Date Formatter Module

This module provides functionality to format JavaScript Date objects into strings and parse date strings back into Date objects. The format can be customized with tokens, and the module supports multiple locales for day and month names.

Features

• Date Formatting: Convert a Date object to a string using customizable format tokens.
• Date Parsing: Convert a formatted date string into a Date object.
• Localization: Support for localized day and month names using the Intl.DateTimeFormat API.
• Customizable Format Tokens: Use a variety of tokens to define date format, including time, day, month, year, AM/PM, and timezone.

Installation

Install the module via npm:

npm install pure-date-format

Usage

1. Formatting a Date

Use the from method to format a JavaScript Date object into a string.

import formatter from 'pure-date-format';

const date = new Date();
const format = 'YYYY-MM-DD HH:mm:ss A';
const formattedDate = formatter.from(date, format, 'en-US');

console.log(formattedDate); // Example: "2024-09-07 02:35:45 PM"

2. Parsing a Date String

Use the to method to parse a formatted date string into a Date object.

import formatter from 'pure-date-format';

const dateString = '2024-09-07 02:35:45 PM';
const format = 'YYYY-MM-DD HH:mm:ss A';
const parsedDate = formatter.to(dateString, format, 'en-US');

console.log(parsedDate); // Output: Date object for "2024-09-07 02:35:45 PM"

3. Validation a Date String

• Check if the date string can be parsed as a valid Date object.
• Supports custom date formats when provided.
• Handles invalid date strings gracefully by returning false.

import formatter from 'pure-date-format';

const dateString = '2024-09-07 02:35:45 PM';
const format = 'YYYY-MM-DD HH:mm:ss A';
const isValid = formatter.isValid(dateString, format);

console.log(isValid); // Output: true

4. Supported Format Tokens

Token	Description	Example
YYYY	Full year	2024
YY	Two-digit year	24
MMMM	Full month name	September
MMM	Abbreviated month name	Sep
MM	Two-digit month number	09
M	Month number	9
DD	Two-digit day of the month	07
D	Day of the month	7
HH	Two-digit hour (24-hour)	14
H	Hour (24-hour)	14
hh	Two-digit hour (12-hour)	02
h	Hour (12-hour)	2
mm	Two-digit minute	35
m	Minute	35
ss	Two-digit second	45
s	Second	45
SSS	Milliseconds	123
A	AM/PM	PM
a	am/pm	pm
Z	Timezone offset (+HH:mm)	+02:00
ZZ	Timezone offset (+HHmm)	+0200

5. Localization

Localized day and month names are supported through the Intl.DateTimeFormat API. Pass a valid locale code (e.g., 'en-US', 'fr-FR', etc.) as the third argument to either from or to.

const formattedDate = formatter.from(new Date(), 'dddd, MMMM D, YYYY', 'fr-FR');
console.log(formattedDate); // Example: "samedi, septembre 7, 2024"

6. Manipulate a Date

• Add or subtract time units to/from a Date object.
• Supports the following time units: ms, milliseconds, s, seconds, m, minutes, h, hours, d, days, M, months, y, years.

const newDate = formatter.add(new Date(), 3, 'days');

API

from(date: Date, format: string, locale?: string)

Formats a Date object into a string using a specified format.

• date: The Date object to format.
• format: A string defining the format using the supported tokens.
• locale: An optional locale string (default: 'en-US').

Returns the formatted date string.

to(dateString: string, format: string, locale?: string)

Parses a formatted date string into a Date object.

• dateString: The formatted date string to parse.
• format: The format string that matches the date string.
• locale: An optional locale string (default: 'en-US').

Returns a JavaScript Date object representing the parsed date.

isValid(dateString: string, format?: string)

The isValid function validates a date string by checking if it can be parsed into a valid date object. Optionally, it allows specifying a format for the date string to ensure the input adheres to a specific date format.

• dateString: The formatted date string to validate.
• format(optional, string): A specific date format to validate against (e.g., 'YYYY-MM-DD'). If no format is provided, the function defaults to creating a Date object from the string.

Returns true if the dateString is a valid date or false if if the dateString is invalid.

add(date: Date, amount: number, unit: TimeUnit)

Return new date has manipulate.

• date: The date object to manipulate.
• amount: The amount off unit need add/subtract.
• unit: The unit of amount.

License

This project is licensed under the MIT License.

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