Date constructor: numeric arguments vs. string argument giving different dates in some cases

Question

First of all, I think timezone probably has something to do with this. I\'m in EST/EDT. Also, I\'m testing this on chromium 17 / linux.

Now, let\'s say I create two

Answer 1

Using "-" as a date separator for USA dates confuses some browsers, some will perform date arithmetic others will return NaN, so use the "/" date separator. A culture aware solution is to use date.js, which is an outstanding JavaScript date handler that resolves issues like the one you have pointed out (http://www.datejs.com/). Using the parse method removes all confusion:

Date.parse("2020-12-15").toString() // yields the correct date ("Tue Dec 15 00:00:00 PST 2020").