减去日期时间值

Question

I have the upload date for a course saved in a ViewModel variable @Model.Course.UploadDate when calling the following code:

alert('@Model.Course.UploadDate');

I get an output as expected of:

21/01/2014 16:16:13

I know want to check that the uploadDate is within the last 10 seconds before sending a statement to the database but trying to use the following code:

var uploadDate = new Date('@Model.Course.UploadDate.ToLongDateString()');
alert("UPLOAD DATE " + uploadDate);

I get an unexpected output of:

Tue Jan 21 2013 00:00:00 GMT+0000

This is the format that I need the date in only with the saved time data shown. I am then looking to perform a calculation as follows:

var TENSECONDS = 10 * 1000;
var uploadDate = new Date('@Model.Course.UploadDate.ToLongDateString()');
var today = new Date();
var check = today - uploadDate;

if (parseInt(check) > parseInt(TENSECONDS))
        alert("ROUTE1");
    else
        alert("ROUTE2");

Answer 1

Quote from the documentation of the Date object constructor:

value: Integer value representing the number of milliseconds since 1 January 1970 00:00:00 UTC (Unix Epoch).

So actually that's the safest thing to pass to the constructor of a Date object instead of some strings which might be incorrectly interpreted and are completely culture dependent.

So just convert your DateTime instance to the number of milliseconds that elapsed since 1 January 1970 and feed this timestamp to the constructor:

var timestamp = @(Model.Course.UploadDate - new DateTime(1970, 1, 1)).TotalSeconds;
var uploadDate = new Date(timestamp);

As an alternative you could use the ISO8601 format if you intend to be passing a string:

dateString: String value representing a date. The string should be in a format recognized by the Date.parse() method (IETF-compliant RFC 2822 timestamps and also a version of ISO8601).

So:

var uploadDate = new Date('@Model.Course.UploadDate.ToString("o")');

Answer 2

I solved this using the following code:

var dateArray = new Array();
dateArray = '@Model.Course.UploadDate'.split("/");
var dateD = dateArray[0];
var dateM = dateArray[1];
var dateY = dateArray[2];
var dateT = dateArray[3];
timeArray = dateT.split(":");
var timeH = timeArray[0];
var timeM = timeArray[1];
var timeS = timeArray[2];
var dateUS = dateM + "/" + dateD + "/" + dateY + dateT;
var uploadDate = new Date(dateD,dateM,dateY,timeH,timeM,timeS);