inconsistencies where 0 is involved when initialising from a string

[dagda1]

Describe the bug
Inconsistencies where 0 is involved

For example:

const m1 = dayjs('1970-07-05', 'YYYY-MM-DD').format('DD-MM-YYYY') // '05-07-1970'

assert(dayjs('1970-00-00', 'YYYY-MM-DD').isValid(), "should this be valid?")

const  m2 = dayjs('1970-00-00', 'YYYY-MM-DD').format('DD-MM-YYYY') // '30-11-1969'

const m3 = dayjs('0000-01-01', 'YYYY-MM-DD').format('DD-MM-YYYY') // '01-01-1900'

Expected behavior
I was surprised that this code was true

assert(dayjs('1970-00-00', 'YYYY-MM-DD').isValid(), "should this be valid?")

Is this a bug or expected behaviour?

Information
version - 1.8.23
os - osx

[iamkun]

This is valid to new Date()

We might need a strict mod to better handle this problem?

[dagda1]

@iamkun just what I was going to suggest. At least I know now though. Thanks

[dagda1]

@iamkun is #882 something I can now use?

[iamkun]

Will release soon @dagda1

[iamkun]

🎉 This issue has been resolved in version 1.8.26 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