In order to set date2cal for mailformplus we need to follow 3 important steps: 1. Include the necessary js and css files page.headerData.80 = TEXT page.headerData.80.value ( <script type="text/javascript" src="typo3conf/ext/date2cal/js/jscalendar/calendar.js"></script> <script type="text/javascript" src="typo3conf/ext/date2cal/js/jscalendar/lang/calendar-en.js"></script> <script type="text/javascript" src="typo3conf/ext/date2cal/js/jscalendar/calendar-setup.js"></script> <script type="text/javascript" src="typo3conf/ext/date2cal/js/date2cal.js"></script> <script type="text/javascript" src="typo3conf/ext/date2cal/js/naturalLanguageParser.js"></script> <link rel="stylesheet" type="text/css" href="typo3conf/ext/date2cal/js/jscalendar/skins/aqua/theme.css" /> ) # add translations # French – DEFAULT [...]