When flag day is celebrated?

In the United States:

On June 14, 1777 the Second Continental Congress passed a resolution that established our Nation's flag: Resolved: that the flag of the United States be made of thirteen stripes, alternate red and white; that the union be thirteen stars, white in a blue field, representing a new Constellation. Thus we recognize June 14th as Flag Day in the United States.

Afghanistan: August 19

Albania: November 28

Argentina: June 20

Aruba: March 18

Australia: September 3

Azerbaijan: November 9

Åland: Last Sunday of April

Bolivia: August 17

Brazil: November 19

Canada: February 15

Quebec: January 21

Colombia: July 20, August 7

Curaçao: July 2

Denmark: June 15

Ecuador: September 26

Estonia: June 4

European Union: May 9

Finland: Midsummer's Day

Faroe Islands: April 25

Georgia: January 14

Greece: October 27

Haiti: May 18

Honduras: September 1

India: December 7

Italy: January 7

Liberia: August 24

Lithuania: January 1

Macedonia: Every 1st and 15th of every month

Mexico: February 24

Moldova: April 27

Norway: May 17

Pakistan: August 11

Peru: June 7

Philippines: May 28 - June 12

Poland: May 2

Portugal: December 1

Romania: June 26

Russia: August 22

Slovenia: April 7

Sweden: June 6

Sri Lanka: February 4

Turkmenistan: February 19

Ukraine: August 23

USE: November 6

United Kingdom: England: April 23

Scotland: November 30

Wales: March 1

Northern Ireland: March 17

Vietnam: March 11