Converting DOMTimeStamp to localized HH:MM:SS MM-DD-YY via Javascript

The W3C Geo开发者_C百科location API (among others) uses DOMTimeStamp for its time-of-fix.

This is "milliseconds since the start of the Unix Epoch".

What's the easiest way to convert this into a human readable format and adjust for the local timezone?

One version of the Date constructor takes the number of "milliseconds since the start of the Unix Epoch" as its first and only parameter.

Assuming your timestamp is in a variable called domTimeStamp, the following code will convert this timestamp to local time (assuming the user has the correct date and timezone set on her/his machine) and print a human-readable version of the date:

var d = new Date(domTimeStamp);
document.write(d.toLocaleString());

Other built-in date-formatting methods include:

Date.toDateString()
Date.toLocaleDateString()
Date.toLocaleTimeString()
Date.toString()
Date.toTimeString()
Date.toUTCString()

Assuming your requirement is to print the exact pattern of "HH:MM:SS MM-DD-YY", you could do something like this:

var d = new Date(domTimeStamp);
var hours = d.getHours(),
    minutes = d.getMinutes(),
    seconds = d.getSeconds(),
    month = d.getMonth() + 1,
    day = d.getDate(),
    year = d.getFullYear() % 100;

function pad(d) {
    return (d < 10 ? "0" : "") + d;
}

var formattedDate = pad(hours) + ":"
                  + pad(minutes) + ":"
                  + pad(seconds) + " "
                  + pad(month) + "-"
                  + pad(day) + "-"
                  + pad(year);

document.write(formattedDate);

var d = new Date(millisecondsSinceEpoch);

You can then format it however you like.

You may find datejs, particularly its toString formatting, helpful.