Seems like a client of mine noticed a bug on your plugin today, where for some weird reason, you can't select the date mentioned in the title.

Try it yourself on the demo page and you can't even select day 18 there.

I can select the 19th October 2014 fine on my laptop (Chrome, Mavericks, currently in "Quito" timezone). There has been a number of problems with time zones and this plugin (e.g. #22) and it sounds like this may be related.

I'm afraid I don't support this plugin any more but I'll accept a pull request (on Github: https://github.com/vitch/jQuery-datepicker ) if you can get to the bottom of it.,,