# last_day — DuckDB 1.3.2 Returns the last day of the month - Reference: /products/haybarn/functions/releases/duckdb-1.3.2/last_day/ - JSON: /products/haybarn/functions/api/v1/duckdb-1.3.2/functions/last_day.json - Snapshot ID: duckdb-1.3.2 - Engine: duckdb v1.3.2 - Source ID: 0b83e5d2f6 - Binary SHA-256: 9a2ae2a4d5dbd07a5b0cb30c502d65014825d34924c681eb3faa7647e7cd2b6f - Captured: 2026-09-05T18:37:33.818Z - Source: https://github.com/duckdb/duckdb/releases/tag/v1.3.2 - Loaded extensions: autocomplete, core_functions, icu, json, parquet, shell ## Interpretation - Choose a snapshot matching the target engine and build. The default is captured from the published Haybarn WASM package used by the browser playground. Historical native snapshots are also available. - Availability is an observation in the recorded build and extension profile, not a guarantee of support in every installation or in WASM. - Types and descriptions are declarations from duckdb_functions(). Binding can specialize result types. Null means not supplied by the catalog; do not invent defaults, optionality, argument mode, or table output columns. - Raw parameter arrays preserve catalog order for scalar/aggregate/macro functions. Raw table arguments are alphabetical. Use callingConvention for engine-confirmed positional order and named arguments; null modes are unrecorded. Named does not mean optional. Macro defaults and special named variadic behavior are not supplied by duckdb_functions(). - Catalog examples are source material and may require data or extensions. runnableExamples contains separately verified SQL for the pinned WASM package; sample-data adaptations and guide examples are labeled separately. - Guide annotations and recipes are separate editorial content. The browser runner always uses Haybarn WASM 1.5.5-rc3, independently of the documentation snapshot. - All URLs beginning with / are relative to the origin hosting this document. Exports require no JavaScript, cookies, API key, or browser engine. ## Overloads ### overload-6ffadfe49a6b2701 Kind: scalar. Parameter order: catalog-order. ```text last_day(ts: DATE) → DATE ``` Link: /products/haybarn/functions/releases/duckdb-1.3.2/last_day/#overload-6ffadfe49a6b2701 | Argument | Catalog type | Calling mode | | --- | --- | --- | | ts | DATE | not recorded | Declared return type: DATE. Variadic argument type: none declared. Stability: CONSISTENT. Declared side effects: false. ### overload-2637a52348ea8e38 Kind: scalar. Parameter order: catalog-order. ```text last_day(ts: TIMESTAMP) → DATE ``` Link: /products/haybarn/functions/releases/duckdb-1.3.2/last_day/#overload-2637a52348ea8e38 | Argument | Catalog type | Calling mode | | --- | --- | --- | | ts | TIMESTAMP | not recorded | Declared return type: DATE. Variadic argument type: none declared. Stability: CONSISTENT. Declared side effects: false. ### overload-269c0489cd4e6abf Kind: scalar. Parameter order: catalog-order. ```text last_day(ts: TIMESTAMP WITH TIME ZONE) → DATE ``` Link: /products/haybarn/functions/releases/duckdb-1.3.2/last_day/#overload-269c0489cd4e6abf | Argument | Catalog type | Calling mode | | --- | --- | --- | | ts | TIMESTAMP WITH TIME ZONE | not recorded | Declared return type: DATE. Variadic argument type: none declared. Stability: CONSISTENT. Declared side effects: false. ## Guide recipes No guide recipes. ## Engine catalog examples Source examples may require additional data or extensions. Expressions are wrapped in SELECT; execution verification is not recorded. Reported for: overload-6ffadfe49a6b2701, overload-2637a52348ea8e38, overload-269c0489cd4e6abf ```sql SELECT last_day(TIMESTAMP '1992-03-22 01:02:03.1234'); ``` ## Runnable examples Executed successfully in Haybarn WASM 1.5.5-rc3. Sample data and guide examples are separate from the original catalog. ```sql SELECT last_day(TIMESTAMP '1992-03-22 01:02:03.1234'); ``` ## Additional DuckDB documentation - [Date Functions](https://duckdb.org/docs/current/sql/functions/date#last_daydate) - [Timestamp Functions](https://duckdb.org/docs/current/sql/functions/timestamp#last_daytimestamp) - [Timestamp with Time Zone Functions](https://duckdb.org/docs/current/sql/functions/timestamptz#last_daytimestamptz) ## In other engines ### Apache Spark: months_between() Uses last_day as part of a larger rewrite. Apache Spark: ```sql SELECT MONTHS_BETWEEN('1997-02-28 10:30:00', '1996-10-30') ``` Haybarn / DuckDB: ```sql SELECT DATE_DIFF('MONTH', CAST('1996-10-30' AS DATE), CAST('1997-02-28 10:30:00' AS DATE)) + CASE WHEN DAY(CAST('1997-02-28 10:30:00' AS DATE)) = DAY(LAST_DAY(CAST('1997-02-28 10:30:00' AS DATE))) AND DAY(CAST('1996-10-30' AS DATE)) = DAY(LAST_DAY(CAST('1996-10-30' AS DATE))) THEN 0 ELSE (DAY(CAST('1997-02-28 10:30:00' AS DATE)) - DAY(CAST('1996-10-30' AS DATE))) / 31.0 END ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_spark.py#L641). ### BigQuery BigQuery: ```sql SELECT LAST_DAY(CAST('2008-11-25' AS DATE), MONTH) ``` Haybarn / DuckDB: ```sql SELECT LAST_DAY(CAST('2008-11-25' AS DATE)) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_bigquery.py#L809). ### Presto Presto: ```sql SELECT LAST_DAY_OF_MONTH(CAST('2008-11-25' AS DATE)) ``` Haybarn / DuckDB: ```sql SELECT LAST_DAY(CAST('2008-11-25' AS DATE)) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_presto.py#L810). ### SQL Server SQL Server: ```sql EOMONTH(GETDATE()) ``` Haybarn / DuckDB: ```sql LAST_DAY(CAST(CURRENT_TIMESTAMP AS DATE)) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_tsql.py#L2147). ### Snowflake Snowflake: ```sql LAST_DAY(CAST('2023-04-15' AS DATE)) ``` Haybarn / DuckDB: ```sql LAST_DAY(CAST('2023-04-15' AS DATE)) ``` Translation from [SQLGlot](https://github.com/tobymao/sqlglot/blob/3086608e6fd4c41c02dfba47171608d2b193fce2/tests/dialects/test_snowflake.py#L2799). ## Observed availability | Snapshot | Observed | Overloads | JSON | | --- | --- | --- | --- | | haybarn-1.5.5-rc3 | present | 3 | [reference](/products/haybarn/functions/api/v1/haybarn-1.5.5-rc3/functions/last_day.json) | | duckdb-1.5.5 | present | 3 | [reference](/products/haybarn/functions/api/v1/duckdb-1.5.5/functions/last_day.json) | | duckdb-1.4.4 | present | 3 | [reference](/products/haybarn/functions/api/v1/duckdb-1.4.4/functions/last_day.json) | | duckdb-1.3.2 | present | 3 | [reference](/products/haybarn/functions/api/v1/duckdb-1.3.2/functions/last_day.json) | Engine catalog documentation is derived from MIT-licensed Haybarn and DuckDB. [Notices](/third-party-notices.txt).