Generally, the Christian calendar and Christian churches recognize the IDL. Christmas for example, is celebrated on 25 December (according to either the Gregorian or the Julian calendar, depending upon which of the two is used by the particular church) as that date falls in countries located on either side of the Date Line. Thus, whether it is Western Christmas or Orthodox Christmas, Christians in Samoa, immediately west of the Date Line, will celebrate the holiday a day before Christians in "American" Samoa, which is immediately "east" of the Date Line.