Calendarby GlyphSeptember 2028 calendar
September 2028
Coming upJune 2028
Coming upAugust 2028
Ghost MonthThe seventh lunar month, when the gates of the underworld open; the Ghost Festival falls on its 15th day. Day 1 of lunar month 7.Hong Kong Observatory, computedDetails →Ganesh ChaturthiThe birth of Ganesha; a ten-day festival ending with immersion (Anant Chaturdashi). Bhadrapada, Shukla 4. Regional dates can differ by a day.Wikipedia, computedDetails →Minnesota State Fair 2028State Fairgrounds, Falcon HeightsThe Great Minnesota Get-Together: twelve days ending on Labor Day.Minnesota State Fair, computedDetails →Das Lakshana Parva (Digambara)Ten days on the ten virtues, the Digambara Paryushana, ending on Anant Chaturdashi. Bhadrapada, Shukla 5. Regional dates can differ by a day.Wikipedia, computedDetails →
Coming upSeptember 2028
Onam (Thiruvonam)Kerala’s harvest festival and the homecoming of King Mahabali: pookalam flower carpets, the Onasadya feast and snake-boat races. Thiruvonam day in the month...Wikipedia, computedDetails →Bear season opens (MN)Permit areas & no-quota areaThe season runs through Oct 15, 2028 (Permit areas & no-quota area).Minnesota DNRDetails →Orthodox Church New Year (Revised Julian calendar)The Indiction, the start of the church year.Orthodox Church in America, computedDetails →National Day (Vietnam)VietnamA public holiday in Vietnam, known locally as Quốc khánh.Nager.DateDetails →Wilhelm Ostwald, born 1853 (175 years)Latvian-German chemist and academic, Nobel Prize laureate (died 1932).WikipediaDetails →Full moon: Corn MoonTraditional North American name: Corn Moon. Moon 406,148 km from Earth.NASA, computedDetails →Ghost Festival (Zhongyuan)Offerings to ancestors and wandering spirits (Buddhist Ullambana). Day 15 of lunar month 7.Hong Kong Observatory, computedDetails →150th anniversary: The passenger steamship SS Princess Alice sank in the River Thames after...In 1878, The passenger steamship SS Princess Alice sank in the River Thames after colliding (pictured) with the collier Bywell Castle, killing more than 600...WikipediaDetails →Labor DayUnited StatesA public holiday in the United States, officially Labor Day.Nager.DateDetails →US stock markets closed: Labor Day 2028New York Stock Exchange, New YorkNYSE markets are closed for Labor Day.NYSEDetails →Labour Day (Puerto Rico)Puerto RicoA public holiday in Puerto Rico, known locally as Día del Trabajo.Nager.DateDetails →International Day of CharityA United Nations international day.United NationsDetails →International Day of the World’s Indigenous Women and GirlsA United Nations international day.United NationsDetails →ECB monetary policy meetingEuropean Central Bank, FrankfurtThe ECB Governing Council sets euro area interest rates; the decision is published on the last day, followed by the press conference.European Central BankDetails →Mercury at greatest eastern elongationMercury is 27.1° from the Sun, best seen in the evening sky.Astronomy Engine, computedDetails →250th anniversary: Anglo-French War: Having established an alliance with the United States, France...In 1778, Anglo-French War: Having established an alliance with the United States, France invaded the Caribbean island of Dominica and captured its British fort.WikipediaDetails →Independence Day (Brazil)BrazilA public holiday in Brazil, known locally as Dia da Independência.Nager.DateDetails →International Day of Clean Air for Blue SkiesA United Nations international day.United NationsDetails →International Day of Police CooperationA United Nations international day.United NationsDetails →World Duchenne Awareness DayA United Nations international day.United NationsDetails →International Literacy DayA United Nations international day.United NationsDetails →Nativity of the Blessed Virgin MaryThe birthday of Mary.USCCB liturgical year, computedDetails →Nativity of the Theotokos (Revised Julian calendar)The birth of Mary, one of the Twelve Great Feasts.Orthodox Church in America, computedDetails →AWS retires Amazon EMR 7.14AWSAmazon EMR ends support for this runtime.AWSDetails →Microsoft retires Entity