How to embed a calendar

I would like to change the Dublin Core format so that when a admin goes to add Date to the field that instead of the box they can use a calendar instead to pick the date. That way all dates are in the same format. I have the code for creating the calendar feature; however, I am not sure where in the Omeka files I would edit to call the calendar.php?

You're going to want to do this as a plugin, using the ElementInput filter. That filter will let you replace the normal textarea for the Date input with whatever markup you want.