plus
operator fun <Unit : NanosecondOrBigger, TimeUnit> TimePeriod<TimeUnit.Nanosecond>.plus(difference: TimeDifference<Unit>): TimePeriod<TimeUnit.Nanosecond>
operator fun <Unit : SecondOrBigger, TimeUnit> TimePeriod<TimeUnit.Second>.plus(difference: TimeDifference<Unit>): TimePeriod<TimeUnit.Second>
operator fun <Unit : MinuteOrBigger, TimeUnit> TimePeriod<TimeUnit.Minute>.plus(difference: TimeDifference<Unit>): TimePeriod<TimeUnit.Minute>
operator fun <Unit : HourOrBigger, TimeUnit> TimePeriod<TimeUnit.Hour>.plus(difference: TimeDifference<Unit>): TimePeriod<TimeUnit.Hour>
operator fun <Unit : DayOrBigger, TimeUnit> TimePeriod<TimeUnit.Day>.plus(difference: TimeDifference<Unit>): TimePeriod<TimeUnit.Day>
operator fun <Unit : MonthOrBigger, TimeUnit> TimePeriod<TimeUnit.Month>.plus(difference: TimeDifference<Unit>): TimePeriod<TimeUnit.Month>
operator fun TimePeriod<TimeUnit.Year>.plus(difference: TimeDifference<TimeUnit.Year>): TimePeriod<TimeUnit.Year>
Adds a TimeDifference to this TimePeriod.