What is equivalent of DateTime.ToOADate() in javascript?

Question

How can I get the OADate (OLE Automation date) in javascript? I need to pass my date object (to my web service) in the form of a double value.

in c#:

Answer 1

Those look good for JS above, but if you want to do convert it into a Unix timestamp in PHP, use the following:

// $ms_date_floating_point is the MS date
// 42372.3432210648 converts to Sun Jan 3rd, 2016
$ms_date_seconds = $ms_date_floating_point * 60 * 60 * 24;
$unix_timestamp_seconds = strtotime("Nov 11, 1899 00:00:00") + $ms_date_seconds;