Francis closed his blessing noting that all Christians this year [2017] celebrate Easter on the same date- a rare occurrence since different churches use different calendars.
“With one voice, in every part of the world, we proclaim the great message: ‘The Lord is truly risen, as he said!’ May Jesus, who vanquished the darkness of sin and death, grant peace to our days.”
Source: Pope Francis - Quoted by Inés San Martín in "‘The resurrection is not a fantasy,’ Pope Francis insists on Easter Sunday", Crux, 16 April 2017, https://cruxnow.com/vatican/2017/04/16/resurrection-not-fantasy-pope-francis-insists-easter-sunday/