[EpiData-list] How to select earlier date from multiple dates

Dear Forum Members,

I was looking a way to select earliest date from multiple date fields. Example,

Five date fields with dates as below, DateA - 13/01/2002 DateB - *13/01/2001* DateC - 13/01/2002 DateE - 13/01/2003 DateF - 13/01/2004

So, the programming to select earliest date (13/01/2001) in the field called "DateDiagnosis"

Thanks in advance.

Bijay Adhikari, PhD CD Epidemiologist Regina, SK