“The Unchangeable Sabbath and Changeable Civil Day Names: A Biblical-Theological Study of Tonga’s Date-Line Context”

Abstract

This article examines the theological question posed by Seventh-day Adventist Sabbath observance in Tonga, where the period 
historically observed as the seventh-day Sabbath is known in civil life as Sunday. It argues that the Sabbath’s identity is established by God’s creative sanctification and the biblical six-plus-one sequence, not by a universal civil weekday label. The study follows a biblical-theological method, placing the creation narrative, the manna account, the Decalogue, the prophets, Jesus’ Sabbath teaching, and the Passion-week sequence in conversation with the history of civil timekeeping and the International Date Line. It then considers Tonga as a focused South Pacific test case. The article does not offer a linguistic study of Tongan terminology or a pastoral programme for congregational conflict. Its narrower contribution is doctrinal: it distinguishes sacred sequence from civil nomenclature. It argues that civil calendars coordinate public life without acquiring authority to sanctify, desanctify, or transfer the seventh-day Sabbath. On 
this account, the civil name Sunday in Tonga does not, by itself, establish first-day sacredness. The relevant theological question is whether the worshipping community preserves the biblical seventh-day rhythm in its local reckoning. The Tonga case therefore clarifies, rather than dissolves, the Adventist distinction between God-given sacred time and humanly administered civil time.