Provided in free and commercial versions, the Zapatec Javascript Calendar acts as either a calendar showing events or a date picker. Users can pick a date from a popup or flat (in the page) calendar. The calendar package includes a wizard that makes it a snap to create a calendar with just the features you need. The Javascript Calendar has wide browser support, tooltips, the ability to choose time as well as dates, pick multiple dates, disallow picking certaindates and much more. Customization includes the ability to chose a theme, a language, first day of the week, and positioning. The package includes well documented color coded source code.