"isValid" returns true on invalid date.

[Cerceis]

        const testDate = "2021-07-07"
        console.log(dayjs(testDate).isValid())
        //Output : true
        const testDate = "abc07-07"
        console.log(dayjs(testDate).isValid())
        //Output : false
        const testDate = "abc-07-07"
        console.log(dayjs(testDate).isValid())
        //Output : true <-- Problem

Or does it intended to only check for the date format ?

[iamkun]

isValid only checks if it's a valid date to Date object.

You may specify a boolean for the last argument to use strict parsing. Strict parsing requires that the format and input match exactly, including delimiters. https://day.js.org/docs/en/parse/string-format