Converting string time into milliseconds

Question

I have a set of individual json data, they each have a time stamp for when it was created in this exact format e.g.

 [ {"Name": "Jake", "created":"2013-03-01T19:54:24Z" },
   {"Name": "Rock", "created":"2012-03-01T19:54:24Z" } ]

As a result I wish to use 'created' within a function which calculates that if the data was entered 60days or less from today it will appear in italic. However, the function I've attempted has no effect. I'm attempting to do the calculation in milliseconds:

     node.append("text")
    .text(function(d) { return d.Name; })
    .style("font", function (d)
           { var date = new Date(d.created);
             var k = date.getMilliseconds;
             var time = new Date ();
             var n = time.getTime();

       if(k > (n - 5184000) )  {return " Arial 11px italic"; }
                     else { return " Arial 11px " ; }


        })

I am curious whether I am actually converting the data at all into milliseconds. Also, if I am getting todays date in milliseconds.

Thanks in advance

EDIT: Example - http://jsfiddle.net/xwZjN/84/

Dioptase

Gonna say it: NOT JSON data! – Bombacaceous

Answer 1

To get the milliseconds since epoch for a date-string like yours, use Date.parse():

// ...
var k = Date.parse( d.created );
// ...

Quimper

Date.parse("2013-03-01T19:54:24Z") should do as you ask. I'm fairly certain this answer is correct. – Viscose

Yes, i thought so too - but in this example: jsfiddle.net/xwZjN/84 .. the text does not change - perhaps its something else? – Dioptase

I finally found out what it was! I had the font styling in the incorrect order it needed to be : "Bold 11px Arial" ! – Dioptase

@RozzA Together with the rest of his code it worked. – Quimper

this returns the unix timestamp (integer) I was hoping it returns a Date object – Myo

@RoxanaTapia Then wrap it into another new Date( Date.parse( x ) ). – Quimper

@Quimper then again the milliseconds get lost – Myo

Date.parse(strDate) will only work, if your strDate is in mm/dd/yyyy format. – Reinertson

@Avinash This is actually not true according to MDN. – Quimper

Answer 2

let t = "08:30"; // hh:mm
let ms = Number(t.split(':')[0]) * 60 * 60 * 1000 + Number(t.split(':')[1]) * 60 * 1000;
console.log(ms);

let t = "08:30"; // mm:ss
let ms = Number(t.split(':')[0]) * 60 * 1000 + Number(t.split(':')[1]) * 1000;
console.log(ms);

Idiopathy

Answer 3

If you string is in the form of mm:ss, Follow the procedure and resolve,

var t = "08:00";
var r = Number(t.split(':')[0])*60+Number(t.split(':')[1])*1000;
console.log(r)

Oscillatory

Wrong calculation in your solution. See my solution below. – Idiopathy

Hours need one more *60 and minutes also needs a *60 => var r = Number(t.split(':')[0])*60*60+Number(t.split(':')[1])*60*1000; – Repellent

Answer 4

var timeInString = "99:99:99:99"; // Any value here
var milliseconds;
if (timeInString.split(":").length === 2) {
  /* For MM:SS */
  milliseconds =
    Number(timeInString.split(":")[0]) * 60000 +
    Number(timeInString.split(":")[1]) * 1000;
} else if (timeInString.split(":").length === 3) {
  /* For HH:MM:SS */
  milliseconds =
    Number(timeInString.split(":")[0]) * 3600000 +
    Number(timeInString.split(":")[1]) * 60000 +
    Number(timeInString.split(":")[2]) * 1000;
} else if (timeInString.split(":").length === 4) {
  /* For DD:HH:MM:SS */
  milliseconds =
    Number(timeInString.split(":")[0]) * 86400000 +
    Number(timeInString.split(":")[1]) * 3600000 +
    Number(timeInString.split(":")[2]) * 60000 +
    Number(timeInString.split(":")[3]) * 1000;
}

console.log(`Milliseconds in ${timeInString} - ${milliseconds}`);

Bolt

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