Question

How I will convert this time 11:34 to javascript timestamps. Any javascript functionality available for that.

I am trying to create a floting graph for that I am using Flot library. In my graph time on x axis and count on y axis. For creating data part I need to convert time to timestamp like that thay specified on API doc.

http://people.iola.dk/olau/flot/API.txt

This is my code

var datasets = {
    "usa": {
        label: "Logged Users",
        data: [[10:55, 4], [11:00, 1], [11:05, 4], [11:10, 2], [11:15, 3], [11:20, 1], [11:25, 5]]
    }
};

if (datasets.length > 0){
    $.plot($("#placeholder"), datasets, {
        yaxis: { min: 0,tickDecimals: 0 },
        xaxis: {  mode: "time",timeformat: "%H:%M" }
    });
}

It will not work because I specified exact time instead of a number. So I need to convert that to timestamps format.
Please help me.

Thanks

Answer 1

Use an instance of the Date object:

var sTime = '11:34';
var oDate = new Date();
oDate.setUTCHours(
    parseInt(sTime.substr(0, 2), 10),
    parseInt(sTime.substr(3, 2), 10),
    0,
    0
);
var sTimestamp = oDate.getTime();

Also see this example.

=== UPDATE ===

When the time is local time instead of UTC, then you can set the time with:

oDate.setHours(
    parseInt(sTime.substr(0, 2), 10),
    parseInt(sTime.substr(3, 2), 10),
    0,
    0
);

Also see this example.

P.s.: the result of getTime() is in milliseconds.

=== UPDATE ===

To map your current dataset you can use following script (with UTC; if you want local time remove the UTC in the setter):

var aCountries = [ "usa" ];
var oDate = new Date();
oDate.setSeconds(0, 0);
for (var i = 0; i < aCountries.length; i++) {
    datasets[aCountries[i]].data =
        datasets[aCountries[i]].data.map(function(oElement) {
            oDate.setUTCHours(
                parseInt(oElement[0].substr(0, 2), 10),
                parseInt(oElement[0].substr(3, 2), 10)
            );
            return [
                oDate.getTime()
                , oElement[1]
            ];
        });
}

Also see this example.