A transition between two offsets caused by a discontinuity _in the local time-line. !(p) A transition between two offsets is normally the result of a daylight savings cutover. The discontinuity is normally a gap _in spring and an overlap _in autumn. {@code ZoneOffsetTransition} models the transition between the two offsets. !(p) Gaps occur where there are local date-times that simply do not exist. An example would be when the offset changes from {@code +03:00} to {@code +04:00}. This might be described as 'the clocks will move forward one hour tonight at 1am'. !(p) Overlaps occur where there are local date-times that exist twice. An example would be when the offset changes from {@code +04:00} to {@code +03:00}. This might be described as 'the clocks will move back one hour tonight at 2am'.