Guides
Plain-English explainers on holidays, calendars, time zones and date maths. Every guide is checked against the official rule and links to a tool that does the counting for you.
- Your Life in Weeks: The 4,000-Weeks Idea and How to Read the GridThe arithmetic behind a life in weeks, where the 4,000-weeks idea comes from, how our chart draws and shades your grid, and practical ways to use…
- Life Expectancy Explained: At Birth, at Your Age, and What It MeansWhat life expectancy at birth and at your age mean, how SSA's period life table works, why the figures are averages, and what our calculator can…
- What Day of the Year Is It? Day Numbers and Julian DatesHow day-of-year numbers work, a first-of-month table for common and leap years, YYDDD and ISO ordinal dates, the astronomical Julian Day, and days left.
- What Are Business Days? Meaning, Examples and HolidaysWhat counts as a business day, how to count 3–5 business days from an order date, the holidays that pause banks and USPS, and countries with…
- Best Time to Meet Across Time Zones: Overlap Hours by City PairWorking-hour overlaps for US East/West, US–UK, UK–India and US–Australia, the weeks daylight saving shifts them, and practical tips for scheduling fairly.
- How to Calculate Your Age in Days (and Weeks, Months, Hours)How to work out your age in days by hand or with our calculator, with leap days, weeks, months and hours, birthday edge cases and milestone…
- How Many Days Is 1,000 Hours? Hours to Days Conversion TableDivide hours by 24 to get days: 1,000 hours is 41 days and 16 hours. A conversion table to 10,000 hours, calendar vs. working days, and…
- How Many Days Until Summer 2027? Every Start Date ExplainedWhen summer 2027 starts: the June 21 solstice, meteorological June 1, Memorial Day and school's out, with fixed countdown figures and the Southern Hemisphere.
- Classroom Timer: How to Run a Full-Screen Countdown in ClassHow to put a full-screen countdown on the board: setup, keyboard shortcuts, when the warning color appears, timings for common activities and accessibility tips.
- 30, 60 and 90 Days From Today: How to Count Each DeadlineHow to count 30, 60 and 90 days from today, why 90 days and 3 months differ, calendar vs. business days, and worked examples on fixed…
- When Is Winter Break 2026? School District Dates and How Long It LastsWinter break 2026 dates from official district calendars for NYC, Los Angeles, Chicago, Houston and Miami-Dade, how college breaks differ, and how to plan.
- When Is Thanksgiving 2026? Date, Long Weekend and What’s ClosedThanksgiving 2026 falls on Thursday, November 26. The fourth-Thursday rule, the Friday-off question, closures and market hours, and dates through 2030.
- When Is the Super Bowl 2027? Date, Venue and the Valentine’s Day ClashSuper Bowl LXI is set for Sunday, February 14, 2027, at SoFi Stadium. Why the game falls in mid-February, kickoff time, the Valentine's Day overlap and…
- Printable Calendar 2027: Year or Month Pages, Sunday or Monday StartHow to print our free 2027 calendar as a one-page year or monthly pages, with a Sunday or Monday start, plus 2027 facts: Friday start, 52…
- Orthodox Christmas 2027: Thursday, January 7, and Why the Date DiffersOrthodox Christmas 2027 falls on Thursday, January 7. Why the Julian date differs, which churches keep it, where it is a public holiday, and Orthodox New…
- New Year’s Resolutions 2027: Start Dates, Quitter’s Day, CheckpointsPlan New Year's resolutions 2027 by date: the Friday start, the first full week, Quitter's Day on January 8, quarterly checkpoints and week-by-week tracking.
- When Is Boxing Day 2026? Date and Substitute Holidays by CountryBoxing Day 2026 falls on Saturday, December 26, so the UK, Australia and New Zealand get Monday, December 28 off. Canada's rules, the US and dates…
- Valentine’s Day 2027: Sunday Date and the Presidents’ Day WeekendValentine's Day 2027 falls on Sunday, February 14, right before Presidents' Day. Here's the long weekend, other February dates and a short history.
- St. Patrick’s Day 2027: Date, Holiday Status and ParadesSt. Patrick's Day 2027 falls on Wednesday, March 17, during Lent. Here's where it's a holiday, how parades are scheduled and when the church moves the…
- When Is Mardi Gras 2027? Date, Carnival Season and Holiday StatusMardi Gras 2027 falls on Tuesday, February 9, the day before Ash Wednesday. Here's how the date is set, Carnival season and where it's a holiday.
