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Day.js vs spacetime
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Day.js | spacetime |
|---|---|---|
| Language | JavaScript | JavaScript |
| Licence | MIT | Other |
| Stars | 49k | 4.1k |
| Latest | v1.11.23 | 7.16.0 |
| Last push | 2026-09-15 | 2026-10-01 |
| Release cadence | about 78 days between releases | about 19 days between releases |
| Active contributors | 4 commit authors on the default branch in the last 90 days | 4 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace Moment.js. Alternatives to Moment.js →
Drop-inDay.jsMoment-compatible API in about 2 kB.
Full replacementspacetimeTimezone-aware dates with the timezone data built in, and an immutable API.
Day.js
- v1.11.232026-08-17plugin: timezone plugin prevent RangeError for invalid Day.js values (#3180) (dad46e6)
- v1.11.222026-08-16plugin: timezone compute instance .tz() offset without host DST (#3174) (e27ee80), closes #3169
- v1.11.212026-05-26preserve unsupported year tokens in format (#3015) (#3016) (8fda602)
- v1.11.202026-03-12Update locale km.js to support meridiem (#3017) (9d2b6a1)
- v1.11.192025-10-31added usage warnings for diff + updated unit tests (#2948) (269a7a9)
spacetime
- 7.16.02026-10-01[change] deprecated but exposed .d date now is in UTC - users can do s.toNativeDate()
- 7.15.02026-09-19[fix] - stale dst offsets #470 (thanks Sudarshan!)
- 7.14.02026-09-11[new] - support JavaScript's Date.toString() fmt as input #465
- 7.13.02026-06-23[fix] - typescript config issue
- 7.12.12026-05-27[fix] - regression for today param in object format
Day.js
unsigned The latest release, v1.11.23, carries no signature GitHub could verify.
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spacetime
✓ signed The latest release, 7.16.0, carries a signature GitHub verified.
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