When the current century is added to a two-digit year, if the result
is more than 50 years in the future, the previous century is assumed.
If the result is more than 50 years in the past, the next century is assumed.
When the current century is added to a two-digit year, if the result
is more than 50 years in the future, the previous century is assumed.
If the result is more than 50 years in the past, the next century is assumed.