docs/en/sql-reference/sql-functions/date-time-functions/days_add.md
Adds a specified number of days to a given date or date time.
DATETIME days_add(DATETIME|DATE date, INT n);
date: a DATE or DATETIME expression.
n: the number of days to add.
Returns a DATETIME value.
If any input parameter is NULL or invalid, NULL is returned.
If the output date exceeds the range of [0000-01-01 00:00:00, 9999-12-31 00:00:00], NULL is returned.
select days_add('2023-10-31 23:59:59', 1);
+------------------------------------+
| days_add('2023-10-31 23:59:59', 1) |
+------------------------------------+
| 2023-11-01 23:59:59 |
+------------------------------------+
select days_add('2023-10-31 23:59:59', 1000);
+---------------------------------------+
| days_add('2023-10-31 23:59:59', 1000) |
+---------------------------------------+
| 2026-07-27 23:59:59 |
+---------------------------------------+
select days_add('2023-10-31', 1);
+---------------------------+
| days_add('2023-10-31', 1) |
+---------------------------+
| 2023-11-01 00:00:00 |
+---------------------------+
DAY,day