Linking from Azure AI LanguageMicrosoftAzure AI Language ends support for this service.MicrosoftDetails →Microsoft retires Operating System (OS) Disks on Standard HDDMicrosoftAzure Disk Storage ends support for this service.MicrosoftDetails →Leo Tolstoy, born 1828 (200 years)Russian author and playwright (died 1910).WikipediaDetails →International Day to Protect Education from AttackA United Nations international day.United NationsDetails →National Grandparents DayThe first Sunday after Labor Day.US Code, computedDetails →Peru AI Law and Regulation: Private sector: production, agriculture, energy, miningPeruObligations apply three years after publication.RegulationsDetails →Enkutatash and Nayrouz (Ethiopian and Coptic New Year)Meskerem 1 (Thout 1): the Ethiopian year 2021 and the Coptic year of the Martyrs 1745 begin.Ethiopian Orthodox Tewahedo Church, computedDetails →50th anniversary: British medical photographer Janet Parker became the last recorded person to...In 1978, British medical photographer Janet Parker became the last recorded person to die from smallpox, leading to a debate on whether the virus should be...WikipediaDetails →Last quarter moonThe Moon is half lit (waning).NASA, computedDetails →Theodor W. Adorno, born 1903 (125 years)German sociologist and philosopher (died 1969).WikipediaDetails →Cyber Resilience Act: Report on single reporting platformEuropean UnionCommission report assessing the single reporting platform's effectiveness (Art 70(2)).RegulationsDetails →100th anniversary: The Okeechobee hurricane first struck the island of GuadeloupeIn 1928, The Okeechobee hurricane first struck the island of Guadeloupe; eventually it reached the United States and caused over 4,000 deaths overall.WikipediaDetails →Enkutatash (Ethiopia)EthiopiaA public holiday in Ethiopia.Nager.DateDetails →Gahambar Paitishahem (harvest)The third Gahambar, the grain harvest, in the Fasli calendar.avesta.org Zoroastrian calendars, computedDetails →25th anniversary: The first public release of Steam, a distribution service for computer games,...In 2003, The first public release of Steam, a distribution service for computer games, was made available for download.WikipediaDetails →25th anniversary: Typhoon Maemi, the strongest recorded typhoon to strike South Korea, made...In 2003, Typhoon Maemi, the strongest recorded typhoon to strike South Korea, made landfall near Busan.WikipediaDetails →United Nations Day for South-South CooperationA United Nations international day.United NationsDetails →EU Data Act: Commission evaluationEuropean UnionCommission evaluation report due, including the impact of cloud switching rules (Arts 23-31) (Art 49(2)).RegulationsDetails →Claudette Colbert, born 1903 (125 years)American actress (died 1996).WikipediaDetails →Elevation of the Holy Cross (Revised Julian calendar)One of the Twelve Great Feasts, a strict fast day.Orthodox Church in America, computedDetails →Exaltation of the Holy CrossHoly Cross Day: honors the cross, from the dedication of the Church of the Holy Sepulchre in 335.USCCB liturgical year, computedDetails →Orthodox Church New Year (Julian calendar)The Indiction, the start of the church year. September 1 in the Julian calendar.Orthodox Church in America, computedDetails →25th anniversary: President Kumba Ialá (pictured) of Guinea-Bissau was deposed in a bloodless...In 2003, President Kumba Ialá (pictured) of Guinea-Bissau was deposed in a bloodless military coup.WikipediaDetails →National Hispanic Heritage MonthNational Hispanic Heritage Month, observed across the US.Library of Congress and partners, computedDetails →International Day of DemocracyA United Nations international day.United NationsDetails →Microsoft retires Azure Disk EncryptionMicrosoftAzure Virtual Machine Scale Sets ends support for this service.MicrosoftDetails →Microsoft retires hsmPlatform 1 Keys in Azure Key VaultMicrosoftAzure Key Vault ends support for this service.MicrosoftDetails →Independence Day (Mexico)MexicoA public holiday in Mexico, known locally as Día de la Independencia.Nager.DateDetails →Leil SelichotThe first night of