Can't use calendar's date format (DATE_FORMAT_SPIFFYCAL)!

Problem

Error message " Can't use calendar's date format (DATE_FORMAT_SPIFFYCAL)! " and no changes are made.

Solution
Check admin/includes/languages/english.php has the define of

define('DATE_FORMAT_SPIFFYCAL', 'dd/MM/yyyy');

Should be around line27 after

define('DATE_TIME_FORMAT', DATE_FORMAT_SHORT . ' %H:%M:%S');

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