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

This function is used to return the last day of the month a date belongs to.

Similar function: lastday. The lastday 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.

Syntax

last_day(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 DATE type, in the yyyy-mm-dd 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 last_day('2023-08-15');

The value 2023-08-31 is returned.

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

The value NULL is returned.

 select last_day('20230810');
Parent topic: Date Functions