来自 Oracle 的 xml 中的日期时间格式

Question

I have a simple requirement to display a time field as a Datetime in xml when converted from excel. Being new to Oracle field, I'm stuck with a few questions

1. When I run the below query in Oracle my value is displayed as 31-DEC-99 07.45.30.000000000

   select to_timestamp('1899-12-31 07:45:30', 'yyyy-mm-dd hh:mi:ss') as res from dual;

Now,I understand that my NLS_DATE_FORMAT = 'DD-MON-RR' and hence the date is shown as 31-DEC-99 but why is the time shown as hh.mm.ss.ffff rather than hh:mm:ss:ffff

2. Is this the reason that when I download this simple file from oracle to excel and convert to xml, the datatype is show as string rather than datetime . I tried a similar exercise directly on excel and we can see the value as datetime on xml but this doesnt work with excel downloaded from oracle. Where am I going wrong?

Just to confirm, my requirement here is to get a timestamp displayed in excel properly when downloaded from oracle table and display the same as a datetime field when I open in xml

Answer 1

Is this concerning a BI/XML Publisher report? If so, you need to do something like this to your dates in your data definition:

TO_CHAR(ORDERED_DATE,'MM-DD-YYYY  HH24:MI:SS') ORDERED_DATE

Answer 2

Realised it was the NLS_DATETIME_FORMAT that I had to worry about. Changed that for my session and worked like a charm.