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2027 Calendar
with week numbers & holidays.

What week is it today?

2027 calendar with ISO week numbers — USA

January 2027United States

January 2027 calendar for United States with ISO week numbers and holidays
WkMonTueWedThuFriSatSun
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Federal holidayRegionalSubstitute day offReligious / culturalObservanceClock changeSchool / holiday periodISO week

United States holidays 2027 — dates & week numbers

Full USA 2027 pageMarkdownJSON

Clock changes 2027: Clocks go forward 1 hour at 2:00 a.m. on Sunday, March 14, 2027 and back 1 hour at 2:00 a.m. on Sunday, November 7, 2027 (not in Hawaii and most of Arizona).

United States holidays and observances 2027
NameDateWeekdayWeekDay offTypeWhere
New Year's DayFirst day of the Gregorian calendar year.Friday53Same dayFederal holidayNationwide
Martin Luther King Jr. DayThird Monday of January, honoring civil rights leader Martin Luther King Jr.Monday3Same dayFederal holidayNationwide
Groundhog DayPunxsutawney Phil predicts whether spring comes early.Tuesday5—ObservanceNationwide
Lunar New YearYear of the Goat begins.Saturday5—Religious / culturalNationwide
Ramadan beginsApproximate; depends on moon sighting.Monday6—Religious / culturalNationwide
Mardi GrasFat Tuesday, the day before Ash Wednesday; a public holiday in parts of Louisiana.Tuesday6—ObservanceNationwide
Ash WednesdayStart of Lent in Western Christianity.Wednesday6—Religious / culturalNationwide
Valentine's DayCelebration of love and affection.Sunday6—ObservanceNationwide
Presidents' DayWashington's Birthday, the third Monday of February.Monday7Same dayFederal holidayNationwide
Spring break seasonMost schools and colleges take one week off in this window; exact week varies by district. – Monday10—School & holiday periodNationwide
Eid al-FitrEnd of Ramadan. Approximate; depends on moon sighting.Wednesday10—Religious / culturalNationwide
Daylight saving time startsClocks go forward 1 hour at 2:00 a.m. local time (spring forward).Sunday10—Clock changeNationwide
St. Patrick's DayCelebration of Irish heritage with parades nationwide.Wednesday11—ObservanceNationwide
Good FridayCommemorates the crucifixion of Jesus. Public holiday in some states, stock markets closed.Friday12—Religious / culturalNationwide
Easter SundayChristian holiday celebrating the resurrection of Jesus.Sunday12—Religious / culturalNationwide
April Fools' DayDay of pranks and hoaxes.Thursday13—ObservanceNationwide
Tax DayUsual deadline for filing federal income tax returns.Thursday15—ObservanceNationwide
Passover beginsFirst day of Passover (begins at sundown the evening before).Thursday16—Religious / culturalNationwide
Earth DayGlobal day of environmental awareness.Thursday16—ObservanceNationwide
Cinco de MayoCelebration of Mexican-American culture.Wednesday18—ObservanceNationwide
Mother's DaySecond Sunday of May.Sunday18—ObservanceNationwide
Eid al-AdhaFestival of Sacrifice. Approximate; depends on moon sighting.Monday20—Religious / culturalNationwide
Memorial DayLast Monday of May, honoring military personnel who died in service.Monday22Same dayFederal holidayNationwide
Summer vacation (typical)Typical K-12 summer break; varies by state and district. – Monday23—School & holiday periodNationwide
Flag DayCommemorates the adoption of the US flag in 1777.Monday24—ObservanceNationwide
JuneteenthNational Independence Day marking the end of slavery in the United States.Saturday24Federal holidayNationwide
Father's DayThird Sunday of June.Sunday24—ObservanceNationwide
Independence DayCelebrates the Declaration of Independence of 1776.Sunday26Federal holidayNationwide
Labor DayFirst Monday of September, honoring the American labor movement.Monday36Same dayFederal holidayNationwide
Patriot DayRemembrance of the September 11, 2001 attacks.Saturday36—ObservanceNationwide
Grandparents DayFirst Sunday after Labor Day.Sunday36—ObservanceNationwide
Constitution DayMarks the signing of the US Constitution in 1787.Friday37—ObservanceNationwide
Rosh HashanahJewish New Year 5788 (begins at sundown the evening before).Saturday39—Religious / culturalNationwide
Columbus Day / Indigenous Peoples' DaySecond Monday of October. Many states and cities observe it as Indigenous Peoples' Day.Monday41Same dayFederal holidayNationwide
Yom KippurDay of Atonement (begins at sundown the evening before).Monday41—Religious / culturalNationwide
DiwaliHindu festival of lights.Friday43—Religious / culturalNationwide
HalloweenCostumes and trick-or-treating.Sunday43—ObservanceNationwide
Daylight saving time endsClocks go back 1 hour at 2:00 a.m. local time (fall back).Sunday44—Clock changeNationwide
Veterans DayHonors military veterans of the United States Armed Forces.Thursday45Same dayFederal holidayNationwide
Thanksgiving DayFourth Thursday of November.Thursday47Same dayFederal holidayNationwide
Black FridayDay after Thanksgiving; start of the holiday shopping season. Many state employees get the day off.Friday47—ObservanceNationwide
Cyber MondayOnline shopping day after Thanksgiving weekend.Monday48—ObservanceNationwide
Winter break (typical)Typical school winter break, usually continuing into early January. – Monday51—School & holiday periodNationwide
Christmas EveEvening before Christmas Day.Friday51—ObservanceNationwide
Christmas DayChristian holiday celebrating the birth of Jesus.Saturday51Federal holidayNationwide
Hanukkah beginsFirst day of Hanukkah; first candle lit at sundown on December 24.Saturday51—Religious / culturalNationwide
Kwanzaa beginsWeek-long celebration of African-American culture (Dec 26 – Jan 1).Sunday51—ObservanceNationwide
New Year's EveLast day of the year.Friday52—ObservanceNationwide

