Display Current Date on Heading Title (TTITLE)

Question

I am using sql*plus to write a report. I would like for the current date (and time if possible) to be displayed in the title of my report (TTITLE.) It appears that I'm supposed to use a system variable called, _DATE, but I'm not sure what to do.  I'm running sql*plus v.10.2.
Here is my code. How can I include the current date to be displayed in the "RIGHT" side of the TTITLE heading?
TTITLE ON
TTITLE LEFT 'MY COMPANY' CENTER 'Weekly Invoice Totals for Cost Center: 10 - MANAGEMENT' RIGHT 'Date: '
set pagesize 66
set linesize 120
set wrap off
column vendor_name heading 'Supplier' format a40
column invoice_num heading 'Invoice Number' format a30
column invoice_amount heading 'Invoice Amount' format 999,999,999.99
set underline =
compute sum label TOTAL of invoice_amount on vendor_name
break on vendor_name skip 2
SELECT
po_v.vendor_name,
ap_inv.invoice_num,
ap_inv.invoice_amount,
FROM
ap.ap_invoices_all ap_inv,
po.po_vendors po_v,
WHERE
ap_inv.vendor_id = po_v.vendor_id and
ap_inv.creation_date > SYSDATE-10;

Answer 1

Hi,
Define a substitution variable, then use that variable in your TTITLE statement:
COLUMN     report_date_col     NEW_VALUE  report_date
SELECT     TO_CHAR ( SYSDATE
          , 'DD-Mon-YYYY'
          )     AS report_date_col
FROM     dual
TTITLE LEFT 'MY COMPANY' CENTER 'Weekly Invoice Totals for Cost Center: 10 - MANAGEMENT' RIGHT 'Date: &report_date' SQL*Plus can't execute functions (like SYSDATE).
To get function results into a substitution variable, you can use the COLUMN ... NEW_VALUE command, as shown above, then call the function in a query.
Note that both the substitution variable and the title are static. That is, if you include the hours-minutes-seconds in the format, and run the SELECT statement at 17:00:00, then execute the TTITLE command at 17:00:05, and run reports at 17:01:00, 17:02:00 and 17:03:00, the title on all the reports will say 17:00:00.