其他 - SAS中Oracle格式为J（Julian）的to_date

我对Oracle的Julian日期格式一无所知，但好像距SAS的“第0天”只有几天的距离。SAS中的第0天是01JAN1960，因此我们只需要计算Oracle系统（其中31DEC2013是第2456658天）和SAS系统（其中31DEC2013是22280）之间的偏移量：

data dates;
  time_key = 24566658; output;
  time_key = 24566689; output;
run;

* Calculate the offset, given 24566658 is 31-Dec-2013;
data _null_;
  call symput("offset", 24566658 - "31DEC2013"d);
run;

%put Offset from SAS dates to Oracle dates is &offset days;

data converted;
  set dates;
  * Adjust the Oracle date values by subtracting the calculated offset;
  sas_time_key_numeric = time_key - &offset;
  sas_time_key = put(time_key - &offset, date9.);
  put time_key= sas_time_key_numeric= sas_time_key=;
run;

输出为：

10   %put Offset from SAS dates to Oracle dates is &offset days;
Offset from SAS dates to Oracle dates is     24546935 days
11
12   data converted;
13     set dates;
14     sas_time_key_numeric = time_key - &offset;
15     sas_time_key = put(time_key - &offset, date9.);
16     put time_key= sas_time_key_numeric= sas_time_key=;
17   run;

time_key=24566658 sas_time_key_numeric=19723 sas_time_key=31DEC2013
time_key=24566689 sas_time_key_numeric=19754 sas_time_key=31JAN2014

给出正确的转换。

因此，魔数为24546935；从Oracle日期中减去该值，以获取相应的SAS日期值，然后应用所需的日期格式。