Purpose
TO_DSINTERVAL() converts a string of the CHAR, VARCHAR2, NCHAR, or NVARCHAR2 data type to a value of the INTERVAL DAY TO SECOND data type. This function can be used to perform addition and subtraction operations on a datetime value.
Syntax
/*SQL date format*/
TO_DSINTERVAL ('[+ | -] days hours:minutes:seconds[.frac_secs]')
/*ISO date format*/
TO_DSINTERVAL ('[-] P[days D]
[T[hours H][minutes M][seconds[.frac_secs]S]]')
Parameters
| Parameter | Description |
|---|---|
| [+ | -]days hours:minutes:seconds[.frac_secs] | A string of the CHAR, VARCHAR2, NCHAR, or NVARCHAR2 data type in the acceptable format.
|
| [-] P[days D] [T[hours H][minutes M][seconds[.frac_secs]S] | A string of the CHAR, VARCHAR2, NCHAR, or NVARCHAR2 data type in the acceptable format. Notice: Blank spaces are not allowed in the value. |
| frac_secs | Optional. Specifies the fractional part of seconds. The value is an integer in the range of [0, 999999999]. |
Return type
The return type is INTERVAL DAY TO SECOND.
Examples
The following example returns the datetime value of
100days after November 11, 2021 in SQL format.obclient> SELECT TO_CHAR(TIMESTAMP '2021-11-11 00:00:00'+TO_DSINTERVAL('100 00:00:00'), 'YYYY-MM-DD HH24:MI:SS') "Time Stamp" FROM DUAL; +---------------------+ | Time Stamp | +---------------------+ | 2022-02-19 00:00:00 | +---------------------+ 1 row in setThe following example returns the datetime value of
100days and10hours after December 12, 2021 in ISO format.obclient> SELECT TO_CHAR(TIMESTAMP '2021-11-11 00:00:00'+TO_DSINTERVAL('P100DT5H'), 'YYYY-MM-DD HH24:MI:SS') "Time Stamp" FROM DUAL; +---------------------+ | Time Stamp | +---------------------+ | 2022-02-19 05:00:00 | +---------------------+ 1 row in set
