June 1st, International Children’s Day is a big day for Children in Mainland China and these countries: Czech Republic, Bulgaria, Germany, Mongolia, Kazakhstan, Slovakia and many other “advanced” countries unlike the following countries/regions:

North Korea: June 2nd South Korea and Japan: May 5th.,
Canada: November 20 ; Brazil: October 12; Australis: 1st Sunday in July
Chile,Agentina: 2d Sunday of August;
Peru:August 17th;
Egypt: Nov. 20
Singapore, Guatemala: Oct. 1st
Hong Kong (more people are joining mainland for June 1st celebration) and Taiwan: April 4th;
Hungary: the first Monday of October; Israel: Oct. 19
In Congo, Congo DR, Cameroon, Equatorial Guinea, Gabon, Chad, Central African Republic, São Tomé and Príncipe Children’s Day is celebrated on December 25 to honour all the children there.
Mexico: April 30

The USA? It’s been confusing with too much freedom or authority from the president? From the wiki:
“Children’s Day observations in the United States predate both Mother’s and Father’s Day.

The celebration of a special Children’s Day in America dates from the 1860s and earlier.

In 1856, Rev. Charles H. Leonard, D.D., then pastor of the First Universalist Church of Chelsea, Mass., set apart a Sunday for the dedication of children to the Christian life, and for the re-dedication of parents and guardians to bringing-up their children in Christian nurture. This service was first observed the second Sunday in June.[9]

The Universalist Convention at Baltimore in September 1867, passed a resolution commending churches to set apart one Sunday in each year as Children’s Day.[10]

The Methodist Episcopal Church at the Methodist Conference of 1868 recommended that second Sunday in June be annually observed as Children’s Day.[10]

The General Assembly of the Presbyterian Church in 1883 designated the “the second Sabbath in June as Children’s Day.”[11]

Also in 1883, the National Council of Congregational Churches and nearly all the state bodies of that denomination in the United States passed resolutions commending the observance of the day. About this time many other denominations adopted similar recommendations.[10]

Chase’s Calendar of Events cites Children’s Sunday and notes that The Commonwealth of Massachusetts issues an annual proclamation for the second Sunday in June.

Numerous churches and denominations currently observe the second Sunday in June including the African Methodist Episcopal Church[12] and the Church of the Nazarene[13].

Children’s Day, was proclaimed by President Bill Clinton in October 2000. He declared that it be held on October 8.

“National Child’s Day” was proclaimed by the former President of the United States of America, George W. Bush, as June 3, 2001 and in subsequent years on the first Sunday in June. In 2003, he proclaimed June 1. In 2004, he proclaimed June 6. In 2005, he proclaimed June 5. In 2006, he proclaimed June 4. In 2007, he proclaimed June 3. The White House Proclamation by the President of the United States of America, 2001

Nowhere in any of the proclamations did the President refer to the United Nations or the UN Resolution about Universal Child Day. The United States of America is one of only two countries in the world that have not ratified the United Nations Convention on the Rights of the Child. As of November 2007, 193 countries have ratified the United Nations Convention on the Rights of the Child, (UNCRC).

In 2007, Illinois Governor Rod R. Blagojevich issued a proclamation proclaiming the second Sunday in June as Children’s Day. The mayors of Aurora and Batavia, Illinois, also issued proclamations.[14]

In May 2009, International Children’s Day was celebrated at the Washington DC National Harborplace Hosted by the Ariel Foundation International and the Ariana-Leilani International Childrens Foundation. [15] [16] ” — http://en.wikipedia.org/wiki/Children%27s_Day

Come on! The most advanced country or the most conservative country? Can anyone really understand why we Americans are still using lbs, miles for not adapting The International System of Units (abbreviated SI from the French Le Système International d’Unités[1]), which is “the modern form of the metric system and is generally a system devised around the convenience of the number ten. It is the world’s most widely used system of measurement, both in everyday commerce and in science.” ?
— http://en.wikipedia.org/wiki/International_System_of_Units

“The website www.nationalchildrensday.us (mirror www.childrensday.us),an advocacy website that promotes the support of a national “Children’s Day” on the second Sunday in June (this year: June 14, 2009), is also joining the cause for after-school mentoring.” —
http://pdf.gospel-net.com/childrens_day_2009_release_4.pdf

God bless America and her children! Happy Children’s Day! 儿童节快乐！