helllo again,

i a have a "Y" column of date entry.

Most of dates are repeated, some are entered once.

I need to count only the number of dates (excldg repetitions).

example
15-Sep-09
22-Sep-09
20-Oct-09
20-Oct-09
20-Oct-09
22-Oct-09

From above 6 dates; the unique count should be 4.

thanks