Important National and International Days

Koninginnedag (Queen's Day) was celebrated on April 30th to honor the Queen's birthday - Queen Juliana's birthday was on April 30, and the tradition continued under Queen Beatrix. Since 2014, after Willem-Alexander became King, it's now celebrated as King's Day on his birthday, April 27.

World Environment Day is an annual observance established by the United Nations to raise awareness about environmental protection. It has been consistently celebrated on June 5th since 1973, when it was first established by the UN General Assembly.

International Literacy Day (officially called International Literacy Day, not World Literacy Day) is observed annually on September 8th. It was proclaimed by UNESCO in 1966 to remind the international community of the importance of literacy.

South Korea celebrates its Independence Day on August 15th, 1945, marking liberation from Japanese colonial rule after World War II. This date coincides with India's Independence Day as well. July 4th is US Independence Day.

The correct name uses singular possessive 'Mother's Day' (apostrophe before s) as it honors motherhood as a concept, not multiple mothers. 'Mothers' Day' with apostrophe after s would incorrectly imply a day belonging to multiple mothers grammatically.

Mother's Day is celebrated on different dates worldwide - most commonly the second Sunday of May in US/India, March in the UK, and various other dates in different countries. The correct answer acknowledges this regional variation rather than fixing a single universal date.

President Woodrow Wilson officially proclaimed Mother's Day as a national holiday in 1914, designating the second Sunday of May for the celebration. This followed Anna Jarvis's campaign to honor her mother and establish the holiday in the United States.

Surya Pongal is celebrated on the first day of the four-day Pongal festival. This day is dedicated to the Sun God and marks the beginning of the harvest celebrations in Tamil Nadu.

July is officially designated as National Ice Cream Month in the United States, established by Ronald Reagan in 1984. July was chosen because it's peak summer season when ice cream consumption is highest. The third Sunday of July is specifically celebrated as National Ice Cream Day.

South Korea's Independence Day, known as Gwangbokjeol (meaning "the day the light returned"), is celebrated on August 15th. This commemorates the liberation of Korea from Japanese colonial rule in 1945. The date is historically significant as it marks both the end of Japanese occupation and the beginning of the journey towards the establishment of the Republic of Korea.

World Environment Day is celebrated annually on June 5th since 1973. Established by the United Nations, it serves as the primary global platform for environmental awareness, encouraging action to protect our planet.

Human Rights Day is observed annually on December 10th to commemorate the adoption of the Universal Declaration of Human Rights by the United Nations General Assembly in 1948.

ANZAC Day is observed on April 25th in both Australia and New Zealand to commemorate the landing of ANZAC troops at Gallipoli in 1915 during World War I. It is a national holiday in both countries, honoring military service and sacrifice.

Two years have the same calendar if they're both common years or both leap years, and start on the same day. 2007 starts on Monday (common year). Checking forward: 2008 (+2 days, leap), 2009 (+1), 2010 (+1), 2011 (+1), 2012 (+1), 2013 (+2 from leap 2012, total +6 = Monday, common year). 2014 starts on Tuesday, so 2007's calendar repeats in 2014 (both common years starting on Monday after accounting for leap years).