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Format

A collection of functions to format data.

date

A chainable interface to manipulate the options passed to Intl.DateTimeFormat.

This module offers three apis to manipulate the options passed to Intl.DateTimeFormat. Each api offers different affordances to manipulate the options.

  1. formatDate(date, options, locale): The most basic api. It takes a date and options and returns the formatted date string.
  2. createFormatDate(options, locale): A chainable api that allows you to manipulate the options. offers a lot of shorthand functions to manipulate the options.
  3. [option](date): A set of functions that call createFormatDate() without any option, turns on a single option, then call format() with the date passed to the function. Those function are also available for imports.

The module also exports single functions to quickly format a date:

short

Gets the short format of the date, in the default timezone and current locale.

short(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDate = short(new Date()); // "4/11/2024"

medium

Gets the medium format of the date, in the default timezone and current locale.

medium(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDate = medium(new Date()); // "Apr 11, 2024"

long

Gets the long format of the date, in the default timezone and current locale.

long(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDate = long(new Date()); // "April 11, 2024"

full

Gets the full format of the date, in the default timezone and current locale.

full(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDate = full(new Date()); // "Monday, April 11, 2024"

year

Gets the numeric year of the date, in the default timezone and current locale.

year(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedYear = year(new Date()); // "2024"

month

Gets the 2-digit month of the date, in the default timezone and current locale.

month(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedMonth = month(new Date()); // "04"

monthNumeric

Gets the numeric month of the date, in the default timezone and current locale.

monthNumeric(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedMonth = monthNumeric(new Date()); // "4"

monthName

Gets the long month of the date, in the default timezone and current locale.

monthName(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedMonthName = monthName(new Date()); // "April"

day

Gets the 2-digit day of the date, in the default timezone and current locale.

day(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDay = day(new Date()); // "11"

dayNumeric

Gets the numeric day of the date, in the default timezone and current locale.

dayNumeric(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDay = dayNumeric(new Date()); // "11"

weekday

Gets the long weekday of the date, in the default timezone and current locale.

weekday(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedWeekday = weekday(new Date()); // "Monday"

hour

Gets the 2-digit hour of the date, in the default timezone and current locale.

hour(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedHour = hour(new Date()); // "06"

hourNumeric

Gets the numeric hour of the date, in the default timezone and current locale.

hourNumeric(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedHour = hourNumeric(new Date()); // "6"

minute

Gets the 2-digit minutes of the date, in the default timezone and current locale.

minute(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedMinute = minute(new Date()); // "09"

minuteNumeric

Gets the numeric minutes of the date, in the default timezone and current locale.

minuteNumeric(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedMinute = minuteNumeric(new Date()); // "9"

second

Gets the 2-digit seconds of the date, in the default timezone and current locale.

second(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedSecond = second(new Date()); // "12"

secondNumeric

Gets the numeric seconds of the date, in the default timezone and current locale.

secondNumeric(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedSecond = secondNumeric(new Date()); // "12"

time

Gets the short time of the date, in the default timezone and current locale.

time(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedTime = time(new Date()); // "06:09 AM"

time24h

Gets the short time of the date in 24h format, in the default timezone.

time24h(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedTime = time24h(new Date()); // "06:09"

yyyymmdd

Formats the date into the ISO format, in the default timezone.

yyyymmdd(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDate = yyyymmdd(new Date()); // "2024-04-11"

yyyymmddLocal

Formats the date into the ISO format, in the USER'S timezone.

yyyymmddLocal(date: Date, options: FormatDateOptions = {}): string

Example Output:

const formattedDate = yyyymmddLocal(new Date()); // "2024-04-11"

price

This modules exports a formatPrice wrapper around Intl.NumberFormat that returns the formatted price string.

humanDuration

Formats a duration in minute into something more easier to read.

humanSize

Makes it easy to format and display sizes in bytes in a human friendly way. It provides a chain-able api for the limit and precision options.

relativeTime

This module provides functions to format a date relative to now. It uses the Intl.RelativeTimeFormat API, which is not supported by all browsers. It will default to toLocaleString() if the API is not supported or an error occurs.

The major feature in this module is the ability to detect the proper unit to use based on the difference between the date and now. For example, if the difference is 1 day, it will use the day unit, but if the difference is 1 hour, it will use the hour unit. This is done by providing a list of units to use, and the maximum difference for each unit. The units are also skewed to make the difference more human readable. For example, the day unit will be used even if the difference is less than 1 day, but close to it.

It supports 3 api:

  1. formatRelativeTime(date, options, unit, locale, now): formats the date relative to now, using the given options, unit and locale. You can also set the now date, which defaults to new Date().
  2. relativeTime(options, unit, locale, now): creates a formatter for the given options, unit, locale and now date. It returns a chainable object that allows you to set the unit, locale and now date, and then format a date.
  3. timeAgo(date): formats the date relative to now, using the default options, unit and locale. This is probably the most common use case, so it's provided as a convenience.

translations

The translations needed for humanDuration, humanSize and relativeTime.