This time zone became the Local Mean Time in Davao Oriental and in easternmost areas of the Philippines from January 1, 1845, until May 10, 1899, by the virtue of Claveria's decree to reform the country calendar by skipping December 31, 1844, that redrew the International Date Line from being west of the country to go east and made the Philippines have same dates with the rest of Asia.
At that time, this zone became the Local Mean Time in Davao Oriental and easternmost areas of the Philippines from January 1, 1845, until May 10, 1899, as a result of Claveria's decree to reform the country calendar by skipping December 31, 1844, which altered the International Date Line's position from west of the country to east and synchronized the Philippines' dates with those in the rest of Asia.