date UTC format is wrong
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Description
**Describe the bug**
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`dayjs('2025-01-31', 'UTC').startOf('month').add(3, 'month').format('YYYY-MM-DD')`
// 2024-04-30
why the result is 2024-04-30? it should be 2025-04-01?
**Expected behavior**
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**Information**
- Day.js 1.11.12
- OS: MacOS
- Browser Chrome 137.0.7151.41 (Official Build) (arm64)
- Time zone: Asia/Shangehai
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