Pardon me, but that's not an example of what you are using. That's code we have to download and unzip and install, just to see what you are talking about.
Can't you show this "live" someplace? Would be more likely to get people to look at it.
Likely if you pointed us to the "datetimepicker_css.js" code we could show you where to do that.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.