Timezone Utility

A versatile timezone management package designed for CommonJS, ES Module (ESM), JavaScript, and TypeScript projects. It offers a range of features, including timezone listing, retrieving labels and values, region-based filtering, and converting between UTC and other timezones.

Table of Contents

• Installation
• Usage
• Methods Overview
• Methods
  • list
  • listWithoutLabel
  • listWithoutValue
  • listByRegion
  • getLabelFromValue
  • getValueFromLabel
  • getRegions
  • convertUTCToTimeZone
  • convertToUTC
  • convertBetweenTimeZones
  • getCurrentTimeInTimeZone
  • getTimeDifferenceBetweenTimeZones
  • convertToISO
• License
• Contributing

Installation

Install the package using npm:

npm install timezone-utility

Usage

// For ES Module (ESM)
import { TimeZone } from "timezone-utility";

// For CommonJS
const { TimeZone } = require("timezone-utility");

Methods Overview

Method Name	Description
list	Returns a list of all available time zones.
listWithoutLabel	Returns a list of all time zone values without labels.
listWithoutValue	Returns a list of all time zone labels without values.
listByRegion	Lists time zones for a specific region.
getLabelFromValue	Gets the label for a given time zone value.
getValueFromLabel	Gets the value for a given time zone label.
getRegions	Returns a list of all available regions.
convertUTCToTimeZone	Converts a UTC date to a specified time zone.
convertToUTC	Converts a date-time from a specified time zone to UTC.
convertBetweenTimeZones	Converts a date-time between two specified time zones.
getCurrentTimeInTimeZone	Gets the current time in a specified time zone.
getTimeDifferenceBetweenTimeZones	Calculates the time difference between two time zones.
convertToISO	Converts a formatted date-time string to ISO format.

Methods

list

Returns a list of all available time zones.

const timeZones = TimeZone.list();
console.log(timeZones);

Output Example:

[
  { "label": "(UTC+00:00) Africa/Abidjan", "value": "Africa/Abidjan" },
  { "label": "(UTC-05:00) America/New_York", "value": "America/New_York" },
  ...
]

listWithoutLabel

Returns a list of all time zone values without labels.

const timeZoneValues = TimeZone.listWithoutLabel();
console.log(timeZoneValues);

Output Example:

[
  "Africa/Abidjan",
  "America/New_York",
  ...
]

listWithoutValue

Returns a list of all time zone labels without values.

const timeZoneLabels = TimeZone.listWithoutValue();
console.log(timeZoneLabels);

Output Example:

[
  "(UTC+00:00) Africa/Abidjan",
  "(UTC-05:00) America/New_York",
  ...
]

listByRegion

Lists time zones for a specific region.

const timeZonesInRegion = TimeZone.listByRegion('America');
console.log(timeZonesInRegion);

Output Example:

[
  { "label": "(UTC-05:00) America/New_York", "value": "America/New_York" },
  { "label": "(UTC-06:00) America/Chicago", "value": "America/Chicago" },
  ...
]

Parameters:

• region: string: The region to filter time zones.

getLabelFromValue

Gets the label for a given time zone value.

const label = TimeZone.getLabelFromValue('America/New_York');
console.log(label);

Output Example:

"(UTC-05:00) America/New_York"

Parameters:

• value: TimeZoneNames: The time zone value.

getValueFromLabel

Gets the value for a given time zone label.

const value = TimeZone.getValueFromLabel('(UTC-05:00) America/New_York');
console.log(value);

Output Example:

"America/New_York"

Parameters:

• label: string: The time zone label.

getRegions

Returns a list of all available regions.

const regions = TimeZone.getRegions();
console.log(regions);

Output Example:

[
  "Africa",
  "America",
  "Asia",
  "Atlantic",
  "Australia",
  "Europe",
  "Indian",
  "Pacific"
]

convertUTCToTimeZone

Converts a UTC date to a specified time zone.

