Does this transition represent a gap _in the local time-line.
!(p)
Gaps occur where there are local date-times that simply do not exist.
An example would be when the offset changes from {@code +01:00} to {@code +02:00}.
This might be described as 'the clocks will move forward one hour tonight at 1am'.
@return true if this transition is a gap, false if it is an overlap
Does this transition represent a gap _in the local time-line. !(p) Gaps occur where there are local date-times that simply do not exist. An example would be when the offset changes from {@code +01:00} to {@code +02:00}. This might be described as 'the clocks will move forward one hour tonight at 1am'.
@return true if this transition is a gap, false if it is an overlap