Islamic, Hindu, Jewish and Chinese calendar dates follow the lunar calendar and may shift by a day with moon sighting. School holiday periods are typical dates and vary by region.

2027 week numbers and dates

Find the start and end dates for every ISO week in 2027. Each week runs from Monday to Sunday, including every date between the two. Week 1 is the week containing the year's first Thursday.

For 2027, January 1–3 belong to week 53 of 2026. Week 1 of 2027 starts on January 4, 2027. 2027 has 52 ISO weeks, and week 52 runs from December 27, 2027 to January 2, 2028.

ISO week numbers 2027: Monday start dates and Sunday end dates
ISO weekMondaySunday
Week 532026
Week 12027
Week 22027
Week 32027
Week 42027
Week 52027
Week 62027
Week 72027
Week 82027
Week 92027
Week 102027
Week 112027
Week 122027
Week 132027
Week 142027
Week 152027
Week 162027
Week 172027
Week 182027
Week 192027
Week 202027
Week 212027
Week 222027
Week 232027
Week 242027
Week 252027
Week 262027
Week 272027
Week 282027
Week 292027
Week 302027
Week 312027
Week 322027
Week 332027
Week 342027
Week 352027
Week 362027
Week 372027
Week 382027
Week 392027
Week 402027
Week 412027
Week 422027
Week 432027
Week 442027
Week 452027
Week 462027
Week 472027
Week 482027
Week 492027
Week 502027
Week 512027
Week 522027

Special days: dates and countdowns

Valentine’s DayEasterHalloweenChristmasThanksgivingMother’s DayFather’s DayBlack FridayNew Year’s DayCyber MondaySt. Patrick’s DayIndependence Day (4th of July)Memorial DayLabor DayBoxing DayGood FridayMartin Luther King Jr. Day
For developers & AI agents

Time data your AI can trust.

Every calendar on WorldTimePortal is available as clean JSON and Markdown — so assistants and apps get the exact date, every time. An MCP server is on the way.