- When Does Lent Start in 2027? Ash Wednesday to Easter DatesLent 2027 runs from Ash Wednesday, February 10, to Holy Thursday, March 25. Here's how the 40 days are counted, the Fridays, and Orthodox Great Lent.
- Holiday Calendar 2026: Every Date From Halloween to New Year’s DayEvery key date of the 2026 holiday season in one table, from Halloween to New Year's Day 2027, with weekdays, countdowns and which days are federal…
- When Is Halloween 2026? Date, Trick-or-Treat Times and the Clock ChangeHalloween 2026 falls on Saturday, October 31. Whether anything closes, how trick-or-treat hours are set, the clock change the next morning, and dates through 2030.
- Groundhog Day 2027: Date, Origins and How Accurate Phil IsGroundhog Day 2027 falls on Tuesday, February 2. Here's the Candlemas origin, the 1887 Punxsutawney start and how often Phil's forecast is right.
- When Is Diwali 2026? Lakshmi Puja Date and All the Festival DaysDiwali 2026 falls on Sunday, November 8. Each festival day from Dhanteras to Bhai Dooj, why 2026 has a gap day, public holiday status and dates…
- When Is Day of the Dead 2026? Día de los Muertos Dates and MeaningDía de los Muertos 2026 falls on Sunday, November 1 and Monday, November 2. What each day honors, how to build an ofrenda, its UNESCO status…
- What Day Is Christmas 2026? Date, Long Weekend and Observed RulesChristmas 2026 falls on Friday, December 25. What's closed, how to stretch the long weekend, the weekend observed rules, dates through 2030 and Orthodox Christmas.
- How Many Working Days in 2027? Month-by-Month Count2027 has 261 weekdays and 249 federal working days. The count by month and quarter, comparisons with 2026 and 2028, and how to adjust it for…
- Winter Solstice 2026: Exact Time, Shortest Day and Why the Date ShiftsThe 2026 winter solstice is December 21 at 3:50 p.m. EST. Exact times by zone, why the date moves, the earliest-sunset puzzle and the Southern Hemisphere…
- Why Is Thanksgiving on a Thursday? The History Behind the DateA 1941 law set Thanksgiving on the fourth Thursday in November, after Roosevelt's 1939 date change split the country. History, dates and the four-day weekend.
- What Generation Am I? Generations by Birth YearFind your generation by birth year using Pew Research Center's ranges, from the Silent Generation to Gen Z, plus what's known about Generation Alpha.
- Is Veterans Day a Federal Holiday? Veterans Day 2026 GuideVeterans Day 2026 is Wednesday, November 11. Why it keeps a fixed date, the 1971–1977 Monday experiment, what's open and closed, and how it differs from…
- UTC vs GMT: What’s the Difference, and Which Should You Use?UTC is the world's atomic time standard; GMT is the UK's winter time zone. How BST fits in, converting UTC to US zones, and Zulu time.
- When Do the 12 Days of Christmas Start? 2026–27 DatesThe twelve days run from Christmas Day, December 25, 2026, to January 5, 2027, ending with Twelfth Night and Epiphany. Every day, the counting debate and…
- When Are Taxes Due in 2027? Tax Day, Extensions and Key DatesFederal tax returns for 2026 are due Thursday, April 15, 2027. Here's how extensions, estimated payments and the weekend and holiday rule work.
- Stock Market Holidays 2027: NYSE and Nasdaq ClosuresEvery NYSE closure and early close in 2027, from the published calendar, with trading days by month and how market holidays differ from federal and bank…
- Shoe Size Conversion Explained: US, UK, EU, cm and MondopointHow US, UK, EU, centimeter and Mondopoint shoe sizes are built, a reference chart, why brands differ, and how to measure your feet.
- First Day of Spring 2027 and Every Equinox and SolsticeExact 2027 equinox and solstice times in Eastern, Pacific and UTC, astronomical vs meteorological seasons, and why the dates shift each year.
- When Is Ramadan 2027? Expected Dates and Eid al-FitrRamadan 2027 is expected to start on Monday, February 8, and end with Eid al-Fitr on March 9 or 10, depending on the moon sighting.
- Presidents’ Day 2027: Date, Official Name and What’s ClosedPresidents' Day 2027 falls on Monday, February 15, the earliest date possible. Here's the official name, the 1968 Monday law and what's closed.
