Returns a copy of this duration with the specified duration _in standard 24 hour days subtracted.
!(p)
The number of days is multiplied by 86400 to obtain the number of seconds to subtract.
This is based on the standard definition of a day as 24 hours.
!(p)
This instance is immutable and unaffected by this method call.
@param daysToSubtract the days to subtract, positive or negative
@return a {@code Duration} based on this duration with the specified days subtracted, not null
@throws ArithmeticException if numeric overflow occurs
Returns a copy of this duration with the specified duration _in standard 24 hour days subtracted. !(p) The number of days is multiplied by 86400 to obtain the number of seconds to subtract. This is based on the standard definition of a day as 24 hours. !(p) This instance is immutable and unaffected by this method call.
@param daysToSubtract the days to subtract, positive or negative @return a {@code Duration} based on this duration with the specified days subtracted, not null @throws ArithmeticException if numeric overflow occurs