此同时，我写了这个（假设Date.now（）总是返回真实的准确值[可能不是这样]）：

function getTimestampMilisecondsGap()
{
        var currentdate = new Date(); 
        timestamp_1 = Math.floor(new Date(currentdate.getFullYear()+'-'+(currentdate.getMonth()+1)+'-'+currentdate.getDate()+'T'+currentdate.getHours()+':'+currentdate.getMinutes()+':00') / 1000); 
        //let dat = new Date(Date.UTC(currentdate.getFullYear(), currentdate.getMonth(), currentdate.getDate(), currentdate.getHours(), currentdate.getMinutes(), 00));
    //timestamp_1 = Math.floor( dat/ 1000);
    timestamp_2 = Math.floor(Date.now() / 1000); //this one is suppose to produce a correct timestamp
    var addTimeStampMilisecs = 0;
    if (timestamp_2 > timestamp_1)
    {
        addTimeStampMilisecs = timestamp_2-timestamp_1;
    }
    else if (timestamp_2 < timestamp_1)
    {
        addTimeStampMilisecs = timestamp_1-timestamp_2;
    }
    return addTimeStampMilisecs;
}



//writing a timestamp to the database
var destinationDateTimeStr = document.getElementById("dateyear").value+"-"+document.getElementById("datemonth").value+"-"+document.getElementById("dateday").value+"T"+document.getElementById("datehour").value+":"+document.getElementById("dateminute").value+":00";

var date2 = new Date(destinationDateTimeStr);

var eventDateTS = Math.floor(date2 / 1000); //convert to timestamp (with incorrect timezone)
eventDateTS += getTimestampMilisecondsGap(); //add (or decrese) the number of miliseconds from the timestamp because this function that generates the tmestamp returns a wrong number (the hour in the converted date is wrong)

//write the correct eventDateTS to your DB here...

Javascript - 将DateTime转换为时间戳，然后返回DateTime

2 个答案: