Abstract
<jats:p>The article presents an analysis of the calendar reform in the Ukrainian Greek-Catholic Church as a complex historical, theological, and pastoral phenomenon. It has been shown that, throughout the 20th and early 21st centuries, the church calendar served not only a liturgical function but also an identity-forming role, acting as a marker of Eastern Christian liturgical tradition and national distinctiveness. Particular attention is given to the factors that prompted the calendar reform in the context of globalization, mass migration of Ukrainians, and the Russian-Ukrainian war. The study analyzes the decisions of the 2023 Synod of Bishops of the Ukrainian Greek-Catholic Church and their impact on the activities of Ukrainian Greek-Catholic parishes in Canada, Italy, and the United Kingdom. The purpose of the article is to examine the calendar reform in the Ukrainian Greek-Catholic Church as a significant factor in the development of church life under contemporary conditions. The research methodology is based on an interdisciplinary approach. The scientific novelty of the article lies in the comprehensive interpretation of the Ukrainian Greek-Catholic Church calendar reform as a factor in the transformation of church identity. Special attention is paid to the particularities of implementing the calendar reform in Greek-Catholic parishes abroad. It is demonstrated that the calendar reform in the Ukrainian Greek-Catholic Church is gradual and aims to adapt liturgical practice to contemporary conditions without breaking from the Eastern Christian tradition.</jats:p>