All programmers know that it is normal to include calendars in your web applications, so that future users can interact with them and select dates. This Tigra Calendar saves you a lot of effort, as it is a library in JavaScript that gives you the functions to automatically generate the calendar, and so be able to include it in your website.
The calendars in Tigra Calendar are personalizable via CSS style sheets, and you can attach them as fields in a form, or create them dynamically at the time of running (ideal for AJAX applications); it also supports different date formats, it works with browsers, it can be used in different programming languages: PHP, ASP, CGI, etc.
But the best thing about Tigra Calendar is that it`s totally free.