Get the value of bootstrap Datetimepicker in JavaScript

Either use:

$("#datetimepicker1").data("datetimepicker").getDate();

Or (from looking at the page source):

$("#datetimepicker1").find("input").val();

The returned value will be a Date (for the first example above), so you need to format it yourself:

var date = $("#datetimepicker1").data("datetimepicker").getDate(),
    formatted = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate() + " " + date.getHours + ":" + date.getMinutes() + ":" + date.getSeconds();
alert(formatted);

Also, you could just set the format as an attribute:

<div id="datetimepicker1" class="date">
    <input data-format="yyyy-MM-dd hh:mm:ss" type="text"></input>
</div>

and you could use the $("#datetimepicker1").find("input").val();

It seems the doc evolved.

One should now use : $("#datetimepicker1").data("DateTimePicker").date().

NB : Doing so return a Moment object, not a Date object

To call the Bootstrap-datetimepikcer supported functions, you should use the syntax:

$('#datetimepicker').data("DateTimePicker").FUNCTION()

So you can try the function:

$('#datetimepicker').data("DateTimePicker").date();

Documentation: http://eonasdan.github.io/bootstrap-datetimepicker/Functions/