- The Pomodoro Technique: Rules, Origins and How to Use ItFrancesco Cirillo's method in plain English: 25-minute focus blocks, short breaks, a long break after four, handling interruptions, and variations.
- How Many Pay Periods in 2027? 26 or 27 Biweekly PaydaysPay periods in 2027 for weekly, biweekly, semi-monthly and monthly pay, why 2027 has a 27-payday schedule, the months with three paychecks and holiday paydays.
- Is New Year’s Eve a Holiday? New Year’s 2026–27 GuideNew Year's Eve isn't a federal holiday, but New Year's Day 2027 is. What's open on each day, the markets, and why Friday, December 31, 2027…
- MLK Day 2027: Date, What’s Closed and History of the HolidayMartin Luther King Jr. Day 2027 falls on Monday, January 18. Here's what closes, how the date rule works, and how the holiday became law.
- Minutes to Decimal Hours: Formula, 1–60 Chart and Rounding RulesDivide the minutes by 60. A full 1–60 minute chart, quarter-hour and tenth-hour rounding, and how to avoid rounding errors on timesheets.
- Military Time Chart: How to Read, Convert and Say 24-Hour TimeA full military time chart with the rules for converting either way, how to say the times out loud, midnight as 0000 or 2400, and Zulu…
- Memorial Day 2027: Date, History and What’s OpenMemorial Day 2027 falls on Monday, May 31. Here's the last-Monday rule, what's open and closed, the holiday's history and the long weekend.
- Long Weekends 2027: Every Three- and Four-Day WeekendEvery federal three-day weekend in 2027, the one-day additions that make four-day breaks, December's back-to-back long weekends and the months with no holiday.
- When Is the Next Leap Year? Leap Years ExplainedThe next leap day is Tuesday, February 29, 2028. How the Gregorian 4/100/400 rule works, why it exists, and what a leap year changes for birthdays…
- Labor Day 2027: Date, History and What’s ClosedLabor Day 2027 falls on Monday, September 6. Here's the first-Monday rule, what closes, how the holiday began and when Labor Day weekend runs.
- When Is Kwanzaa? Dates and the Seven Principles by DayKwanzaa runs from December 26 to January 1 every year. The 2026–27 dates, each day's principle of the Nguzo Saba, the seven symbols and how the…
- Is Juneteenth a Federal Holiday? Dates, History and ClosuresJuneteenth became a federal holiday in 2021. See the 2026 and 2027 dates, why many banks stay open on June 18, 2027, and the history behind…
- July 4th 2027 Observed: Why the Holiday Is Monday, July 5Independence Day 2027 falls on a Sunday, so the federal holiday moves to Monday, July 5. Here's what closes and how the observed-day rules work.
- What Week Number Is It? ISO Week Numbers ExplainedHow ISO 8601 week numbers work, why January 1 can fall in week 53, which years have 53 weeks, and how ISO and US week numbers…
- Is Christmas Eve a Federal Holiday? Christmas Eve 2026 ExplainedChristmas Eve isn't a federal holiday, but executive orders and weekend rules sometimes make it a day off. Recent orders, the 2027 quirk, and what's open…
- How to Calculate Days Between Dates (Inclusive or Not)How to count the days between two dates by hand or in Excel, when to include the end date, month lengths, business days and checked examples.
- How to Calculate Hours Worked: Breaks, Night Shifts and Weekly TotalsSubtract the start time from the end time, then take off unpaid breaks. Worked examples for overnight shifts, decimal hours, weekly totals and overtime.
- How Many Weeks Are in a Year? 52, Plus a Day or TwoEvery year is 52 weeks plus a day or two. Here's which weekday gets the extra day, which years have 53 ISO weeks and how that…
- When Is Hanukkah 2026? Dates, Candle Schedule and Why It MovesHanukkah 2026 starts at sundown on Friday, December 4. The eight-night candle schedule, what the festival marks, why its date moves, and dates through 2030.
- Full Moon 2027: Every Date, Time and Traditional NameEvery full moon of 2027 with its US Eastern and UTC time, what the traditional names mean, why the Harvest Moon is in September and the…
- What Quarter Are We In? Calendar and Fiscal Quarters ExplainedCalendar quarters, fiscal quarters and the federal October 1 fiscal year, with quarter-end dates and working days for 2026 and 2027.
