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*   [Get started](/v0.1/docs/get_started/)
    
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            *   [Output Parser Types](/v0.1/docs/modules/model_io/output_parsers/types/)
                
                *   [String output parser](/v0.1/docs/modules/model_io/output_parsers/types/string/)
                *   [HTTP Response Output Parser](/v0.1/docs/modules/model_io/output_parsers/types/http_response/)
                *   [JSON Output Functions Parser](/v0.1/docs/modules/model_io/output_parsers/types/json_functions/)
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                *   [Combining output parsers](/v0.1/docs/modules/model_io/output_parsers/types/combining_output_parser/)
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                *   [XML output parser](/v0.1/docs/modules/model_io/output_parsers/types/xml/)
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*   [](/v0.1/)
*   [Modules](/v0.1/docs/modules/)
*   [Model I/O](/v0.1/docs/modules/model_io/)
*   [Output Parsers](/v0.1/docs/modules/model_io/output_parsers/)
*   [Output Parser Types](/v0.1/docs/modules/model_io/output_parsers/types/)
*   Datetime parser

Datetime parser
===============

This OutputParser can be used to parse LLM output into datetime format.

tip

See [this section for general instructions on installing integration packages](/v0.1/docs/get_started/installation/#installing-integration-packages).

*   npm
*   Yarn
*   pnpm

    npm install @langchain/openai

    yarn add @langchain/openai

    pnpm add @langchain/openai

    import { ChatOpenAI } from "@langchain/openai";import { ChatPromptTemplate } from "@langchain/core/prompts";import { DatetimeOutputParser } from "langchain/output_parsers";const parser = new DatetimeOutputParser();const prompt = ChatPromptTemplate.fromTemplate(`Answer the users question:{question}{format_instructions}`);const promptWithInstructions = await prompt.partial({  format_instructions: parser.getFormatInstructions(),});const model = new ChatOpenAI({ temperature: 0 });const chain = promptWithInstructions.pipe(model).pipe(parser);const response = await chain.invoke({  question: "When was Chicago incorporated?",});console.log(response, response instanceof Date);/*  1837-03-04T00:00:00.000Z, true*/

#### API Reference:

*   [ChatOpenAI](https://api.js.langchain.com/classes/langchain_openai.ChatOpenAI.html) from `@langchain/openai`
*   [ChatPromptTemplate](https://api.js.langchain.com/classes/langchain_core_prompts.ChatPromptTemplate.html) from `@langchain/core/prompts`
*   [DatetimeOutputParser](https://api.js.langchain.com/classes/langchain_output_parsers.DatetimeOutputParser.html) from `langchain/output_parsers`

* * *

#### Help us out by providing feedback on this documentation page:

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