I was trying to validate birthday using dayjs
but its isValid
is returning true
for a date that doesn’t exist. Funnily enough, the isValid
by moment
is working just fine.
dayjs('2019/02/31', 'YYYY/MM/DD').isValid() // true moment('2019/02/31', 'YYYY/MM/DD').isValid() // false
I can’t switch to moment
because of the lightweightness of dayjs
Any idea how to tackle this?
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Answer
Please look at this thread. Basically isValid
doesn’t validate if passed date is exists, it just validates that date was parsed correctly.
I’m not exactly sure if this works in all scenarios (especially if you have localization), but you could try something like:
function validate(date, format) { return dayjs(date, format).format(format) === date; } validate('2019/02/31', 'YYYY/MM/DD') // false
Reason for this kind of check is that
dayjs('2019/02/31', 'YYYY/MM/DD').format('YYYY/MM/DD')
returns 2019/03/03
. Then when you compare it to your initial date (you should be able because formatting is the same) you should get the same value – and in this case you don’t.