# What changed in moment-timezone

> 9 changes in moment-timezone 0.6 from its official release notes, upgrade guides and advisories: 1 breaking. Each one cited. Sources checked 2026-10-18. HTML: https://unstale.sh/npm/moment-timezone/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## moment-timezone 0.6

### Breaking changes

- Fixed default date selection when using un-zoned moment() while a default zone is set; this fix requires core moment 2.31.0 or higher. (0.6.4) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.4)

### Behavior and default changes

- Updated timezone data to IANA TZDB 2026e, which may affect timezone behavior. (0.6.5) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.5)
- Time zone data was updated to IANA TZDB 2026d, which may change time zone offsets and transitions. (0.6.4) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.4)
- Updated timezone data to IANA TZDB 2026c, which may change timezone calculations. (0.6.3) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.3)
- Updated the timezone data to IANA TZDB 2026b, which may change timezone calculations. (0.6.2) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.2)

### Fixes and other changes

- Fixed calendar arithmetic around time zone gaps. (0.6.4) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.4)
- Fixed default date selection when creating a zoned Moment with only time fields in object inputs. (0.6.4) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.4)
- Fixed default date selection when creating a zoned Moment with only time fields in string inputs. (0.6.4) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.4)
- Updated timezone data to 2026a; recently announced DST changes for British Columbia, Canada are not included and will likely arrive in 2026b. (0.6.1) — [release notes](https://github.com/moment/moment-timezone/releases/tag/0.6.1)