Does this transition represent an overlap _in the local time-line.
!(p)
Overlaps occur where there are local date-times that exist twice.
An example would be when the offset changes from {@code +02:00} to {@code +01:00}.
This might be described as 'the clocks will move back one hour tonight at 2am'.
@return true if this transition is an overlap, false if it is a gap
Does this transition represent an overlap _in the local time-line. !(p) Overlaps occur where there are local date-times that exist twice. An example would be when the offset changes from {@code +02:00} to {@code +01:00}. This might be described as 'the clocks will move back one hour tonight at 2am'.
@return true if this transition is an overlap, false if it is a gap