Calendar tools · holidays · how-tos
Free calendar tools and holiday dates that just work.
Quick answers for everyday calendar questions: week numbers, business days, holiday dates, sports and finance schedules, and step-by-step guides for Google Calendar, Outlook, and Apple Calendar.
Most-used tools
All client-side. Inputs never leave your browser.
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Week Number
What ISO week is today? Look up any date.
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Days Between Dates
Calendar days, business days, weeks, months.
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Date Calculator
Add or subtract days, weeks, months, years.
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Age Calculator
Exact age in years, months, days, hours.
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Countdown
Days until Christmas, New Year, and more.
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Week Numbers
Full ISO week tables for 2025–2028.
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Most-read guides
The pages readers come back to most.
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NFL schedule in your calendar
Subscribe to your team's iCal feed in Google, Apple, or Outlook. Bye weeks and time zones explained.
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Hide weekends in Google Calendar
Settings → View options → untick Show weekends. Desktop, Android, iPhone.
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Persian calendar 2026
Solar Hijri 1404–1405: Nowruz, month starts, conversion to Gregorian.
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Age calculator
Exact age in years, months, and days from any date of birth.
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Islamic calendar 2026
Hijri 1447–1448: Ramadan, Eid, month starts mapped to Gregorian dates.
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Recurring events in Google Calendar
Every other Tuesday, last Friday of the month, and how to edit one occurrence.
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Explore the site
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Holidays & Observances
US federal holidays, monthly observances, 50 states, 30 countries.
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Calendar How-To Guides
27 tutorials for Google Calendar, Outlook, and Apple Calendar.
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Sports Schedules in Your Calendar
Subscribe to NFL, NBA, MLB, NHL, MLS, Premier League, La Liga, Champions League, F1 and club feeds.
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Financial Calendars
Economic data, FOMC, earnings season, tax deadlines, market holidays.
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Cultural Calendars
Lunar, Islamic, Hebrew, Chinese, Hindu, Buddhist, Persian, Ethiopian, Coptic, Japanese — 2026 and 2027.
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Smart-Calendar Reviews
Skylight, Echo Show, Hearth — hands-on family-display reviews.
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Quick jump
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US Holidays 2026
Federal holidays this year.
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Holidays by State
All 50 US states.
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Holidays by Country
30 countries worldwide.
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FOMC 2026
Fed rate-decision dates.
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Ramadan & Eid 2027
Islamic calendar 1448–1449 with every month start.
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Nowruz 2027
Persian calendar 1405–1406, holidays, conversion.
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What's on this site?
The Calendar covers six things calendar users actually search for:
- Quick tools — week numbers, date math, age, and countdowns. No sign-up.
- Holiday data — US federal, by state, by country, by month. With observed-day rules.
- How-to guides — plain-English instructions for Google, Outlook, and Apple Calendar.
- Sports schedules — how to subscribe to official league and club feeds so game times update themselves.
- Finance calendars — FOMC dates, economic releases, earnings, taxes.
- Cultural calendars — Lunar, Islamic, Hebrew, Chinese, Hindu, Buddhist, Persian, Ethiopian, Coptic, Japanese.
Everything is free, factual, and runs in your browser. Tools never send your inputs anywhere — calculations are 100% client-side.