Ashkenazi penitential prayers (Selichot) before Rosh Hashanah, late on Saturday night.Hebcal, computedDetails →International Day for Interventional CardiologyA United Nations international day.United NationsDetails →International Day for the Preservation of the Ozone LayerA United Nations international day.United NationsDetails →International Day of Science, Technology and Innovation for the SouthA United Nations international day.United NationsDetails →150th anniversary: A British surveyor was detained by the Zulu on the border with the Colony of NatalIn 1878, A British surveyor was detained by the Zulu on the border with the Colony of Natal; a demand for reparations for the incident formed part of an...WikipediaDetails →Anastacia, born 1968 (60 years)American singer-songwriter.WikipediaDetails →World Patient Safety DayA United Nations international day.United NationsDetails →New moonThe Moon is between Earth and the Sun; darkest nights for stargazing.NASA, computedDetails →National holiday (Chile)ChileA public holiday in Chile, known locally as Fiestas Patrias.Nager.DateDetails →Respect for the Aged Day (Japan)JapanA public holiday in Japan.Nager.DateDetails →50s, born 53 (1975 years)Roman emperor (died 117).WikipediaDetails →International Equal Pay DayA United Nations international day.United NationsDetails →Microsoft retires Microsoft Dev BoxMicrosoftAzure Microsoft Dev Box ends support for this service.MicrosoftDetails →Sharad NavaratriNine nights of the goddess Durga; Durga Puja in Bengal. Ashvin, Shukla 1. Regional dates can differ by a day.Wikipedia, computedDetails →Army Day (Chile)ChileA public holiday in Chile, known locally as Día de las Glorias del Ejército.Nager.DateDetails →Autumn HiganThe week of the equinox, when Japanese Buddhists visit and tidy family graves.Wikipedia, computedDetails →Jeremy Irons, born 1948 (80 years)English actor, winner of multiple accolades (Oscar, Tony, Emmy, Golden Globe).WikipediaDetails →George R. R. Martin, born 1948 (80 years)American novelist and short story writer.WikipediaDetails →World Cleanup DayA United Nations international day.United NationsDetails →Rosh HashanahThe Jewish New Year. Begins at sundown on Wed, September 20, 2028.Hebcal, computedDetails →International Day of PeaceA United Nations international day.United NationsDetails →Founders Day (Ghana)GhanaA public holiday in Ghana.Nager.DateDetails →Days of Awe (Ten Days of Repentance)The ten days from Rosh Hashanah to Yom Kippur. Begins at sundown on Wed, September 20, 2028.Hebcal, computedDetails →Nativity of the Theotokos (Julian calendar)The birth of Mary, one of the Twelve Great Feasts. September 8 in the Julian calendar.Orthodox Church in America, computedDetails →Heike Kamerlingh Onnes, born 1853 (175 years)Dutch physicist and academic, Nobel Prize laureate (died 1926).WikipediaDetails →September equinoxAutumn begins in the Northern Hemisphere, spring in the Southern.US Naval Observatory, computedDetails →MabonAutumn equinox sabbat. Northern Hemisphere dates.Wheel of the Year, computedDetails →Autumnal Equinox Day (Japan)JapanA public holiday in Japan.Nager.DateDetails →25th anniversary: Dolphin, the first emulator for the GameCube that could run commercial video...In 2003, Dolphin, the first emulator for the GameCube that could run commercial video games, was released.WikipediaDetails →Andrea Bocelli, born 1958 (70 years)Italian singer-songwriter and producer.WikipediaDetails →National Hunting and Fishing DayCelebrates hunters and anglers and their role in conservation; the fourth Saturday in September.National Hunting and Fishing Day, computedDetails →National Public Lands DayA fee-free day at national parks and other federal lands; the fourth Saturday in September.National Park Service, computedDetails →225th anniversary: Maratha troops were defeated by forces of the British East India Company at the...In 1803, Maratha troops were defeated by forces of the British East India Company at the Battle of Assaye, one of the decisive battles of the Second...WikipediaDetails →International Day of Sign LanguagesA United Nations