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History of the Gregorian Calendar

The Gregorian calendar is the most prevalently used calendar today. Within this calendar, a standard year consists of 365 days with a leap day being introduced to the month of February during a leap year. The months of April, June, September, and November have 30 days, while the rest have 31 days except for February, which has 28 days in a standard year, and 29 in a leap year.

The Gregorian calendar is a reformed version of the Julian calendar, which was itself a modification of the ancient Roman calendar. The ancient Roman calendar was believed to be an observational lunar calendar, based on the cycles of the moon's phases.

U.S. Federal Holidays
2025 Holidays Date 2026 Holidays Date
New Year's Day Jan 1, 2025 New Year's Day Jan 1, 2026
Martin Luther King Jr. Day Jan 20, 2025 Martin Luther King Jr. Day Jan 19, 2026
President's Day Feb 17, 2025 President's Day Feb 16, 2026
Memorial Day May 26, 2025 Memorial Day May 25, 2026
Juneteenth Day Jun 19, 2025 Juneteenth Day Jun 19, 2026
Independence Day Jul 4, 2025 Independence Day Jul 4, 2026
Labor Day Sep 1, 2025 Labor Day Sep 7, 2026
Columbus Day Oct 13, 2025 Columbus Day Oct 12, 2026
Veteran's Day Nov 11, 2025 Veteran's Day Nov 11, 2026
Thanksgiving Nov 27, 2025 Thanksgiving Nov 26, 2026
Christmas Dec 25, 2025 Christmas Dec 25, 2026

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Math Calculators To perform basic calculations, use the basic math calculator or one of the calculators listed below. Scientific Calculator Fraction Calculator Percentage Calculator Random

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