The templates are stored in the message catalog:

# -- Date formats --
date.format=dd/MM/yyyy
date.time.format=dd/MM/yyyy HH:mm
# jquery datepicker has a different formatter to standard java
datepicker.date.format=dd/mm/yy

date.format and date.time.format are used for formatting dates within the storefront application. datepicker.date.format is used to format the date received from the jQuery date picker widget.