international day.United NationsDetails →CockroachDB retires CockroachDB 26.2CockroachDBCockroachDB ends support for this runtime.CockroachDBDetails →Fast of GedaliahA minor fast day after Rosh Hashanah. Observed from dawn to nightfall.Hebcal, computedDetails →125th anniversary: Alfred Deakin became the second Australian prime minister, succeeding Edmund BartonIn 1903, Alfred Deakin became the second Australian prime minister, succeeding Edmund Barton, who left office to become a founding justice of the High Court of...WikipediaDetails →World Maritime DayA United Nations international day.United NationsDetails →Durga PujaBengal’s great festival of the goddess Durga, from Maha Saptami to Vijaya Dashami (the goddess is welcomed on Shashthi, the day before). Ashvin, Shukla 7....Wikipedia, computedDetails →50th anniversary: While on approach to San Diego International Airport, Pacific Southwest...In 1978, While on approach to San Diego International Airport, Pacific Southwest Airlines Flight 182, a Boeing 727, collided with a Cessna 172, killing all 137...WikipediaDetails →Heritage Day (South Africa)South AfricaA public holiday in South Africa.Nager.DateDetails →First quarter moonThe Moon is half lit (waxing).NASA, computedDetails →
| Date | Event | |||
|---|---|---|---|---|
| Coming upJune 2028 | ||||
| Jun 5Monin 1 year | Ordinary Time (after Pentecost)The long second stretch of Ordinary Time, from the day after Pentecost to the Saturday before Advent.Religion · Catholic · to Dec 2 · USCCB liturgical year | – | annual | USCCB liturgical yearComputed (rule) |
| Coming upAugust 2028 | ||||
| Aug 20Sunin 1 year | Ghost MonthThe seventh lunar month, when the gates of the underworld open; the Ghost Festival falls on its 15th day. Day 1 of lunar month 7.Religion · Taoism and Chinese folk religion · to Sep 18 · Hong Kong Observatory | – | annual | Hong Kong ObservatoryComputed (rule) |
| Aug 23Wedin 1 year | Ganesh ChaturthiTentativeThe birth of Ganesha; a ten-day festival ending with immersion (Anant Chaturdashi). Bhadrapada, Shukla 4. Regional dates can differ by a day.Religion · Hinduism · to Sep 2 · Wikipedia | – | annual | WikipediaComputed (rule) |
| Aug 24Thuin 1 year | Minnesota State Fair 2028The Great Minnesota Get-Together: twelve days ending on Labor Day.Culture · Minnesota · to Sep 4 · State Fairgrounds, Falcon Heights · Minnesota State Fair | State Fairgrounds, Falcon Heights | annual | Minnesota State FairComputed (rule) |
| Das Lakshana Parva (Digambara)TentativeTen days on the ten virtues, the Digambara Paryushana, ending on Anant Chaturdashi. Bhadrapada, Shukla 5. Regional dates can differ by a day.Religion · Jainism · to Sep 2 · Wikipedia | – | annual | WikipediaComputed (rule) | |
| Coming upSeptember 2028 | ||||
| Sep 1Friin 1 year | Onam (Thiruvonam)TentativeKerala’s harvest festival and the homecoming of King Mahabali: pookalam flower carpets, the Onasadya feast and snake-boat races. Thiruvonam day in the month...Religion · Hinduism · Wikipedia | – | annual | WikipediaComputed (rule) |
| Bear season opens (MN)The season runs through Oct 15, 2028 (Permit areas & no-quota area).Outdoors · Hunting · to Oct 15 · Permit areas & no-quota area · Minnesota DNR | Permit areas & no-quota area | annual | Minnesota DNR | |
| Orthodox Church New Year (Revised Julian calendar)The Indiction, the start of the church year.Religion · Eastern Orthodox · Orthodox Church in America | – | annual | Orthodox Church in AmericaComputed (rule) | |
| Sep 2Satin 1 year | National Day (Vietnam)A public holiday in Vietnam, known locally as Quốc khánh.Holidays · Vietnam · Vietnam · Nager.Date | Vietnam | annual | Nager.Date |
| Wilhelm Ostwald, born 1853 (175 years)Latvian-German chemist and academic, Nobel Prize laureate (died 1932).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| Sep 3Sunin 1 year | Full moon: Corn MoonTraditional North American name: Corn Moon. Moon 406,148 km from Earth.Sky · Moon phases · 6:48 pm CT · NASA | – | monthly | NASAComputed (rule) |
