World Water Monitoring Day

World Water Monitoring Day

Navy Day

Navy Day (Croatia)

HIV.gov

National HIV/AIDS and Aging Awareness Day (United States)

Fiestas Patrias (Chile)

National Day or Dieciocho (Chile)

Ryukyuan languages

Island Language Day (Okinawa Prefecture, Japan)

National Music Day in Azerbaijan

Day of National Music (Azerbaijan)

September 18 (Eastern Orthodox liturgics)

Christian feast day:
September 18 (Eastern Orthodox liturgics)

Richardis

Christian feast day:
Richardis

Methodius of Olympus

Christian feast day:
Methodius of Olympus

John Macias

Christian feast day:
Juan Macias

Joseph of Cupertino

Christian feast day:
Joseph of Cupertino

Eustorgius I

Christian feast day:
Eustorgius I

Edward Bouverie Pusey

Christian feast day:
Edward Bouverie Pusey (Episcopal Church)

Constantius (Theban Legion)

Christian feast day:
Constantius (Theban Legion)

Salvatore Schillaci

Salvatore Schillaci, Italian footballer (born 1964)