Code 122 - Coded Data Field: Time period of item content (R)Indicator 1: Number of Dates Indicator 0 Singledated item 1 Multiple single dates 2 Range of dates Indicator 2: blankSubfield codes $a Time period, 9999 B.C. to present (Mandatory, Repeatable) $a/0 Era identifierc = date falls before the year 1 in the Gregorian calendar, i.e. B.C. d = date falls after the year 1 in the Gregorian calendar, i.e. A.D.$a/1-4 Year (Mandatory.) $a/5-6 Month $a/7-8 Day $a/9-10 Time