| Ghost Festival (Zhongyuan)Offerings to ancestors and wandering spirits (Buddhist Ullambana). Day 15 of lunar month 7.Religion · Buddhism · Hong Kong Observatory | – | annual | Hong Kong ObservatoryComputed (rule) | |
| 150th anniversary: The passenger steamship SS Princess Alice sank in the River Thames after...In 1878, The passenger steamship SS Princess Alice sank in the River Thames after colliding (pictured) with the collier Bywell Castle, killing more than 600...History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| Sep 4Monin 1 year | Labor DayA public holiday in the United States, officially Labor Day.Holidays · United States · United States · Nager.Date | United States | annual | Nager.Date |
| US stock markets closed: Labor Day 2028NYSE markets are closed for Labor Day.Economy · Market holidays · New York Stock Exchange, New York · NYSE | New York Stock Exchange, New York | annual | NYSE | |
| Labour Day (Puerto Rico)A public holiday in Puerto Rico, known locally as Día del Trabajo.Holidays · Puerto Rico · Puerto Rico · Nager.Date | Puerto Rico | annual | Nager.Date | |
| Sep 5Tuein 1 year | International Day of CharityA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations |
| International Day of the World’s Indigenous Women and GirlsA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 6Wedin 1 year | ECB monetary policy meetingThe ECB Governing Council sets euro area interest rates; the decision is published on the last day, followed by the press conference.Economy · Other central banks · 2:15 pm GMT+2 · to Sep 7 · European Central Bank, Frankfurt · European Central Bank | European Central Bank, Frankfurt | eight times a year | European Central Bank |
| Mercury at greatest eastern elongationMercury is 27.1° from the Sun, best seen in the evening sky.Sky · Planets · Astronomy Engine | – | recurring | Astronomy EngineComputed (rule) | |
| Sep 7Thuin 1 year | 250th anniversary: Anglo-French War: Having established an alliance with the United States, France...In 1778, Anglo-French War: Having established an alliance with the United States, France invaded the Caribbean island of Dominica and captured its British fort.History · Anniversaries · Wikipedia | – | annual | Wikipedia |
| Independence Day (Brazil)A public holiday in Brazil, known locally as Dia da Independência.Holidays · Brazil · Brazil · Nager.Date | Brazil | annual | Nager.Date | |
| International Day of Clean Air for Blue SkiesA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| International Day of Police CooperationA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| World Duchenne Awareness DayA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 8Friin 1 year | International Literacy DayA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations |
| Nativity of the Blessed Virgin MaryThe birthday of Mary.Religion · Catholic · USCCB liturgical year | – | annual | USCCB liturgical yearComputed (rule) | |
| Nativity of the Theotokos (Revised Julian calendar)The birth of Mary, one of the Twelve Great Feasts.Religion · Eastern Orthodox · Orthodox Church in America | – | annual | Orthodox Church in AmericaComputed (rule) | |
| AWS retires Amazon EMR 7.14UnverifiedAmazon EMR ends support for this runtime.Tech · Retirements · AWS · AWS | AWS | one-off | AWS | |
| Microsoft retires Entity Linking from Azure AI LanguageUnverifiedAzure AI Language ends support for this service.Tech · Retirements · Microsoft · Microsoft | Microsoft | one-off | Microsoft | |
| Microsoft retires Operating System (OS) Disks on Standard HDDUnverifiedAzure Disk Storage ends support for this service.Tech · Retirements · Microsoft · Microsoft | Microsoft | one-off | Microsoft | |
| Sep 9Satin 1 year | Leo Tolstoy, born 1828 (200 years)Russian author and playwright (died 1910).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia |
| International Day to Protect Education from AttackA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 10Sunin 1 year | National Grandparents DayThe first Sunday after Labor Day.Observances · Days · US Code | – | annual | US CodeComputed (rule) |
