dayjs format behaves inconsistently in different versions of macOS
- Dominant language
- JavaScript
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Description
**Describe the bug**
MacOS 12.6
`dayjs("2025-01-15T16:00:00Z","YYYY-MM-DD HH:mm:ss").format("YYYY-MM-DD HH:mm:ss")==>>>> '2025-01-16 00:00:00'
`
MacOS 13.4.1
`dayjs("2025-01-15T16:00:00Z","YYYY-MM-DD HH:mm:ss").format("YYYY-MM-DD HH:mm:ss")==>>>> '2025-01-15 16:00:00'`

**Information**
- MacOS
- chrome 131.0.6778.266
- Time zone: Time zone: UTC+8
Contributor guide
Research direction
No source file, test, or entry point is named. Start by reproducing the exact dayjs expression on macOS 12.6 and 13.4.1 with Chrome 131 and UTC+8, then compare the resulting behavior; done means the version-dependent formatting discrepancy is explained and covered by a reproducible test or confirmed environmental limitation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript
- Domain
- web-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100