Uncaught TypeError: $(...).datetimepicker is not a function

You might have

1. Forgetting to include the jQuery UI library.

2. Loading the jQuery UI library before the jQuery library.

3. Loading the jQuery library twice.

4. Specifying an incorrect path to the jQuery files.

5. Using a custom jQuery UI library that does not have a datepicker.

Note: To solve the "$(...).datepicker is not a function" jQuery error, make sure to load the jQuery library before loading the jQuery UI library. The libraries have to be loaded only once on the page, otherwise the error is thrown.

Please refer below url.

https://bobbyhadz.com/blog/jquery-datepicker-is-not-a-function#:~:text=To%20solve%20the%20%22%24(.,otherwise%20the%20error%20is%20thrown.&text=Copied!