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2400 (MMCD) will be a century leap year starting on Saturday of the Gregorian calendar, the 2400th year of the Common Era (CE) and Anno Domini (AD) designations, the 400th year of the 3rd millennium, the 100th and last year of the 24th century, and the 1st year of the 2400s decade.
2100 (MMC) will be an exceptional common year starting on Friday of the Gregorian calendar, the 2100th year of the Common Era (CE) and Anno Domini (AD) designations, the 100th year of the 3rd millennium, the 100th and last year of the 21st century, and the 1st year of the 2100s decade.
2025 (MMXXV) will be a common year starting on Wednesday of the Gregorian calendar, the 2025th year of the Common Era (CE) and Anno Domini (AD) designations, the 25th year of the 3rd millennium and the 21st century, and the 6th year of the 2020s decade.
2024 (MMXXIV) is the current year, and is a leap year starting on Monday of the Gregorian calendar, the 2024th year of the Common Era (CE) and Anno Domini (AD) designations, the 24th year of the 3rd millennium and the 21st century, and the 5th year of the 2020s decade.
2023 (MMXXIII) was a common year starting on Sunday of the Gregorian calendar, the 2023rd year of the Common Era (CE) and Anno Domini (AD) designations, the 23rd year of the 3rd millennium and the 21st century, and the 4th year of the 2020s decade.
2000 (MM) was a century leap year starting on Saturday of the Gregorian calendar, the 2000th year of the Common Era (CE) and Anno Domini (AD) designations, the 1000th and last year of the 2nd millennium, the 100th and last year of the 20th century, and the 1st year of the 2000s decade.
1930 (MCMXXX) was a common year starting on Wednesday of the Gregorian calendar, the 1930th year of the Common Era (CE) and Anno Domini (AD) designations, the 930th year of the 2nd millennium, the 30th year of the 20th century, and the 1st year of the 1930s decade.
1929 (MCMXXIX) was a common year starting on Tuesday of the Gregorian calendar, the 1929th year of the Common Era (CE) and Anno Domini (AD) designations, the 929th year of the 2nd millennium, the 29th year of the 20th century, and the 10th and last year of the 1920s decade.
1928 (MCMXXVIII) was a leap year starting on Sunday of the Gregorian calendar, the 1928th year of the Common Era (CE) and Anno Domini (AD) designations, the 928th year of the 2nd millennium, the 28th year of the 20th century, and the 9th year of the 1920s decade.
1900 (MCM) was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the start of 1900, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
1600 (MDC) was a century leap year starting on Saturday of the Gregorian calendar and a leap year starting on Tuesday of the Julian calendar, the 1600th year of the Common Era (CE) and Anno Domini (AD) designations, the 600th year of the 2nd millennium, the 100th and last year of the 16th century, and the 1st year of the 1600s decade. As of the start of 1600, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
1583 (MDLXXXIII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1583rd year of the Common Era (CE) and Anno Domini (AD) designations, the 583rd year of the 2nd millennium, the 83rd year of the 16th century, and the 4th year of the 1580s decade. As of the start of 1583, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
1582 (MDLXXXII) was a common year starting on Monday of the Julian calendar, the 1582nd year of the Common Era (CE) and Anno Domini (AD) designations, the 582nd year of the 2nd millennium, the 82nd year of the 16th century, and the 3rd year of the 1580s decade. As of the start of 1582, the Gregorian calendar was 10 days ahead of the Julian calendar, which had previously been the universally accepted calendar in Christian nations. However, this year saw the beginning of the Gregorian Calendar switch, when the Papal bull known as Inter gravissimas introduced the Gregorian calendar, adopted by Spain, Portugal, the Polish–Lithuanian Commonwealth and most of present-day Italy from the start. In these countries, the year continued as normal until Thursday, October 4. However, the next day became Friday, October 15 (like a common year starting on Friday), in those countries (France followed two months later, letting Sunday, December 9 be followed by Monday, December 20). Other countries continued using the Julian calendar for decades or, in some cases, centuries.
1581 (MDLXXXI) was a common year starting on Sunday of the Julian calendar, the 1581st year of the Common Era (CE) and Anno Domini (AD) designations, the 581st year of the 2nd millennium, the 81st year of the 16th century, and the 2nd year of the 1580s decade. As of the start of 1581, the Gregorian calendar was 10 days ahead of the Julian calendar, which was the dominant calendar of the time.

