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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2028 Holidays at a Glance
Leap year - 366 days
US federal holidays
- Jan 1: New Year's Day
- Jan 17: Martin Luther King Jr. Day
- Feb 21: Presidents' Day
- May 29: Memorial Day
- Jul 4: Independence Day
- Sep 4: Labor Day
- Oct 9: Columbus Day
- Nov 11: Veterans Day
- Nov 23: 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.
Week Numbers & Days
- •📆 ISO Week 1 Rule: ISO 8601 defines Week 1 as the week containing the first Thursday of January - this means some years (like 2026) have Week 1 starting in the previous year (Jan 5, 2026 is in Week 1).
- •🔢 53-Week Years: Some years have 53 weeks instead of 52 - this happens in leap years starting on Thursday, or common years starting on Thursday (most recently 2020, next: 2026).
- •📅 Business Days Math: The average year has 250-252 business days (weekdays excluding federal holidays) - meaning roughly 48-49% of the year is working days, not the 71% (5/7) you might expect.
- •🌍 Monday vs Sunday Start: Most of the world (Europe, Asia, Australia) starts the week on Monday (ISO standard), while the US, Canada, and parts of Asia start on Sunday - this creates confusion in international calendars.
- •⏰ Wednesday is Middle: Wednesday's name comes from "Woden's day" (Germanic god) - in Romance languages, it's "Mercury's day" (Spanish: miércoles, French: mercredi), both named after messenger gods.
- •📆 Saturday Origins: Saturday is the only English day name derived from Roman mythology (Saturn's day) - the other six come from Germanic/Norse gods (Sun, Moon, Tiw, Woden, Thor, Freya).