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CDASH recommends that dates be collected in an unambiguous format and suggests using the DD-MON-YYYY format. This defines the format to be presented to those entering the data, but does not define the electronic format in which to store the data. One system may store each date as a character field; another may store them as numeric values (e.g., an SAS date); and yet another as 3 separate fields formatted as day, month, and year. Each of these is a legitimate way to store the data collected.