Transforming a string such as "202309101010" into a date entity

Question

Transforming a string such as "202309101010" into a date entity

Need to convert a string in the format "YYYYMMDDHHMM" (e.g. "202309101010") into a Date object in TypeScript?

Check out this code snippet for converting the string:

const dateString: string = "202309101010"; 
const year: number = parseInt(dateString.substring(0, 4), 10); 
const month: number = parseInt(dateString.substring(4, 6), 10); 
const day: number = parseInt(dateString.substring(6, 8), 10); 
const hour: number = parseInt(dateString.substring(8, 10), 10); 
const minute: number = parseInt(dateString.substring(10, 12), 10); 

const formattedDate: Date = new Date(year, month - 1, day, hour, minute); 
console.log(formattedDate);

If you're looking for a more elegant or efficient solution, consider exploring built-in TypeScript or JavaScript functions that may simplify the conversion process. Are there any alternative methods available that can handle this conversion task with more gracefulness? Let's find out!

typescript

Answer 1

Answer №1

The ECMAScript specification outlines the process for creating a Date object from a string in the following manner:

The initial step involves attempting to parse the String based on the format specified in the Date Time String Format (21.4.1.32), which includes expanded years. If the String does not adhere to that format, the function may resort to implementation-specific heuristics or formats. Strings that cannot be recognized or contain out-of-bounds format elements will result in this function returning NaN.

The "Date Time String Format" mentioned is structured as YYYY-MM-DDTHH:mm:ss.sssZ, and it differs from the format being used in your string. Therefore, if you intend to construct a Date object with defined behavior, the correct approach is to extract its individual components first and then pass them separately into the Date constructor.

Regarding the extraction process, your current method is effective and does not require modification unless issues arise.

However, an alternative method that could be considered is using a regular expression. This approach can validate whether your string has the correct format and simultaneously extract its parts as strings (not numbers) through a single call of match:

function toDate(dateString: string): Date {
    const dateStringPattern = /^(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})$/;

    const [match, ...parts] = dateString.match(dateStringPattern) ?? [];
    if (!match) {
        // Handle this error somehow
        throw new Error(`Incorrectly formatted string: '${dateString}'`)
    }

    const [year, month, day, hour, minute] = parts.map((part) => parseInt(part, 10));
    const formattedDate: Date = new Date(year, month - 1, day, hour, minute); 
    return formattedDate;
}

console.log(toDate('202309101010'));
try {
    console.log(toDate('abc')); // Throws an error
} catch (e) {
    console.error(e);
}

TypeScript Playground

Answer 2

The ECMAScript specification outlines the process for creating a Date object from a string in the following manner:

The initial step involves attempting to parse the String based on the format specified in the Date Time String Format (21.4.1.32), which includes expanded years. If the String does not adhere to that format, the function may resort to implementation-specific heuristics or formats. Strings that cannot be recognized or contain out-of-bounds format elements will result in this function returning NaN.

The "Date Time String Format" mentioned is structured as YYYY-MM-DDTHH:mm:ss.sssZ, and it differs from the format being used in your string. Therefore, if you intend to construct a Date object with defined behavior, the correct approach is to extract its individual components first and then pass them separately into the Date constructor.

Regarding the extraction process, your current method is effective and does not require modification unless issues arise.

However, an alternative method that could be considered is using a regular expression. This approach can validate whether your string has the correct format and simultaneously extract its parts as strings (not numbers) through a single call of match:

function toDate(dateString: string): Date {
    const dateStringPattern = /^(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})$/;

    const [match, ...parts] = dateString.match(dateStringPattern) ?? [];
    if (!match) {
        // Handle this error somehow
        throw new Error(`Incorrectly formatted string: '${dateString}'`)
    }

    const [year, month, day, hour, minute] = parts.map((part) => parseInt(part, 10));
    const formattedDate: Date = new Date(year, month - 1, day, hour, minute); 
    return formattedDate;
}

console.log(toDate('202309101010'));
try {
    console.log(toDate('abc')); // Throws an error
} catch (e) {
    console.error(e);
}

TypeScript Playground

Answer 3

Answer №2

To handle date and time, you can utilize moment.js to parse the string in this manner:

moment('202309101010', 'YYYYMMDDhhmmss').format()

Alternatively,

You can explore date-fns library at this link

var parse = require('date-fns/parse') // CommonJS
import parse from 'date-fns/parse' // ES 2015
import { parse } from 'date-fns' // ESM

parse('202309101010', 'YYYYMMDDhhmmss')

Answer 4

To handle date and time, you can utilize moment.js to parse the string in this manner:

moment('202309101010', 'YYYYMMDDhhmmss').format()

Alternatively,

You can explore date-fns library at this link

var parse = require('date-fns/parse') // CommonJS
import parse from 'date-fns/parse' // ES 2015
import { parse } from 'date-fns' // ESM

parse('202309101010', 'YYYYMMDDhhmmss')

Transforming a string such as "202309101010" into a date entity

Answer №1

Answer №2

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