MCP server coming soon
llms.txtllms-full.txtWeek numbers 2027 (Markdown)Eclipses (Markdown)Eclipses (JSON)

2027 week numbers & calendar facts

When is Thanksgiving 2027?
Thanksgiving 2027 is on Thursday, November 25, 2027 (ISO week 47).
How many federal holidays are there in the US in 2027?
There are 11 US federal holidays in 2027. Three fall on a weekend and are observed on another day: Juneteenth (observed Friday, June 18), Independence Day (observed Monday, July 5) and Christmas Day (observed Friday, December 24).
When is Easter 2027?
Easter Sunday 2027 is on Sunday, March 28, 2027 (ISO week 12).
When is Memorial Day 2027?
Memorial Day 2027 is on Monday, May 31, 2027, the last Monday of May (ISO week 22).
When do the clocks change in 2027?
USA and Canada: forward Sunday, March 14 (week 10), back Sunday, November 7 (week 44). UK: forward March 28 (week 12), back October 31 (week 43). Australia (NSW, VIC, ACT, TAS, SA): back April 4 (week 13), forward October 3 (week 39). India does not change its clocks.
How many weeks are in 2027?
2027 has 52 ISO weeks. Week 1 starts on Monday, January 4, 2027, and January 1–3 belong to week 53 of 2026.
When does week 1 of 2027 start?
Week 1 of 2027 runs Monday, January 4 to Sunday, January 10. Under the ISO 8601 rule, week 1 is the week that contains the year's first Thursday — so the first three days of January 2027 still count as week 53 of 2026.
What week number is New Year's Day 2027?
Friday, January 1, 2027 sits in ISO week 53 of 2026, not week 1 of 2027. Numbered weeks only begin on Monday, January 4.
Is 2027 a 53-week year?
No. 2027 has 52 ISO weeks, ending Friday, December 31 (week 52). The previous 53-week ISO year was 2026; the next one is 2032.
What week number is Christmas 2027?
Christmas Day 2027 falls on Saturday, December 25 — ISO week 51. The US observed day off, Friday, December 24, is also in week 51, while the UK, Canada and Australia move their substitute days to Monday, December 27, which is already week 52.
What week number is July 4, 2027?
Independence Day 2027 falls on Sunday, July 4 — ISO week 26. The observed US day off, Monday, July 5, is in week 27.
How many working days are there in 2027?
2027 has 261 weekdays (Monday to Friday). Subtract the 11 US federal holidays, all of which land on a weekday once observed dates are used, and you get 250 working days.
How many weekends are in 2027?
52 weekends — 104 Saturdays and Sundays. 2027 is a common year of 365 days that starts and ends on a Friday, so every weekday appears 52 or 53 times and no week is split across years.
Which ISO weeks of 2027 contain a US federal holiday?
Observed federal holidays fall in weeks 3, 7, 22, 24, 27, 36, 41, 45, 47, 51. New Year's Day is the exception: it is celebrated on Friday, January 1, which is still week 53 of 2026.
What week number is Halloween 2027?
Halloween 2027 is Sunday, October 31 — the last day of ISO week 43, which also contains Diwali (Friday, October 29).
When do the 2027 quarters end by week number?
Q1 ends Wednesday, March 31 (week 13), Q2 ends Wednesday, June 30 (week 26), Q3 ends Thursday, September 30 (week 39) and Q4 ends Friday, December 31 (week 52).
When is the UK Christmas bank holiday 2027?
Christmas Day falls on Saturday, December 25 and moves to Monday, December 27, while Boxing Day falls on Sunday, December 26 and moves to Tuesday, December 28. Both substitute bank holidays are in ISO week 52.
When is Thanksgiving in Canada 2027?
Canadian Thanksgiving is Monday, October 11, 2027 — ISO week 41, three weeks before US Thanksgiving on November 25.
When is Australia Day 2027?
Australia Day is Tuesday, January 26, 2027 (ISO week 4) and is a public holiday in every state and territory.
When is Republic Day 2027 in India?
Republic Day is Tuesday, January 26, 2027 (ISO week 4), a gazetted holiday nationwide. India keeps a single time zone (IST, UTC+5:30) and never changes its clocks.
Does the 2027 calendar start the week on Monday or Sunday?
Our 2027 calendars run Monday to Sunday and number every week the ISO 8601 way, so week 1 is always the week with the year's first Thursday. Many US-printed calendars start on Sunday — the week number is the reliable way to compare the two.
Why do some early-January 2027 dates show week 53?
Because ISO weeks belong to a year, not a calendar year. January 1–3, 2027 are Friday, Saturday and Sunday of the week that began Monday, December 28, 2026, and that week is week 53 of 2026.