[capink]

You could use a composite column with conditional formatting. Problem is how would you tell whether a date like 1985-01-01 is an actual date or a pretend date?

If you will presume that every date that starts with 01-01 is a pretend date, a template like this should work:

program:
	m = format_date(field('timestamp'), 'M');
	d = format_date(field('timestamp'), 'd');
	if m == 1 then
		if d == 1 then
			format_date(field('timestamp'), 'yyyy')
		else
			format_date(field('timestamp'), 'dd-MM-yyyy')
		fi
	else
		format_date(field('timestamp'), 'dd-MM-yyyy')
	fi