[1] SAS Help Center: Microsoft Access Database Files, 11/16/2023, 12:44:34 PM, 11/25/2023, 10:03:36 AM http://documentation.sas.com/doc/ja/pgmsascdc/9.4_3.5/acpcref/p0psac3j16cioen1nq2hkwrnk55y.htm

[2] In the year 9999... - The SAS Dummy, 11/25/2023, 10:03:53 AM https://blogs.sas.com/content/sasdummy/2010/04/05/in-the-year-9999/

[3] 関連: 暦法改良案, データベースの日時