| Peru AI Law and Regulation: Private sector: production, agriculture, energy, miningTentativeObligations apply three years after publication.Tech · Compliance deadlines · Peru · Regulations | Peru | one-off | Regulations | |
| Sep 11Monin 1 year | Enkutatash and Nayrouz (Ethiopian and Coptic New Year)Meskerem 1 (Thout 1): the Ethiopian year 2021 and the Coptic year of the Martyrs 1745 begin.Religion · Oriental Orthodox (Coptic, Ethiopian, Armenian) · Ethiopian Orthodox Tewahedo Church | – | annual | Ethiopian Orthodox Tewahedo ChurchComputed (rule) |
| 50th anniversary: British medical photographer Janet Parker became the last recorded person to...In 1978, British medical photographer Janet Parker became the last recorded person to die from smallpox, leading to a debate on whether the virus should be...History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| Last quarter moonThe Moon is half lit (waning).Sky · Moon phases · 7:46 pm CT · NASA | – | monthly | NASAComputed (rule) | |
| Theodor W. Adorno, born 1903 (125 years)German sociologist and philosopher (died 1969).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| Cyber Resilience Act: Report on single reporting platformCommission report assessing the single reporting platform's effectiveness (Art 70(2)).Tech · Compliance deadlines · European Union · Regulations | European Union | one-off | Regulations | |
| Sep 12Tuein 1 year | 100th anniversary: The Okeechobee hurricane first struck the island of GuadeloupeIn 1928, The Okeechobee hurricane first struck the island of Guadeloupe; eventually it reached the United States and caused over 4,000 deaths overall.History · Anniversaries · Wikipedia | – | annual | Wikipedia |
| Enkutatash (Ethiopia)A public holiday in Ethiopia.Holidays · Ethiopia · Ethiopia · Nager.Date | Ethiopia | annual | Nager.Date | |
| Gahambar Paitishahem (harvest)The third Gahambar, the grain harvest, in the Fasli calendar.Religion · Zoroastrianism · to Sep 16 · avesta.org Zoroastrian calendars | – | annual | avesta.org Zoroastrian calendarsComputed (rule) | |
| 25th anniversary: The first public release of Steam, a distribution service for computer games,...In 2003, The first public release of Steam, a distribution service for computer games, was made available for download.History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| 25th anniversary: Typhoon Maemi, the strongest recorded typhoon to strike South Korea, made...In 2003, Typhoon Maemi, the strongest recorded typhoon to strike South Korea, made landfall near Busan.History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| United Nations Day for South-South CooperationA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| EU Data Act: Commission evaluationCommission evaluation report due, including the impact of cloud switching rules (Arts 23-31) (Art 49(2)).Tech · Compliance deadlines · European Union · Regulations | European Union | one-off | Regulations | |
| Sep 13Wedin 1 year | Claudette Colbert, born 1903 (125 years)American actress (died 1996).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia |
| Sep 14Thuin 1 year | Elevation of the Holy Cross (Revised Julian calendar)One of the Twelve Great Feasts, a strict fast day.Religion · Eastern Orthodox · Orthodox Church in America | – | annual | Orthodox Church in AmericaComputed (rule) |
| Exaltation of the Holy CrossHoly Cross Day: honors the cross, from the dedication of the Church of the Holy Sepulchre in 335.Religion · Christianity · USCCB liturgical year | – | annual | USCCB liturgical yearComputed (rule) | |
| Orthodox Church New Year (Julian calendar)The Indiction, the start of the church year. September 1 in the Julian calendar.Religion · Eastern Orthodox · Orthodox Church in America | – | annual | Orthodox Church in AmericaComputed (rule) | |
| 25th anniversary: President Kumba Ialá (pictured) of Guinea-Bissau was deposed in a bloodless...In 2003, President Kumba Ialá (pictured) of Guinea-Bissau was deposed in a bloodless military coup.History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| Sep 15Friin 1 year | National Hispanic Heritage MonthNational Hispanic Heritage Month, observed across the US.Observances · Heritage months · to Oct 15 · Library of Congress and partners | – | annual | Library of Congress and partnersComputed (rule) |
