Number of months in a year.

> This utility library provides multiple functionalities like covert number of months into years, convert years into number of months, number of days in a month of year, year is leap year or not, get number of weekends, get remaining days in month or year

React component that renders an interactive bar chart comparing two currencies over a variable number of months.

A calculator for humanity’s peculiar conventions of time.

node

Internationalized calendar, date, and time manipulation utilities

A library for obtaining browser versions with their maximum supported Baseline feature set and Widely Available status.

Determines current age based on a date of birth string YYYY-MM-DD using same weird logic we humans do.

A JavaScript library for internationalization and localization that leverages the official Unicode CLDR JSON data.

node

Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

A JavaScript library for financial calculations

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

F-Interest is an app that tells you what you will save between 30 and 15 year loans. Or you can enter a custom monthly rate and number of months.

Cache-control header utility that parses human readable time strings into seconds.

A complex numbers library

Telephone number input React component

A library for arbitrary-precision decimal and non-decimal arithmetic

node

A simpler (and smaller) rewrite of Google Android's libphonenumber library in javascript