Skip to main content

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.

npm install @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: