plusAssign
Advances the current reading value of this time source by the specified duration .
duration
value is rounded down towards zero when converting it to a
Long
number of nanoseconds.
For example, if the duration being added is
0.6.nanoseconds
, the reading doesn't advance because
the duration value is rounded to zero nanoseconds.
Exceptions
IllegalStateException
- when the reading value overflows as the result of this operation.