Please provide more information about the issue you are encountering with your date picker. If possible please provide a link to where this date picker is available so I can check.
I have been a website developer for more than 7 years, working for a private company making and maintaining administrative website and developer tools. I work with websites built with PHP, MySQL, Javascript, Wordpress, Laravel and more.
Please feel free to send me a message so we can discuss further details. Thanks.