public static Boolean isOpportunityExistAndLastModifiedInSpecifiedTime(Id accountId,DateTime SpecifiedTime) {

    // 查询Account的IsExpired字段

    Account acc = [SELECT Id, IsExpired__c

                   FROM Account

                   WHERE Id = :accountId];

    // 获取Opportunity中与Account相关的所有Opportunity记录

    List<Opportunity> oppList = [SELECT Id, LastModifiedDate

                                 FROM Opportunity

                                 WHERE AccountId = :accountId];

    // 如果有Opportunity记录

    if (!oppList.isEmpty()) {

        // 查找Opportunity中最晚的LastModifiedDate

        DateTime latestModifiedDate = oppList[0].LastModifiedDate;

        for (Opportunity opp : oppList) {

            if (opp.LastModifiedDate > latestModifiedDate) {

                latestModifiedDate = opp.LastModifiedDate;

            }

        }

        // 判断最晚的LastModifiedDate是否距离今天超过6个月

        DateTime sixMonthsAgo = System.now().addMonths(-6);

        if (latestModifiedDate > sixMonthsAgo) {

            return true;//LastModifiedDate在6个月内

        }

    }

    return false;

}