g.size() is not a function - Jquery Error

.size() was removed in version 3 of jQuery, use .length instead.

In your example, replace g.size() for g.length.

I had the same error as you, and I could not find a solution for it anywhere. In fact the only reference to the g.size() is not a function error was this question, at the time with only a single down vote.

My solution was to find a different datetime picker that actually worked

I found this one: https://github.com/xdan/datetimepicker, it was quite easy to get working:

1. download the zip from github

2. Include the files :

   <link href="./js/datetimepicker-master/build/jquery.datetimepicker.min.css" rel="stylesheet"> <script src="./js/datetimepicker-master/build/jquery.datetimepicker.full.min.js"></script>

3. This HTML

   <input id="datetimepicker" type="text" />

4. And this JS

   $.datetimepicker.setLocale('en');
   $('#datetimepicker').datetimepicker();

I got this up and working in a tiny fraction of the amount of time I'd wasted trying to get the bootstrap datetimepicker to stop giving me the g.size() error.

Of course there are many other datetime pickers available:

See this post for many more options : whats-a-good-javascript-time-picker