An interactive date picker plugin based on Pikaday. A demo can be found here: http://kixam.github.io/TW5-datePicker/.

datepicker is a TiddlyWiki plugin that allows you to use a widget much like EditTextWidget to pick a date, and optionaly a time. It shows a nice interactive mini-calendar when clicked, allows you to set a date format for display, and is compatible with core date fields such as modified and created.