| International Day of DemocracyA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Microsoft retires Azure Disk EncryptionUnverifiedAzure Virtual Machine Scale Sets ends support for this service.Tech · Retirements · Microsoft · Microsoft | Microsoft | one-off | Microsoft | |
| Microsoft retires hsmPlatform 1 Keys in Azure Key VaultUnverifiedAzure Key Vault ends support for this service.Tech · Retirements · Microsoft · Microsoft | Microsoft | one-off | Microsoft | |
| Sep 16Satin 1 year | Independence Day (Mexico)A public holiday in Mexico, known locally as Día de la Independencia.Holidays · Mexico · Mexico · Nager.Date | Mexico | annual | Nager.Date |
| Leil SelichotThe first night of Ashkenazi penitential prayers (Selichot) before Rosh Hashanah, late on Saturday night.Religion · Judaism · Hebcal | – | annual | HebcalComputed (rule) | |
| International Day for Interventional CardiologyA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| International Day for the Preservation of the Ozone LayerA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| International Day of Science, Technology and Innovation for the SouthA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 17Sunin 1 year | 150th anniversary: A British surveyor was detained by the Zulu on the border with the Colony of NatalIn 1878, A British surveyor was detained by the Zulu on the border with the Colony of Natal; a demand for reparations for the incident formed part of an...History · Anniversaries · Wikipedia | – | annual | Wikipedia |
| Anastacia, born 1968 (60 years)American singer-songwriter.People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| World Patient Safety DayA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 18Monin 1 year | New moonThe Moon is between Earth and the Sun; darkest nights for stargazing.Sky · Moon phases · 1:24 pm CT · NASA | – | monthly | NASAComputed (rule) |
| National holiday (Chile)A public holiday in Chile, known locally as Fiestas Patrias.Holidays · Chile · Chile · Nager.Date | Chile | annual | Nager.Date | |
| Respect for the Aged Day (Japan)A public holiday in Japan.Holidays · Japan · Japan · Nager.Date | Japan | annual | Nager.Date | |
| 50s, born 53 (1975 years)Roman emperor (died 117).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| International Equal Pay DayA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Microsoft retires Microsoft Dev BoxUnverifiedAzure Microsoft Dev Box ends support for this service.Tech · Retirements · Microsoft · Microsoft | Microsoft | one-off | Microsoft | |
| Sep 19Tuein 1 year | Sharad NavaratriTentativeNine nights of the goddess Durga; Durga Puja in Bengal. Ashvin, Shukla 1. Regional dates can differ by a day.Religion · Hinduism · to Sep 27 · Wikipedia | – | annual | WikipediaComputed (rule) |
| Army Day (Chile)A public holiday in Chile, known locally as Día de las Glorias del Ejército.Holidays · Chile · Chile · Nager.Date | Chile | annual | Nager.Date | |
| Autumn HiganThe week of the equinox, when Japanese Buddhists visit and tidy family graves.Religion · Buddhism · to Sep 25 · Wikipedia | – | annual | WikipediaComputed (rule) | |
| Jeremy Irons, born 1948 (80 years)English actor, winner of multiple accolades (Oscar, Tony, Emmy, Golden Globe).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| Sep 20Wedin 1 year | George R. R. Martin, born 1948 (80 years)American novelist and short story writer.People · Birth anniversaries · Wikipedia | – | annual | Wikipedia |
| World Cleanup DayA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 21Thuin 1 year | Rosh HashanahThe Jewish New Year. Begins at sundown on Wed, September 20, 2028.Religion · Judaism · to Sep 22 · Hebcal | – | annual | HebcalComputed (rule) |
| International Day of PeaceA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Founders Day (Ghana)A public holiday in Ghana.Holidays · Ghana · Ghana · Nager.Date | Ghana | annual | Nager.Date | |
