Which country attempted to adjust the International Date Line to maintain a same-day format across its territory?

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Kiribati is the country that made an effort to adjust the International Date Line to ensure that all of its islands would observe the same day. Prior to this change, some islands were on different days due to their positioning relative to the original line. In 1995, Kiribati modified the Date Line in such a way that all of its Gilbert Islands and Line Islands fell on the same side of the line, allowing the nation to operate on the same calendar day. This adjustment was significant for improving administrative efficiency and connectivity among the various islands in the nation.

Other options, while they may have unique time zone configurations or historical adjustments, did not undertake a large-scale modification of the International Date Line in the same manner as Kiribati. For instance, Samoa did shift its time zone in 2011 but did so to align itself more closely with its trading partners. Tuvalu and Fiji also have time zone considerations but did not modify the Date Line similarly to Kiribati.