On 24 December 2022, during an audience, Major archbishop Sviatoslav handed over to Metropolitan Epiphanius for review a letter outlining the considerations of the UGCC hierarchs regarding the . The primates decided to create a joint working group on specific proposals for calendar reform. The joint group is initiated on the occasion of the celebration of the 1700th anniversary of the First Ecumenical Council, held in Nicaea in 325. In this Council, in particular, the calendar principles of church life were determined.
