Palm Sunday is the Sunday before Easter Sunday. Having said this, for Palm Sunday to have fallen on April 12th, it would mean that Easter would have fallen on April 19th of the same year.
According to records, the last time Easter Sunday fell on April 19th and Palm Sunday fell on April 12th was in 1992.
Here are a few of the dates I have found where Palm Sunday would have fallen on April 12th.
1908
1981
1987
1992
and the next date being 2071.
I have to add a bit more information on here, this is very interesting to me, I've started back in 1700 all the way up until the year 2299, and found these dates of Easter Sunday falling on April 19th, thus Palm Sunday being on the 12th.
1767
1772
1778
1829
1835
1840
1908
1981
1987
1992
2071
2076
2082
2133
2139
2144
2201
2207
2212
2291
2296
The next time Palm Sunday will fall on April 14 will be in 2019. The last time this has happened was in 1957.
Easter was on April 12th in the year 2009.
In 2009, Easter Sunday fell on April 12th and in 2008, Easter Sunday fell on March 23rd.
Palm Sunday, the Sunday before Easter, fell on April 5 in 1648.
In the Western world, Easter Sunday fell on April 12th.
The last time April 12 fell on a Sunday was 2009.
April 11th 2009 fell on a Saturday. I know this because Easter Sunday fell the next day - Sunday 12th April, 2009.
In 1903, Easter Sunday fell on April 12th.
In 1846, Easter Sunday fell on April 12th.
Easter Sunday fell on April 14th in 1974. This would make Good Friday the 12th April.
In 1982, Easter Sunday fell on April 11.
In 2004, Easter Sunday fell on April 11.
Easter Sunday fell on Sunday, 6th April 1980.