| Days of Awe (Ten Days of Repentance)The ten days from Rosh Hashanah to Yom Kippur. Begins at sundown on Wed, September 20, 2028.Religion · Judaism · to Sep 30 · Hebcal | – | annual | HebcalComputed (rule) | |
| Nativity of the Theotokos (Julian calendar)The birth of Mary, one of the Twelve Great Feasts. September 8 in the Julian calendar.Religion · Eastern Orthodox · Orthodox Church in America | – | annual | Orthodox Church in AmericaComputed (rule) | |
| Heike Kamerlingh Onnes, born 1853 (175 years)Dutch physicist and academic, Nobel Prize laureate (died 1926).People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| Sep 22Friin 1 year | September equinoxAutumn begins in the Northern Hemisphere, spring in the Southern.Sky · Solstices and equinoxes · 6:45 am CT · US Naval Observatory | – | annual | US Naval ObservatoryComputed (rule) |
| MabonAutumn equinox sabbat. Northern Hemisphere dates.Religion · Pagan and Wiccan · Wheel of the Year | – | annual | Wheel of the YearComputed (rule) | |
| Autumnal Equinox Day (Japan)A public holiday in Japan.Holidays · Japan · Japan · Nager.Date | Japan | annual | Nager.Date | |
| 25th anniversary: Dolphin, the first emulator for the GameCube that could run commercial video...In 2003, Dolphin, the first emulator for the GameCube that could run commercial video games, was released.History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| Andrea Bocelli, born 1958 (70 years)Italian singer-songwriter and producer.People · Birth anniversaries · Wikipedia | – | annual | Wikipedia | |
| Sep 23Satin 1 year | National Hunting and Fishing DayCelebrates hunters and anglers and their role in conservation; the fourth Saturday in September.Outdoors · Parks and public lands · National Hunting and Fishing Day | – | annual | National Hunting and Fishing DayComputed (rule) |
| National Public Lands DayA fee-free day at national parks and other federal lands; the fourth Saturday in September.Outdoors · Parks and public lands · National Park Service | – | annual | National Park ServiceComputed (rule) | |
| 225th anniversary: Maratha troops were defeated by forces of the British East India Company at the...In 1803, Maratha troops were defeated by forces of the British East India Company at the Battle of Assaye, one of the decisive battles of the Second...History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| International Day of Sign LanguagesA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| CockroachDB retires CockroachDB 26.2UnverifiedCockroachDB ends support for this runtime.Tech · Retirements · CockroachDB · CockroachDB | CockroachDB | one-off | CockroachDB | |
| Sep 24Sunin 1 year | Fast of GedaliahA minor fast day after Rosh Hashanah. Observed from dawn to nightfall.Religion · Judaism · Hebcal | – | annual | HebcalComputed (rule) |
| 125th anniversary: Alfred Deakin became the second Australian prime minister, succeeding Edmund BartonIn 1903, Alfred Deakin became the second Australian prime minister, succeeding Edmund Barton, who left office to become a founding justice of the High Court of...History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| World Maritime DayA United Nations international day.Observances · UN international days · United Nations | – | annual | United Nations | |
| Sep 25Monin 1 year | Durga PujaTentativeBengal’s great festival of the goddess Durga, from Maha Saptami to Vijaya Dashami (the goddess is welcomed on Shashthi, the day before). Ashvin, Shukla 7....Religion · Hinduism · to Sep 27 · Wikipedia | – | annual | WikipediaComputed (rule) |
| 50th anniversary: While on approach to San Diego International Airport, Pacific Southwest...In 1978, While on approach to San Diego International Airport, Pacific Southwest Airlines Flight 182, a Boeing 727, collided with a Cessna 172, killing all 137...History · Anniversaries · Wikipedia | – | annual | Wikipedia | |
| Heritage Day (South Africa)A public holiday in South Africa.Holidays · South Africa · South Africa · Nager.Date | South Africa | annual | Nager.Date | |
| First quarter moonThe Moon is half lit (waxing).Sky · Moon phases · 8:10 am CT · NASA | – | monthly | NASAComputed (rule) | |