CustomParseFormat doesn't parse double digit days and months properly in strict mode

[jojkos]

Describe the bug
When in strict mode, format "D.M.YYYY" should parse both "1.1.2020" and "01.01.2020", but it fails with Invalid date for the second.
https://runkit.com/embed/w5jkq082wagg

moment.js works this way moment/moment#2554
there even seems to be code for this https://github.com/iamkun/dayjs/blob/dev/src/plugin/customParseFormat/index.js (regexes match1to2) but probably doesn't work.

Expected behavior
dayjs("01.02.2020", "D.M.YYYY", true) should be parsed correctly

Information

• Day.js Version 1.8.26
• OS: Windows 10
• Browser Chrome 81.0.4044.129

[iamkun]

The question comes to is "01.02.2020" an invalid date string to "D.M.YYYY" format?

Since D stands for Day of the month with no leading zero, I tend to agree that 02 is invalid to D in strict mode but valid in loose mode.

[jojkos]

Thanks for the fast reacton.

I would tend to agree as well, if this wasn't supported in moment.js. And since there isn't support for multiple formats #817 the only solution i could come up with is try to parse date with each of the possible formats and find the first that is valid.

[iamkun]

We can have this, a nice enhancement, right?

[iamkun]

#906

dayjs('01.02.2020', ['D.M.YYYY', 'DD.MM.YYYY'], true)

[jojkos]

Thanks, this will help.

[geri777]

Could this be added for "YY" as well?

[iamkun]

Could this be added for "YY" as well?

you can pass your formats to the second parameter as an array.

[geri777]

Could this be added for "YY" as well?

you can pass your formats to the second parameter as an array.

Thank you @iamkun. I know, but the question was if YY could also accept values having YYYY - same as for D and DD.

[iamkun]

@geri777 what I mean is dayjs('2020', ['YYYY', 'YY'], true)

[ArvindhMangoleap]

@iamkun Hi passing formats in array does not seem to work.

Note: month and date values

But passing single format as string is working

Am I missing anything?
https://replit.com/@ArvindhAshok/date-Format

[BePo65]

Tried it today with dayjs v1.11.2: in both examples I get Day=5 and Month=1.

Which version did you use?