DB2 supports four Date formats. Those are ISO, USA, EUR and JIS. Knowing of these help you understand its meaning.
International Organization for Standardization (ISO)
IBM USA Standard (USA)
HH:MM AM or PM
IBM European Standard (EUR)
Japanese Industrial Standard (JIS)
Site Specific (LOC)
Based on database territory and country code, For date formats, YYYY = Year, MM = Month, and DD = Day;
for time formats, HH = Hour, MM = Minute, and SS = Seconds.