This function is used to return the last day of the month a date belongs to. The hour, minute, and second part is 00:00:00.

Similar function: last_day. The last_day function is used to return the last day of the month a date belongs to. The return value is in the yyyy-mm-dd format.

Syntax

lastday(string date)

Parameters

**Table 1** Parameter
Parameter	Mandatory	Type	Description
date	Yes	DATE or STRING	Date that needs to be processed The following formats are supported: yyyy-mm-dd yyyy-mm-dd hh:mi:ss yyyy-mm-dd hh:mi:ss.ff3

Return Values

The return value is of the STRING type, in the yyyy-mm-dd hh:mi:ss format.

If the value of date is not of the DATE or STRING type, the error message "data type mismatch" is displayed.
If the value of date is of the DATE or STRING type but is not in one of the supported formats, NULL is returned.
If the value of date is NULL, NULL is returned.

Example Code

The value 2023-08-31 is returned.

 select lastday('2023-08-10');

The value 2023-08-31 00:00:00 is returned.

 select lastday ('2023-08-10 10:54:00');

The value NULL is returned.

 select lastday (null);