Use date picker in a field while creating a tiddler

<$action-sendmessage $message="tm-new-tiddler" ...> defines the initial values of the desired fields.
But it doesn’t change anything in the default EditTemplate. To actually use the <$edit-date> widget in the EditTemplate, do this:

  1. Create a tiddler (e.g., NewContactEditTemplate), tagged with $:/tags/EditTemplate, containing:
<$list filter="[<currentTiddler>tag[Contact]]">
First met on: <$edit-date field="first-met-on" format="YYYY-MM-DD ddd" />
</$list>
  1. While viewing this new edit template tiddler, click on the $:/tags/EditTemplate tag “pill”, and drag-and-drop the NewContaactEditTemplate title so it is just after $:/core/ui/EditTemplate/body

  2. To hide the default display of the “first-met-on” field (so only your custom field input is shown in the editor), create a tiddler named $:/config/EditTemplateFields/Visibility/first-met-on and set it’s text field value to hide

enjoy,
-e