Help Center> Data Lake Insight> Spark SQL Syntax Reference> Built-In Functions> Date Functions> lastday
Updated on 2023-10-25 GMT+08:00
View PDF

lastday

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);
Parent topic: Date Functions