How to get date ticks in a javaScript?

Question

I have such a code in the C#:

public static decimal StringDateToDecimal(this string stringDate)
{
    var cultureInfo = new CultureInfo("ru-Ru");
    var date = DateTime.Parse(stringDate, cultureInfo);
    var number = date.ToBinary();

    var unix = new DateTime(1970, 1, 1);
    var diff = (date - unix).Ticks;
    return (decimal)diff;
}

For 01 march 2018 it returns 15198624000000000.
But code in the js:

var from = $input.split(".");
var d = new Date(from[2], from[1] - 1, from[0]);
var dStart = new Date(1970, 1, 1);
var seconds = d.getTime();
var secondsStart = dStart.getTime();
var dateDifference = seconds - secondsStart;

For "01.03.2018" it returns 1517184000000

or

var ticks2 = ((d.getTime() * 10000) + 621355968000000000);
var ticks1 = ((dStart.getTime() * 10000) + 621355968000000000);

var difrent = ticks2 - ticks1;

What am I doing wrong in the js code?
I want to get the same value in the js

Answer 1

• JavaScript: Date.getTime(): a number, representing the number of milliseconds since midnight January 1, 1970.

• C#: A single tick represents one hundred nanoseconds or one ten-millionth of a second. There are 10,000 ticks in a millisecond, or 10 million ticks in a second.

So, JavaScript ticks = (C# ticks / 10000) and your code looks OK. You just need to account for the difference in whichever code (C# or JavaScript) you choose.

If you take (an unambiguous day-month date) in JavaScript (e.g. 23 December 2018):

var $input = "23.12.2018";
var from = $input.split(".");

var dNew = new Date(from[2], from[1]-1, from[0]);
//Note dStart has 0 as month because JavaScript dates start at 0 and end with 11
var dStart = new Date(1970, 0, 1);
var seconds = dNew.getTime();
var secondsStart = dStart.getTime();
var dateDifference = seconds - secondsStart;
// multiply by 10000 to reconcile to c#
console.log("===> " + dateDifference * 10000);

Both answers come to 15455232000000000 if you use StringDateToDecimal("23 december 2018"); in your C# code.

I hope I'm getting the jist of what you are asking.

Answer 2

The JavaScript Date type's origin is the Unix epoch starting at midnight on 1 January 1970.

The .NET DateTime type's origin is midnight on 1 January 0001.

And for ticks, from the DateTime.Ticks docs:

A single tick represents one hundred nanoseconds or one ten-millionth of a second. There are 10,000 ticks in a millisecond, or 10 million ticks in a second.

So with all of that in mind, your code can be reduced to this:

var d = new Date(2018, 3, 1); // Your date
var dStart = new Date(1970, 1, 1);
var dateDifference = ((d.getTime() - dStart.getTime()) * 10000);
console.log(dateDifference); // 15198588000000000