Mozaffar ad-Din Shah Qajar signs the Persian Constitution of 1906.

Mozaffar ad-Din Shah Qajar was the fifth Qajar shah of Iran, reigning from 1896 until his death in 1907. He is often credited with the creation of the Persian Constitution of 1906, which he approved of in one of his final acts as shah.

The Persian Constitution of 1906, was the first constitution of the Sublime State of Iran (Persia) and a result of the Persian Constitutional Revolution. It was written by Hassan Pirnia, Hossein Pirnia, and Esmail Momtaz od-Dowleh, among others. The Constitution was also in effect during Pahlavi Iran. It is divided into five chapters with many articles that developed over several years. The Quran was the foundation of the constitution while the Belgian constitution served as a partial model, which guaranteed each citizen equality before the law, and a safeguarding of personal honour, property and speech.

December 31 is the 365th day of the year in the Gregorian calendar. It is known by a collection of names including: Saint Sylvester's Day, New Year's Eve or Old Year's Day/Night, as the following day is New Year's Day. It is the last day of the year; the following day is January 1, the first day of the following year.