TO_CHAR (datetime)

Syntax

to_char_date::=

Text description of to_char_date

Purpose

TO_CHAR (datetime) converts date of DATE, TIMESTAMP, TIMESTAMP WITH TIME ZONE, or TIMESTAMP WITH LOCAL TIME ZONE datatype to a value of VARCHAR2 datatype in the format specified by the date format fmt. If you omit fmt, then date is converted to a VARCHAR2 value as follows:

• DATE is converted to a value in the default date format.
• TIMESTAMP and TIMESTAMP WITH LOCAL TIME ZONE are converted to values in the default timestamp format.
• TIMESTAMP WITH TIME ZONE is converted to a value in the default timestamp with time zone format.

The 'nlsparams' specifies the language in which month and day names and abbreviations are returned. This argument can have this form:

'NLS_DATE_LANGUAGE = language' 

If you omit 'nlsparams', then this function uses the default date language for your session.

Examples

The following example uses this table:

CREATE TABLE date_tab (
   ts_col      TIMESTAMP,
   tsltz_col   TIMESTAMP WITH LOCAL TIME ZONE,
   tstz_col    TIMESTAMP WITH TIME ZONE);

The example shows the results of applying TO_CHAR to different TIMESTAMP datatypes. The result for a TIMESTAMP WITH LOCAL TIME ZONE column is sensitive to session time zone, whereas the results for the TIMESTAMP and TIMESTAMP WITH TIME ZONE columns are not sensitive to session time zone:

ALTER SESSION SET TIME_ZONE = '-8:00';
INSERT INTO date_tab VALUES (  
   TIMESTAMP'1999-12-01 10:00:00',
   TIMESTAMP'1999-12-01 10:00:00',
   TIMESTAMP'1999-12-01 10:00:00');
INSERT INTO date_tab VALUES (
   TIMESTAMP'1999-12-02 10:00:00 -8:00', 
   TIMESTAMP'1999-12-02 10:00:00 -8:00',
   TIMESTAMP'1999-12-02 10:00:00 -8:00');

SELECT TO_CHAR(ts_col, 'DD-MON-YYYY HH24:MI:SSxFF'),
   TO_CHAR(tstz_col, 'DD-MON-YYYY HH24:MI:SSxFF TZH:TZM')
   FROM date_tab;

TO_CHAR(TS_COL,'DD-MON-YYYYHH2 TO_CHAR(TSTZ_COL,'DD-MON-YYYYHH24:MI:
------------------------------ -------------------------------------
01-DEC-1999 10:00:00           01-DEC-1999 10:00:00.000000 -08:00
02-DEC-1999 10:00:00           02-DEC-1999 10:00:00.000000 -08:00

SELECT SESSIONTIMEZONE, 
   TO_CHAR(tsltz_col, 'DD-MON-YYYY HH24:MI:SSxFF')
   FROM date_tab;

SESSIONTIMEZONE  TO_CHAR(TSLTZ_COL,'DD-MON-YYYY
---------------  ------------------------------
-08:00           01-DEC-1999 10:00:00.000000
-08:00           02-DEC-1999 10:00:00.000000

ALTER SESSION SET TIME_ZONE = '-5:00';
SELECT TO_CHAR(ts_col, 'DD-MON-YYYY HH24:MI:SSxFF'),
   TO_CHAR(tstz_col, 'DD-MON-YYYY HH24:MI:SSxFF TZH:TZM')
   FROM date_tab;

TO_CHAR(TS_COL,'DD-MON-YYYYHH2 TO_CHAR(TSTZ_COL,'DD-MON-YYYYHH24:MI:
------------------------------ -------------------------------------
01-DEC-1999 10:00:00.000000    01-DEC-1999 10:00:00.000000 -08:00
02-DEC-1999 10:00:00.000000    02-DEC-1999 10:00:00.000000 -08:00

SELECT SESSIONTIMEZONE,
   TO_CHAR(tsltz_col, 'DD-MON-YYYY HH24:MI:SSxFF') 
   FROM date_tab;

SESSIONTIMEZONE           TO_CHAR(TSLTZ_COL,'DD-MON-YYYY
------------------------- ------------------------------
-05:00                    01-DEC-1999 13:00:00.000000
-05:00                    02-DEC-1999 13:00:00.000000