防止Javascript创建日期过长的日期

Question

In Javascript if I create a date like so:

var y=new Date('2014','16','06')

Then y will be on my computer Wed May 06 2015 00:00:00 GMT-0400 . However, the month I entered is 16 not 5 . Is there anyway to prevent Javascript from creating a valid date in this instance (when Month is too big) and just return 'Invalid Date'?

Answer 1

Here's the relevant information from the Mozilla Javascript documentation for Date :

Note: Where Date is called as a constructor with more than one argument, if values are greater than their logical range (eg 13 is provided as the month value or 70 for the minute value), the adjacent value will be adjusted. Eg new Date(2013,13,1) is equivalent to new Date(2014,1,1), both create a date for 2014-02-01 (note that the month is 0-based). Similarly for other values: new Date(2013,2,1,0,70) is equivalent to new Date(2013,2,1,1,10) which both create a date for 2013-03-01T01:10:00.

So in answer, no, that's the only behavior of the Date constructor, and any validation you want to do on your input values is going to have to be done by you before you pass them into the constructor.

However, one possible option could be to concatenate a string of your date value and then use Date.parse() on it, which will return a valid value if your date is correct or NaN if it isn't.