This option controls the handling of two-digit years when converting from strings to dates or timestamps.
The nearest_century setting is a numeric value that acts as a rollover point. Two digit years less than the value are converted
to 20yy, while years greater than or equal to the value are converted to 19yy.
The historical SQL Anywhere behavior is to add 1900 to the year. Adaptive Server Enterprise behavior is to use the nearest
century, so for any year where value yy is less than 50, the year is set to 20yy.