const converted = TimeZone.convertUTCToTimeZone('2023-10-10T10:00:00', 'America/New_York', { is24Hour: true });
console.log(converted);

Output Example:

"2023-10-10 06:00:00"

Parameters:

• utcDate: Date | string: The UTC date.
• targetTimeZone: TimeZoneNames: The target time zone.
• options: ConvertOptions (optional): Object containing optional formatting options:
  • is24Hour: boolean: Whether to use 24-hour format (default true).
  • dateSeparator: string: The date separator (default -).
  • timeSeparator: string: The time separator (default :).

convertToUTC

Converts a date-time from a specified time zone to UTC.

const converted = TimeZone.convertToUTC('2023-10-10T10:00:00', 'America/New_York', { is24Hour: false });
console.log(converted);

Output Example:

"2023-10-10T14:00:00.000Z"

Parameters:

• dateTime: Date | string: The date-time to convert.
• sourceTimeZone: TimeZoneNames: The source time zone.
• options: ConvertOptions (optional): Object containing optional formatting options:
  • is24Hour: boolean: Whether to use 24-hour format (default true).
  • dateSeparator: string: The date separator (default -).
  • timeSeparator: string: The time separator (default :).

convertBetweenTimeZones

Convert a datetime from one timezone to another and format it in either 12-hour or 24-hour format. You can also specify a custom date separator. By default, the function uses a 24-hour format (is24Hour = true) and the date separator is -.

const originalDate = "2024-10-15T14:00:00Z";
const convertedTime = TimeZone.convertBetweenTimeZones(originalDate, 'America/New_York', 'Asia/Dhaka', {is24Hour: false, dateSeparator: '-', timeSeparator: ':'});
console.log(convertedTime); 

Output Example:

"10/15/2024, 12:00:00"

Parameters:

• date: string: The date-time string to convert.
• fromTimeZone: TimeZoneNames: The source timezone.
• toTimeZone: TimeZoneNames: The target timezone.
• options: ConvertOptions (optional): Object containing optional formatting options:
  • is24Hour: boolean: Whether to use 24-hour format (default true).
  • dateSeparator: string: The date separator (default -).
  • timeSeparator: string: The time separator (default :).

getCurrentTimeInTimeZone

Returns the current date and time in the specified timezone. The method allows formatting options such as 24-hour or 12-hour format and custom date and time separators.

const currentTimeInNY = TimeZone.getCurrentTimeInTimeZone('America/New_York', { is24Hour: false, dateSeparator: '-', timeSeparator: ':' });
console.log(currentTimeInNY); 

Output Example:

"10-15-2024 08:34:56 AM"

Parameters:

• targetTimeZone: TimeZoneNames: The target timezone in which you want the current time.
• options: ConvertOptions (optional): Object containing optional formatting options:
  • is24Hour: boolean: Whether to use 24-hour format (default true).
  • dateSeparator: string: The date separator (default -).
  • timeSeparator: string: The time separator (default :).

getTimeDifferenceBetweenTimeZones

Calculates the time difference between two time zones for a specific date.

const difference = TimeZone.getTimeDifferenceBetweenTimeZones('2023-10-10T10:00:00', 'UTC', 'America/New_York');
console.log(difference);

Output Example:

"+4 hours 0 minutes"

Parameters:

• date: string: The date string to use for calculation.
• fromTimeZone: TimeZoneNames: The source time zone.
• toTimeZone: TimeZoneNames: The target time zone.

convertToISO

Converts a formatted date-time string to ISO format.

const isoString = TimeZone.convertToISO("10th October 2023, 10:00 AM");
console.log(isoString);

Output Example:

"2023-10-10T10:00:00"

Parameters:

• dateTimeString: string: The date-time string to convert.

License

This project is licensed under the MIT License.

Contributing

We welcome contributions to this package! If you find any issues or have suggestions for improvements, please open an issue or submit a pull request.