Default: 50
Range: 0 – 99

The dms_subtypes in the 30s, 60s, and 90s have a 2-digit year value (yy) representing dates in both the 20th and 21st centuries, depending on how the century_break configuration parameter is set. That is, yy values < 50 are 21st century years (20yy) and yy values >= 50 are 20th century years (19yy). If the century_break value is set to 50, yy = 1950–2049, and if the century_break value is set to 11, yy = 1911–2010.

You can find available DMSII date formats for the century_break parameter at Cloning DMSII Dates, Times, and Date/Times.