dayjs('10-10').format('MM.DD') get 10.01 in iOS

**Describe the bug**
When using dayjs('10-10').format('MM.DD') on iOS (Safari), the result is 10.01 instead of the expected 10.10.

**Expected behavior**
The expected result should be 10.10 when formatting the date as MM.DD.

**Information**
 - Day.js Version [e.g. v1.0.0]
 - OS: [iOS]
 - Browser [safari]
 - Time zone: [e.g. GMT-07:00 DST (Pacific Daylight Time)]