Actual

2400 (MMCD) will be a century leap year starting on Saturday of the Gregorian calendar, the 2400th year of the Common Era (CE) and Anno Domini (AD) designations, the 400th year of the 3rd millennium, the 100th and last year of the 24th century, and the 1st year of the 2400s decade.
2100 (MMC) will be an exceptional common year starting on Friday of the Gregorian calendar, the 2100th year of the Common Era (CE) and Anno Domini (AD) designations, the 100th year of the 3rd millennium, the 100th and last year of the 21st century, and the 1st year of the 2100s decade.
2025 (MMXXV) will be a common year starting on Wednesday of the Gregorian calendar, the 2025th year of the Common Era (CE) and Anno Domini (AD) designations, the 25th year of the 3rd millennium and the 21st century, and the 6th year of the 2020s decade.
2024 (MMXXIV) is the current year, and is a leap year starting on Monday of the Gregorian calendar, the 2024th year of the Common Era (CE) and Anno Domini (AD) designations, the 24th year of the 3rd millennium and the 21st century, and the 5th year of the 2020s decade.
2023 (MMXXIII) was a common year starting on Sunday of the Gregorian calendar, the 2023rd year of the Common Era (CE) and Anno Domini (AD) designations, the 23rd year of the 3rd millennium and the 21st century, and the 4th year of the 2020s decade.
2000 (MM) was a century leap year starting on Saturday of the Gregorian calendar, the 2000th year of the Common Era (CE) and Anno Domini (AD) designations, the 1000th and last year of the 2nd millennium, the 100th and last year of the 20th century, and the 1st year of the 2000s decade.
1930 (MCMXXX) was a common year starting on Wednesday of the Gregorian calendar, the 1930th year of the Common Era (CE) and Anno Domini (AD) designations, the 930th year of the 2nd millennium, the 30th year of the 20th century, and the 1st year of the 1930s decade.
1929 (MCMXXIX) was a common year starting on Tuesday of the Gregorian calendar, the 1929th year of the Common Era (CE) and Anno Domini (AD) designations, the 929th year of the 2nd millennium, the 29th year of the 20th century, and the 10th and last year of the 1920s decade.
1928 (MCMXXVIII) was a leap year starting on Sunday of the Gregorian calendar, the 1928th year of the Common Era (CE) and Anno Domini (AD) designations, the 928th year of the 2nd millennium, the 28th year of the 20th century, and the 9th year of the 1920s decade.
1900 (MCM) was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the start of 1900, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
1600 (MDC) was a century leap year starting on Saturday of the Gregorian calendar and a leap year starting on Tuesday of the Julian calendar, the 1600th year of the Common Era (CE) and Anno Domini (AD) designations, the 600th year of the 2nd millennium, the 100th and last year of the 16th century, and the 1st year of the 1600s decade. As of the start of 1600, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
1583 (MDLXXXIII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1583rd year of the Common Era (CE) and Anno Domini (AD) designations, the 583rd year of the 2nd millennium, the 83rd year of the 16th century, and the 4th year of the 1580s decade. As of the start of 1583, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
1582 (MDLXXXII) was a common year starting on Monday of the Julian calendar, the 1582nd year of the Common Era (CE) and Anno Domini (AD) designations, the 582nd year of the 2nd millennium, the 82nd year of the 16th century, and the 3rd year of the 1580s decade. As of the start of 1582, the Gregorian calendar was 10 days ahead of the Julian calendar, which had previously been the universally accepted calendar in Christian nations. However, this year saw the beginning of the Gregorian Calendar switch, when the Papal bull known as Inter gravissimas introduced the Gregorian calendar, adopted by Spain, Portugal, the Polish–Lithuanian Commonwealth and most of present-day Italy from the start. In these countries, the year continued as normal until Thursday, October 4. However, the next day became Friday, October 15 (like a common year starting on Friday), in those countries (France followed two months later, letting Sunday, December 9 be followed by Monday, December 20). Other countries continued using the Julian calendar for decades or, in some cases, centuries.
1581 (MDLXXXI) was a common year starting on Sunday of the Julian calendar, the 1581st year of the Common Era (CE) and Anno Domini (AD) designations, the 581st year of the 2nd millennium, the 81st year of the 16th century, and the 2nd year of the 1580s decade. As of the start of 1581, the Gregorian calendar was 10 days ahead of the Julian calendar, which was the dominant calendar of the time.