Review:

Day.js (lightweight Alternative To Moment.js)

overall review score: 4.5
score is between 0 and 5
day.js is a lightweight JavaScript library designed for parsing, validating, manipulating, and formatting dates. It serves as a modern alternative to Moment.js, focusing on simplicity, performance, and size reduction while maintaining a familiar API.

Key Features

  • Minimal footprint with around 2 kB size
  • Immutable date objects
  • Chainable API for easy date manipulation
  • Extensible with plugins
  • Supports internationalization and time zone handling
  • No dependency on external libraries
  • ES6 module support

Pros

  • Significantly smaller and faster than Moment.js, improving load times and performance
  • Simple and intuitive API that is easy to learn for developers familiar with Moment.js
  • Supports a wide range of date manipulation functionalities
  • Modular design allows users to include only needed features
  • Actively maintained with good community support

Cons

  • Less comprehensive in features compared to some larger libraries (e.g., full timezone support may require plugins)
  • Some functionality available in Moment.js might need additional configuration or plugins in day.js
  • Migration from Moment.js may require code updates due to API differences

External Links

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Last updated: Thu, May 7, 2026, 06:14:01 PM UTC