Tags: Year.
Year 1601 (MDCI) was a common year starting on Monday (link will display the full calendar) of the Gregorian calendar and a common year starting on Thursday of the 10-day slower Julian calendar. January 1 of this year (1601-01-01) is used as the base of file dates and of Active Directory Logon dates by Microsoft Windows. It is also the date from which ANSI dates are counted and were adopted by the American National Standards Institute for use with COBOL and other computer languages.