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Photo Courtesy: AJ_Watt/Getty Images Many people use calendars to track their day-to-day activities or to plan important events. We rely on calendars to record dates and appointments. We use them to know which years have 365 days or 366. Each year is different when it comes to the days of the week and dates matching up, and without our calenders, we’d likely have a difficult time keeping track of this information.

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But did you know that, just because the years are different, it doesn’t mean calendars have never repeated themselves? There are times when the precise sequence of one calendar year repeats in the future. Because of this, it’s possible to reuse calendars, even though you might have to wait a few years. But what calendar do we use, and how often does the calendar repeat? Is this going to happen anytime soon? Let’s find out.

Repeating Calendar Years

Calendars don’t repeat all the time. It isn’t even an annual occurrence, but it has happened more often throughout history than most people probably realize. Essentially, every calendar year has been repeated. For example, looking at 2021, the calendar year is the same as 2010, 1999, 1993, 1982, 1971, 1965, 1954, 1943, 1937, 1926, 1915 and 1909.

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To continue, 2018 was a repeat of 2007, 2001, 1990, 1979, 1973, 1962, 1951, 1945, 1934, 1923, 1917, 1909 and 1900. The year 2012 (which sparked a discussion about the Mayan “doomsday” calendar) was the same calendar year as 1984, 1956 and 1928. The year 2005 was a repeat of 1994, 1983, 1977, 1966, 1955, 1949, 1938, 1927, 1921, 1910, 1898 and 1887. Finally, the year 2000 was a repeat of 1972, 1944, and 1916.

Even though the calendar years have repeated themselves, there are vast differences in the cultures, trends, politics and technology that were present during these years. The 1930s were much different from the 1990s, and even the 2000s were much different from the 2020s. The calendars might not have changed, but the lifestyles have — making this an interesting study for historians.

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What Calendar Do We Use?

If you live in the United States, you use the Gregorian calendar. This is the standard calendar used in most countries across the globe, including Spain, France, Poland, Italy, Germany, Ireland, Greece, Sweden, Egypt, Japan, China and others. You use the Gregorian calendar every day, but you might not even realize how it works or that it has some specific rules and patterns.