The best JavaScript date libraries in 3 different criteria is summarized at the bottom [Conclusion section]

The most popular package

Moment.js πŸ‘

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12M weekly Downloads

The lightest package

dayJS πŸ‘

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471 KB

The most stable package


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9 years


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Moment.js is one the oldest and best known date β€” related libraries for both Node.js and vanilla Javascript (making it browser compatible)


A lightweight JavaScript date library for parsing, validating, manipulating, and formatting dates. Documentation Moment…

Moment.js | Docs

Moment was designed to work both in the browser and in Node.js. All code should work in both of these environments, and…

Weekly Downloads *NPM




Package Size (Unpacked Size)

40.9 MB

Initial Release Date

Version 1.1.0 release Date β€” β€” β€” 9 Years ago

Current Version β€” β€” β€” 2.26.0

UPs πŸ‘

  • available in many different environments and different package managers including npm , yarn , NuGet, spm, meteor
  • very stable and reliable; been used by many software engineers for more than 9 years
  • very good browser compatibility; available in Windows 7

DOWNs πŸ‘‡

  • It is slow

It took Moment.js almost 9 seconds to parse 100 000 ISO 8601 dates, while Day.js needs only 0.5 seconds

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  • It is heavy

Longer loading time means lower user experience and worse SEO

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Top 5 JavaScript Date Libraries for Developer
19.15 GEEK