This is very easy to use JavaScript Calendar Control with so many customization option. Date format can be change as different database support different date formats. It also supports multiple instances on same time and all the instances are completely independent with others. It is compatible will all major browsers and different style sheets can be defined to all different instances means every instance can be show in different color scheme on the same page. It also support expiry date feature so you can prevent users to select past dates. There are lots of other customization options as well.