Indian citizenship is usually acquired by birth and descent. According to the Constitution of India, which came into force on November 29, 1949, if a person's parents were born in India or have been in India for more than five years, he can be identified as a citizen of India. Under the Citizenship Act of 1955, citizenship is granted on the basis of date of birth. Those born in India from January 26, 1950, to July 1, 1966, are considered Indians by birth. Citizenship of a person born between December 3, 2004, will be granted Indian citizenship only if the parent is an Indian.