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I'd be extremely useful to have a xen: tag to allow you to create date/time inputs in admin templates. Without a xen: tag I assume we'd have to craft the HTML ourselves to make it look like the rest of the auto-generated options?
I believe you're referring to the {xen:date} and {xen:time} templates that are already available. More info on their latest updates is in the Beta 6 release thread.