if you just need the date, since it is a datetime array...
shared datetimevar aDate;
aDate[1];
you can of course use a variable...if this is something that is going to be grouped on, I would have another shared variable running that is the index to the aDate array, like:
shared datetimevar array aDate;
shared numbervar aDateIndex;
aDate[aDateIndex];
then in you group footer or somewhere increment aDateIndex like;
shared numbervar aDateIndex;
aDateIndex := aDateIndex + 1;
I don't know if CR will group on an array like this, it probably will as long as the array is 'defined'/populated before the grouping takes place (like in the report header as it is only called once per report.
HTH