Bogleheads:Sandbox

TemplateWizard extension test
Produces:

Extension:TemplateData only permits dates in ISO format and will have to be manually edited.

In the visual editor (not enabled for the Sandbox), date accepts any format, such as July 8, 2013. See Help:TemplateData.

"In the visual editor and the 2017 wikitext editor, 'date' has no visible effect."

Testing {{{tlx|Cite web}} and the TemplateWizard. The  was entered exactly as the output format. It produced:

TemplateData type date vs string
After updating the TemplateData for the dates in ISO format restriction has been removed and the TemplateWizard inserted

Not fixed
Date type as string does not perform an input validation check, which is done in VisualEditor. For example, an invalid date in Cite web shows an error:

Realtime preview
Realtime preview now enabled for text-based wikitext source editor.