Release 0.6.4

• Updated data to IANA TZDB 2026d. #1157
• Fixed calendar arithmetic around time zone gaps. #1151
• Fixed default date selection when creating a zoned Moment with only time fields.
  • Object inputs (e.g. moment.tz({ hour: 9 }, zoneName)). #1156
  • String inputs (e.g. moment.tz('09:00', 'HH:mm', zoneName)). #1159
  • Using un-zoned moment() when there is also a zone set with moment.tz.setDefault(zoneName). #1161
    • NOTE: This specific fix only works when also using core moment version 2.31.0 or higher.
      All other fixes in this release work with all supported versions of moment.

Release 0.6.3

• Updated data to IANA TZDB 2026c. #1148

Release 0.6.2

• Updated data to IANA TZDB 2026b. #1145

Release 0.6.1

• Updated data to IANA TZDB 2026a. #1140

NOTE: This release does not include recently-announced DST changes for British Columbia, Canada. Those changes will likely be in 2026b.

Release 0.6.0

• Fixed and updated TypeScript definitions. #1132
  • Updated types to more accurately match the code implementation.
  • Added definitions for pre-built files (e.g. moment-timezone-with-data.js).

This release is a potential breaking change for TypeScript projects only.
The types are now more accurate, but consumers might hit errors if they were relying on the more relaxed types.

No implementation code has changed in this release.

Release 0.5.48

• Updated data to IANA TZDB 2025b. #1130

Release 0.5.47

• Updated data to IANA TZDB 2025a. #1125

Release 0.5.46

• Updated data to IANA TZDB 2024b. #1121
  This only affects historical timestamps; no future timestamps have changed.

Release 0.5.45

• Updated data to IANA TZDB 2024a. #1095

Release 0.5.44

• Updated data to IANA TZDB 2023d. #1085
• Fixed .valueOf() to return NaN for invalid zoned objects (matching default moment) #1082.
• Performance improvements:
  • Use binary search when looking up zone information #720.
  • Avoid redundant checks in tz.guess().
  • Avoid redundant getZone() calls in .tz().