dhtmlxCalendar

dhtmlxCalendar features custom date format, any day as the first day of week, year drop down list, various skins and languages. Optionally the calendar can be set graggable. The component also can be used as a date range selection tool in double mode, in that case dates prior/after selected date will be disabled accordingly.
Like other dhtmlx components, dhtmlxCalendar provides complete Javascript API to give developers enough possibilities to control its state and behavior.
dhtmlxCalendar website
dhtmlxCalendar samples
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