Anno Domini is used in the Western calendar to number years after the birth of Jesus Christ. In which calendar system is this numbering primarily used?

• A. Eastern calendar
• B. Islamic calendar
• C. Western calendar
• D. Jewish calendar

Answer: (C)

Anno Domini marks years in the Western calendar, tying the count to the traditional birth of Jesus Christ. This dating system is built into the Gregorian calendar, which became the standard civil calendar in Europe and was carried worldwide. Other calendars start their years from different events—such as the Islamic calendar from the Hijra, the Jewish calendar from Creation (Anno Mundi), or various East Asian era systems—so they don’t use the AD numbering. That makes the Western calendar the primary context where this labeling appears. In modern usage, CE (Common Era) is often used instead of AD, but the year numbers align with the same dating system.