格林时间转换成正常时间

 uscdbmt@rac1:~> date +%s
1414741902

oracle中怎么把这个1414741902转换成正常时间格式

 

select Numtodsinterval(1414741902+TO_NUMBER(SUBSTR(TZ_OFFSET(sessiontimezone), 1, 3)) * 3600, \'second\')+to_date(\'1970-1-1\', \'yyyy/mm/dd\') from dual;
        
 select Numtodsinterval(1414741902-8*3600, \'second\')+to_date(\'1970-1-1\', \'yyyy/mm/dd\') from dual;   

 

 

当前时间转换成格林尼治时间：

 select (to_number(to_date(\'2014/10/31 15:51:42\',\'yyyy/mm/dd hh24:mi:ss\') - to_date(\'19700101\',\'yyyymmdd\')) * 86400)-TO_NUMBER(SUBSTR(TZ_OFFSET(sessiontimezone), 1, 3))* 3600 from dual;