convert string to date javascript from Session variable

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hi,

i am trying to get value from Session Variable in javascript
and want to convert into time format

i have tried is

JavaScript

function SessionTime() {

      var someSessionVariable = new Date('<%= Session["LogInTime"].ToString() %>'); //Date.parseDate(@Session["LogInTime"],"dd/MM/yyyy");
         alert(someSessionVariable);
     document.getElementById("SessionTime").innerHTML = someSessionVariable.toLocaleTimeString();
      window.setTimeout("SessionTime()", 1000); // Here 1000(milliseconds) means one 1 Sec
  }

i am getting invalid date on alert(someSessionVariable);

all i wanted to do is

show a user a elapsed time from the time of login which i am getting in '<%= Session["LogInTime"].ToString() %>'

please help!!!

Posted 29-Jul-14 20:52pm

Omkaara

Updated 29-Jul-14 21:41pm

Nirav Prabtani

v4

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2 solutions

Solution 1

Use DateTime.TryParse[^] to convert string value into a DateTime.

Then simply take a difference between current date value and this date time value to get the difference.

You can also use the TimeSpan class to calculate the difference.
Here[^] is an example of difference using TimeSpan.Subtract.

Posted 29-Jul-14 20:56pm

Abhinav S

Comments

Omkaara 30-Jul-14 2:57am

all of above i have to do in Javascript

Abhinav S 30-Jul-14 3:00am

No. In your ASP.Net code.

Omkaara 30-Jul-14 3:08am

above code is in javascript
my requirement is to do it in javascript

Abhinav S 30-Jul-14 3:41am

Its possible. Javascript has a Date.Parse() method.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse.
Other approaches - http://forums.asp.net/t/1861281.aspx?How+To+convert+string+into+datetime+in+javascript.

Calculating the difference between two dates - http://www.htmlgoodies.com/html5/javascript/calculating-the-difference-between-two-dates-in-javascript.html.

Omkaara 30-Jul-14 4:56am

i want to start timer from <%= Session["LogInTime"].ToString()

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Omkaara · Accepted Answer · 2014-07-30T00:34:00

JavaScript

function SessionTime() {

    var someSessionVariable = '<%= Session["LogInTime"].ToString() %>'; //Date.parseDate(@Session["LogInTime"],"dd/MM/yyyy");

    var startTime = new Date(someSessionVariable);
    var endTime = new Date();
    var timeDiff = endTime - startTime;
    timeDiff /= 1000;  // strip the miliseconds

     var secs = Math.round(timeDiff % 60);   // get seconds
    timeDiff = Math.floor(timeDiff / 60);    // remove seconds from the date

    var minutes = Math.round(timeDiff % 60);   // get minutes
     timeDiff = Math.floor(timeDiff / 60);     // remove minutes from the date

    var hours = Math.round(timeDiff % 24);   // get hours
     timeDiff = Math.floor(timeDiff / 24);   // remove hours from the date

    var days = timeDiff;  // the rest of timeDiff is number of days

    document.getElementById("lblSessionTime").innerHTML =days + " Days, " + hours + ":" + minutes + ":" + secs;
    window.setTimeout("SessionTime()", 1000); // Here 1000(milliseconds) means one 1 Sec
}