Easy Timer/Countdown/Chronometer Library – easytimer.js
easytimer.js is an easy-to-use JavaScript library that allows to count up to or countdown from a given value with callback support.
Date & Time
Time Zones And UTC Converter In JavaScript – xtz.js
A lightweight, blazing-fast JavaScript library for converting between time zones as well as translating between Relative TimeZone and Absolute UTC.
Handling Timezone In JavaScript – Spacetime
Spacetime is a pure JavaScript library used to manipulate, traverse, compare, and format dates and times across planet Earth.
Feature-rich Datetime Picker Component With JavaScript
A responsive, multilingual, feature-rich, and easy-to-customize date, time, and date range picker component written in JavaScript.
Beautiful Date Picker Component – MCDatepicker
A well-designed, fully responsive, highly-customizable, framework-agnostic date & date range picker component written in Vanilla JavaScript.
Glassmorphic Style Calendar Component With JavaScript
A Glassmorphism design inspired Calendar component based on yusufshakeel’s dyCalendarJS library.
Android Style Date Picker With Plain JavaScript – m-datepicker.js
A minimal date picker JavaScript library inspired by the Android Material Design datepicker component.
Lightweight Date & Time Manipulation Library – dayjs
dayjs is a blazing-fast, ultra light (2kb) alternative to the moment.js library that helps you parse, validate, manipulate, and display dates and times in pure JavaScript.
Material Inspired Date & Time Picker – simplePicker
simplePicker is a vanilla JavaScript plugin to create Material Design inspired date picker with time picker integrated.
Feature-rich Event Calendar In JavaScript – Calendar.js
A full-featured event calendar JavaScript library that allows you to view and manage events (like scheduled tasks, appointments) in a responsive calendar interface.