ProvisionOptionRelevantUnderlyingDateUnadjusted

The unadjusted date on the underlying set by the exercise of an option. What this date is depends on the option (e.g. in a swaption it is the swap effective date, in an extendible/cancelable provision it is the swap termination date).期权行使所依据的原始数据集之未经调整的日期。此日期的确定取决于期权类型（例如，在掉期期权中，其为掉期生效日期；在可延期/可取消条款中，其为掉期终止日期）。