Incorrect date parsing when format is 'MMM-YY'

[mpycio]

Describe the bug
'Apr-22' is getting parsed as 22/04/2001, despite providing parse format as 'MMM-YY', https://jsfiddle.net/Lhv5fpyw/4/

Expected behavior
Date should be parsed correctly as 01/04/2022.

Information

• Day.js Version 1.11.2
• OS: OSX
• Browser : Chrome 101
• Time zone: BST

[astoilkov]

I have the same issue. Posting my dummy workaround here:

function fixDayjs(input: string): Dayjs | undefined {
  const date = dayjs(input)
  
  if (date.isValid()) {
    // https://github.com/iamkun/dayjs/issues/1902
    // https://github.com/iamkun/dayjs/issues/1251
    if (date.year() === 2001 && !input.split(' ').includes('2001')) {
      return date.set('year', dayjs().year())
    }

    return date
  }

  return undefined
}

[joeyipjoeyip]

I have another incorrect parsing bug

Describe the bug
Converting "173000123" with format "HHmmssSSS" to get Unix timestamp in milliseconds returns a negative value, which when parsed back, returns "Mon Dec 12 1729 03:00:00 GMT+0736", https://jsfiddle.net/joeyip/8t2jd1bm/

Expected behavior
The time part should be 17:30:00

Information

• Day.js Version 1.11.2
• OS: Windows 10
• Browser : Firefox 91.9.1esr
• Time zone: GMT+8

[BePo65]

Would be fixed with pr #1914