Firebird's "Sliding Century Window"

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SysUtils.TwoDigitYearCenturyWindow Variable

Determines what century is added to two-digit years when string dates are converted to numeric dates.

The value of TwoDigitYearCenturyWindow, if it is nonzero, is subtracted from the current year to calculate the floating "pivot" prior to which two-digit years are interpreted as falling in the next century. The default value is 50. The table below shows some examples.