![]() Toloco Math.ceiling((d2 - d1) / N) 31 1 2 IncorrectĪlthough Math.round returns the correct results, I think it's somewhat clunky. Some Math.floor((d2 - d1) / N) 31 0 1 Incorrectįuentesjr Math.round((d2 - d1) / N) 31 1 1 Correct Here are the results on a system located in California:. Numbers and Dates - MDN JavaScript GuideĪlso, for illustration purposes, the snippet uses named access on the window object for brevity, but in production you should use standardized APIs like getElementById, or more likely, some UI framework.Īs of this writing, only one of the other answers correctly handles DST (daylight saving time) transitions.You should carefully read the documentation for the Date object and its methods, and for anything more complicated, strongly consider using a library that offers more safe and powerful APIs for date manipulation. You should be aware that the "normal" Date APIs (without "UTC" in the name) operate in the local timezone of the user's browser, so in general you could run into issues if your user is in a timezone that you don't expect, and your code will have to deal with Daylight Saving Time transitions. Return new Date(mdy, mdy - 1, mdy) Īlert(datediff(parseDate(first.value), parseDate(second.value))) date format (which does no error checking) * new Date("dateString") is browser-dependent and discouraged, so we'll write * Round to nearest whole number to deal with DST. * Take the difference between the dates and divide by milliseconds per day.
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