- Federal Holidays 2028: All 11 Dates and Observed DaysAll 11 federal holidays in 2028 with observed days, long weekends, the leap year, Election Day and the 2029 inauguration, plus how banks and markets differ.
- How to Add Days to a Date in Excel, Plus Every Key Date FormulaAdd days, months and working days to dates in Excel with plain arithmetic, DATE, EDATE, EOMONTH, WORKDAY, NETWORKDAYS and DATEDIF, all with checked results.
- EST vs EDT: US Time Zones, Abbreviations and Switch DatesEST is Eastern Standard Time (UTC−5) and EDT is Eastern Daylight Time (UTC−4). Every US zone, the 2026–2028 switch dates, Arizona and Hawaii.
- When Is Election Day 2026? Date, Rules and Whether It’s a HolidayElection Day 2026 is Tuesday, November 3. Why federal elections fall on the Tuesday after the first Monday in November, upcoming dates, and holiday rules.
- When Is Easter 2027? Date, Holy Week and Orthodox EasterEaster 2027 falls on Sunday, March 28, and Orthodox Easter on May 2. Here's how the date is set, plus Holy Week, Lent and what's open…
- When Is Diwali 2027? Dates for All Five DaysDiwali 2027 falls on Friday, October 29. Here are the five festival days, why the date moves every year and Diwali dates from 2026 to 2030.
- What Day of the Week Was I Born? Find the Weekday for Any DateWork out the day of the week for any date, including your birthday, with the Doomsday method, five checked examples and Excel's TEXT and WEEKDAY functions.
- Free Countdown Widget for Your Website: How to Embed ItCopy one line of iframe code to put a live holiday countdown on your site. Size and color options, where to paste it, accessibility and privacy.
- Is Columbus Day a Federal Holiday? And Indigenous Peoples’ DayColumbus Day is a federal holiday on Monday, October 12, 2026. Here's how it became law, where Indigenous Peoples' Day replaces it, and what's open.
- Chinese Zodiac Years Chart: Animals and Elements, 1960–2031Every Chinese zodiac year from 1960 to 2031 with its animal and element, how the 60-year cycle works, and why January and February birthdays need a…
- Chinese New Year 2027: February 6 and the Year of the Fire GoatChinese New Year 2027 falls on Saturday, February 6. See the festival dates, why the lunar date moves each year, and holidays across Asia.
- Canadian Thanksgiving 2026: Date, History and Stat Holiday RulesCanadian Thanksgiving 2026 is Monday, October 12. Dates through 2030, why it's in October, where it's a statutory holiday, and how it compares with US Thanksgiving.
- When Is Black Friday 2026? Black Friday and Cyber Monday DatesBlack Friday 2026 is November 27 and Cyber Monday is November 30. How the dates are set, where the names come from, what's open, and a…
- Best Days to Take Off in 2027: How to Maximize Your PTOThe bridge days that stretch 2027's holidays furthest: 4 days of leave for 10 off at year-end, 10 for 18 in June or November, plus plans…
- Bank Holidays 2027: Federal Reserve Schedule and DatesThe Federal Reserve's 2027 holiday schedule, the Saturday rule that keeps banks open when federal offices close, payments on holidays, and the UK bank holidays.
- When Does Advent Start in 2026? Advent Sundays and Calendar DatesAdvent 2026 begins Sunday, November 29. The four Sundays, the week-by-week schedule, dates through 2030, and why Advent calendars start on December 1.
- US Federal Holidays 2027: Dates and Observed DaysAll 11 US federal holidays in 2027 with their weekdays and observed dates, the ten three-day weekends, and how the Saturday and Sunday rule works.
- Daylight Saving Time 2026–2027: When the Clocks ChangeDaylight saving time ends November 1, 2026 and starts March 14, 2027. See every US date through 2030, who doesn’t change the clocks, and how the…
How we check our guides
Dates come from the same engine that powers every tool, and each rule is traced to its official source: federal law for holidays, the IANA time zone database for clocks, and published calendars for lunar holidays. See our sources and our editorial and corrections policy.
Popular tools
- Days untilCount the days to any date or holiday.
- Weeks untilWeeks and days left until a date.
- What holiday is today?Today's holidays, national days and observances, in your time zone.
- Months untilWhole calendar months plus days to a date.
- Weekends untilHow many weekends are left before a date.
- Sleeps untilA countdown in nights — great for kids.
- Fortnights untilCount down in two-week periods.
- All countdownsEvery holiday countdown in one list.