Using Western dates, it hasn't. The last Easter Sunday on March 23 was in 1913, and will be again in 2008.
Easter Sunday 1968 was April 14
In 2005, Easter Sunday fell on March 27th.
Easter Sunday in 1951 was March 25th
Easter was on April 17th in 1960
In 1988, Easter Sunday fell on April 3.
In 1967, Easter Sunday fell on March 26th.
Easter Sunday fells on 23 March 2008 for the Western Christians (Catholics, Protestants). For the Eastern Orthodox Christians, Easter Sunday was on 27 April 2008.
In 1989, Easter Sunday fell on March 26th.
Easter Sunday fell on March 29 in 1964.
In 1872, Easter Sunday fell on March 31st.
In the Western world, Easter Sunday fell on March 24th in the year 1940.
In 1929, Easter Sunday fell on March 31. Easter Monday then fell on April 1 and Good Friday fell on March 29.