This input amount is converted to a {@code Period} using {@code from(TemporalAmount)}. This operates separately on the years, months and days.
For example, "1 year, 6 months and 3 days" minus "2 years, 2 months and 2 days" returns "-1 years, 4 months and 1 day".
This instance is immutable and unaffected by this method call. @param amountToSubtract the period to subtract, not null @return a {@code Period} based on this period with the requested period subtracted, not null @throws ArithmeticException if numeric overflow occurs
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