not add zero when format YYYY if year less than 1000 > d.format('YYYY-MM-DD') = 1-01-01
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Description
**Describe the bug**
not add zero when format YYYY if year less than 1000 > d.format('YYYY-MM-DD') = 1-01-01
**Expected behavior**
d.format('YYYY-MM-DD') = 0001-01-01
**Information**
- Day.js Version : 1.11.6
- OS: MacOs 13.4
- Browser : chrome 114.0.5735.198
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