Scribe, from a 12th-century bestiary
A bestiary of the 12th Century A.D. gives us this illustration of its author at his writing desk.

Calendar of A.S., A.D., and A.U.C. years

The first SCA tournament was held May 1, 1966 A.D.  When?  The SCA, unlike a true historical recreational society, does not recreate a narrow span of time in which things are much the same.  At a Civil War recreation, for example, you will see the enactors wearing the clothes of that period, differing mainly in whether the participant is male or female, free or slave, military or civilian.  But the SCA represents everything before 1650, and it's not unusual to see a viking talking to a samurai, a norman crusader fighting an ancient greek, or a 12th-century Finn talking to an 8th-century Mayan.

The SCA rarely even specifies the year at which a single event occurs, so even at a particular event the year A.D. is not invoked, lest half the attendees instantly vanish.

Instead, whenever an actual date is needed in this timeless fairyland, the SCA uses its own calendar, which reckons time from the first SCA tournament.  As that tournament happened on May 1, the SCA's year also begins on May 1.  Here's a table showing how SCA years (A.S. for Anno Societatis, "in the year of the Society") correspond to normal years (A.D. for Anno Domini, "in the year of the Lord").  I've also added a column showing Roman years (A.U.C. for Ab urbe condita, "from the founding of the City").  The Roman calendar was the universal Western calendar until it was replaced by A.D. reckoning, and was still used by the Catholic Church until Vatican II, a few years before the SCA was founded.

A.S.
A.D.
A.U.C.
I 5/1/1966 to 4/30/1967 Kal. Mai. 2719 to pr. Kal. Mai. 2720
II 5/1/1967 to 4/30/1968 Kal. Mai. 2720 to pr. Kal. Mai. 2721
III 5/1/1968 to 4/30/1969 Kal. Mai. 2721 to pr. Kal. Mai. 2722
IV 5/1/1969 to 4/30/1970 Kal. Mai. 2722 to pr. Kal. Mai. 2723
V 5/1/1970 to 4/30/1971 Kal. Mai. 2723 to pr. Kal. Mai. 2724
VI 5/1/1971 to 4/30/1972 Kal. Mai. 2724 to pr. Kal. Mai. 2725
VII 5/1/1972 to 4/30/1973 Kal. Mai. 2725 to pr. Kal. Mai. 2726
VIII 5/1/1973 to 4/30/1974 Kal. Mai. 2726 to pr. Kal. Mai. 2727
IX 5/1/1974 to 4/30/1975 Kal. Mai. 2727 to pr. Kal. Mai. 2728
X 5/1/1975 to 4/30/1976 Kal. Mai. 2728 to pr. Kal. Mai. 2729
XI 5/1/1976 to 4/30/1977 Kal. Mai. 2729 to pr. Kal. Mai. 2730
XII 5/1/1977 to 4/30/1978 Kal. Mai. 2730 to pr. Kal. Mai. 2731
XIII 5/1/1978 to 4/30/1979 Kal. Mai. 2731 to pr. Kal. Mai. 2732
XIV 5/1/1979 to 4/30/1980 Kal. Mai. 2732 to pr. Kal. Mai. 2733
XV 5/1/1980 to 4/30/1981 Kal. Mai. 2733 to pr. Kal. Mai. 2734
XVI 5/1/1981 to 4/30/1982 Kal. Mai. 2734 to pr. Kal. Mai. 2735
XVII 5/1/1982 to 4/30/1983 Kal. Mai. 2735 to pr. Kal. Mai. 2736
XVIII 5/1/1983 to 4/30/1984 Kal. Mai. 2736 to pr. Kal. Mai. 2737
XIX 5/1/1984 to 4/30/1985 Kal. Mai. 2737 to pr. Kal. Mai. 2738
XX 5/1/1985 to 4/30/1986 Kal. Mai. 2738 to pr. Kal. Mai. 2739
XXI 5/1/1986 to 4/30/1987 Kal. Mai. 2739 to pr. Kal. Mai. 2740
XXII 5/1/1987 to 4/30/1988 Kal. Mai. 2740 to pr. Kal. Mai. 2741
XXIII 5/1/1988 to 4/30/1989 Kal. Mai. 2741 to pr. Kal. Mai. 2742
XXIV 5/1/1989 to 4/30/1990 Kal. Mai. 2742 to pr. Kal. Mai. 2743
XXV 5/1/1990 to 4/30/1991 Kal. Mai. 2743 to pr. Kal. Mai. 2744
XXVI 5/1/1991 to 4/30/1992 Kal. Mai. 2744 to pr. Kal. Mai. 2745
XXVII 5/1/1992 to 4/30/1993 Kal. Mai. 2745 to pr. Kal. Mai. 2746
XXVIII 5/1/1993 to 4/30/1994 Kal. Mai. 2746 to pr. Kal. Mai. 2747
XXIX 5/1/1994 to 4/30/1995 Kal. Mai. 2747 to pr. Kal. Mai. 2748
XXX 5/1/1995 to 4/30/1996 Kal. Mai. 2748 to pr. Kal. Mai. 2749
XXXI 5/1/1996 to 4/30/1997 Kal. Mai. 2749 to pr. Kal. Mai. 2750
XXXII 5/1/1997 to 4/30/1998 Kal. Mai. 2750 to pr. Kal. Mai. 2751
XXXIII 5/1/1998 to 4/30/1999 Kal. Mai. 2751 to pr. Kal. Mai. 2752
XXXIV 5/1/1999 to 4/30/2000 Kal. Mai. 2752 to pr. Kal. Mai. 2753
XXXV 5/1/2000 to 4/30/2001 Kal. Mai. 2753 to pr. Kal. Mai. 2754
XXXVI 5/1/2001 to 4/30/2002 Kal. Mai. 2754 to pr. Kal. Mai. 2755
XXXVII 5/1/2002 to 4/30/2003 Kal. Mai. 2755 to pr. Kal. Mai. 2756
XXXVIII 5/1/2003 to 4/30/2004 Kal. Mai. 2756 to pr. Kal. Mai. 2757
XXXIX 5/1/2004 to 4/30/2005 Kal. Mai. 2757 to pr. Kal. Mai. 2758
XL 5/1/2005 to 4/30/2006 Kal. Mai. 2758 to pr. Kal. Mai. 2759
XLI 5/1/2006 to 4/30/2007 Kal. Mai. 2759 to pr. Kal. Mai. 2760
XLII 5/1/2007 to 4/30/2008 Kal. Mai. 2760 to pr. Kal. Mai. 2761
XLIII 5/1/2008 to 4/30/2009 Kal. Mai. 2761 to pr. Kal. Mai. 2762
XLIV 5/1/2009 to 4/30/2010 Kal. Mai. 2762 to pr. Kal. Mai. 2763
XLV 5/1/2010 to 4/30/2011 Kal. Mai. 2763 to pr. Kal. Mai. 2764
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