The earliest Easter since 1913 has prompted the Roman Catholic Church to move St Patrick's Day from March 17 to March 15 as it discourages the celebration of feast days during Holy Week.
But the liturgial confusion has not hampered the local Irish community celebrating Ireland's patron saint.
Halifax Irish Club steward Peter Beck said there would be a mass in the club on Thursday, March 13, and a parade at the 11am Palm Sunday mass on March 16, at St Marie's, Gibbet Street.
And the club at West Parade had bands and dancing planned from the Thursday through to Monday.
"We are celebrating St Patrick's Day as usual," he said.
And the St Patrick's Day parade in Leeds will be held on Sunday, March 9.
Roman Catholic Dean of Halifax, Father Kevin Firth, of Sacred Heart and St Patrick's Bolton Brow, Sowerby Bridge, said his church would celebrate the feast of St Patrick on Friday, March 14, with a mass and parish social.
"Holy Week is the most important week of the year and nothing takes precedence over that," he said.
The last time St Patrick's Day had to be moved was in 1940 when it coincided with Palm Sunday, the first day of Holy Week.
The next date it will have to be moved again is 2160.
Easter Sunday falls on the first Sunday following the full moon on or after the spring equinox and can be from March 22 to April 25.