Calendar
Yearly calendar with all months at a glance - holidays and moon phases
January
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February
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March
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April
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May
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June
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July
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August
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September
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October
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November
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December
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2026 Holidays at a Glance
Common year - 365 days
US federal holidays
- Jan 1: New Year's Day
- Jan 19: Martin Luther King Jr. Day
- Feb 16: Presidents' Day
- May 25: Memorial Day
- Jul 4: Independence Day
- Sep 7: Labor Day
- Oct 12: Columbus Day
- Nov 11: Veterans Day
- Nov 26: Thanksgiving
- Dec 25: Christmas Day
🎉 Fun Facts
- •📅 Friday the 13th Frequency: Every calendar year has at least one Friday the 13th, and at most three - the longest possible gap between Friday the 13ths is 14 months (426 days), and any month starting on a Sunday will have a Friday the 13th.
- •🗓️ The Calendar Repeat Cycle: There are only 14 possible calendar configurations (7 for common years starting on each day of the week, 7 for leap years) - meaning every year is identical to some past year, and 2026's calendar is exactly the same as 1999, 2010, and will repeat in 2037.
- •⏰ The Lost 11 Days: When Britain switched from the Julian to Gregorian calendar in September 1752, they skipped 11 days - going directly from September 2 to September 14 - causing riots from people who believed their lives were being "shortened."
- •🌍 New Year's Not Universal: While most of the world celebrates January 1, the Chinese New Year (Jan 21-Feb 20), Islamic New Year (moves 11 days earlier each year), Jewish New Year (Rosh Hashanah, Sept/Oct), and Ethiopian New Year (Sept 11) all fall on completely different dates.
- •📊 October/December Name Paradox: October means "8th month" and December means "10th month" in Latin, but they're the 10th and 12th months - this happened because the Roman calendar originally started in March, making October the 8th and December the 10th until January and February were added later.
Date Mathematics & Patterns
- •📊 Doomsday Algorithm: Mathematician John Conway created the "Doomsday Algorithm" - memorize that 4/4, 6/6, 8/8, 10/10, 12/12 always fall on the same day of the week each year, letting you calculate any date mentally.
- •🔢 Zeller's Congruence: Zeller's formula calculates the day of the week for any date using only arithmetic - input month, day, year, and the formula outputs a number 0-6 representing Sun-Sat.
- •📅 Calendar Repeats: A calendar year repeats after 6 or 11 years for common years, and 28 years for leap years - but the full 400-year cycle ensures every possible date-day combination eventually occurs.
- •🎂 Birthday Paradox: In a group of just 23 people, there's a 50% chance two share a birthday - at 70 people, it's 99.9%, defying most people's intuition about probability.
- •📆 Same Birthday Couples: The odds of a couple sharing the exact same birthday (day and year) are about 1 in 133,000 - yet celebrity couples like Michael Jordan & Scottie Pippen (both Feb 17, 1963) exist.
- •🔢 Century Calculation Trick: To find which centuries started on which day: 1900 started on Monday, 2000 on Saturday, 2100 on Friday - each century shifts by 5 days due to the 100-year leap year rule.