PopCalendarXP is arguably the most powerful and configurable JavaScript date picker available. There are very few, if any, things that other date pickers can do that PopCalendarXP can not. It features a compact javascript engine, database-drivenable events/agenda, real cross-broswer capability, extremely customizable user interface, super easy-to-use design and many other handy options. This datepicker is written 100% in JavaScript and works perfectly with ASP.Net, ASP, JSP, PHP, ColdFusion and other web frameworks.