2017
Institutional decision
Argentina Independence Day
The official legal text records the law as sanctioned on September 27, 2017.
Evergreen date guide
What is celebrated on September 27?
See the observances and verified observance-history milestones attached to September 27. Each observance keeps its own source and date details.
Verified history
Today in history →On this date in observance history
Selected observance milestones connected to this date, based on reviewed sources.
2017
Later action
Argentina Independence Day
The law lists July 9, Independence Day, as a fixed non-transferable national holiday.
2017
Later action
Día de la Soberanía Nacional (National Sovereignty Day)
Replaced Decree 1584/2010 and retained 20 November as a transferable national holiday.
2017
Later action
Día del Respeto a la Diversidad Cultural
Lists 12 October Día del Respeto a la Diversidad Cultural as a transferable national holiday in the current statutory framework.
2005
Later action
Independence Day
Provides the current official-holiday framework under which Independence Day is listed on November 22.
1995
Institutional decision
National Archives Day (Philippines)
Proclamation No. 660 is dated September 27, 1995.
1995
Precursor
National Archives Day (Philippines)
Proclamation No. 660 elevated the existing RMAO annual commemoration into a recurring nationally declared National Archives Day on October 21.
1985
Later action
Día de La Rioja
Made 9 June each year a permanent, paid and non-recoverable labour holiday within the Autonomous Community of La Rioja.
Reviewed depth
Other in-depth guides on September 27
Source-backedFixed AnnualIn-depth guide
Fête de la Communauté française
Belgium’s federal information service identifies 27 September as the Fête de la Communauté française, while Fédération Wallonie-Bruxelles materials continue to use the date in current calen…
Source-backedRule Based AnnualIn-depth guide
Gold Star Mother's and Family's Day
The 2025 presidential proclamation uses Gold Star Mother's and Family's Day; 36 U.S.C. §111 separately designates the last Sunday in September as Gold Star Mother's Day.
Source-backedFixed AnnualIn-depth guide
Independence Day of Turkmenistan
The Ministry of Foreign Affairs states that 27 September is celebrated as Independence Day in Turkmenistan and lists it among public holidays.
Source-backedRule Based AnnualIn-depth guide
World Rivers Day
World Rivers Day organizers; global initiative launched in 2005 alongside the UN Water for Life Decade
Source-backedFixed AnnualIn-depth guide
World Tourism Day
UN Tourism observance
Explore the mix
All topics →Topics represented on September 27
5 observances
All observances on this date
Source-backedFixed AnnualIn-depth guide
Fête de la Communauté française
Belgium’s federal information service identifies 27 September as the Fête de la Communauté française, while Fédération Wallonie-Bruxelles materials continue to use the date in current calen…
Source-backedRule Based AnnualIn-depth guide
Gold Star Mother's and Family's Day
The 2025 presidential proclamation uses Gold Star Mother's and Family's Day; 36 U.S.C. §111 separately designates the last Sunday in September as Gold Star Mother's Day.
Source-backedFixed AnnualIn-depth guide
Independence Day of Turkmenistan
The Ministry of Foreign Affairs states that 27 September is celebrated as Independence Day in Turkmenistan and lists it among public holidays.
Source-backedRule Based AnnualIn-depth guide
World Rivers Day
World Rivers Day organizers; global initiative launched in 2005 alongside the UN Water for Life Decade
Source-backedFixed AnnualIn-depth guide
World Tourism Day
UN Tourism observance
How dates are selected
This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.
Read the methodology →