new Date(milliseconds) returns Invalid date

问题

I am trying to convert milliseconds to a date using the javascript using:

new Date(Milliseconds);

constructor, but when I give it a milliseconds value of say 1372439683000 it returns invalid date. If I go to a site that converts milliseconds to date it returns the correct date.

Any ideas why?

回答1:

You're not using a number, you're using a string that looks like a number. According to MDN, when you pass a string into Date, it expects

a format recognized by the parse method (IETF-compliant RFC 2822 timestamps).

An example of such a string is "December 17, 1995 03:24:00", but you're passing in a string that looks like "1372439683000", which is not able to be parsed.

Convert Milliseconds to a number using parseInt, or a unary +:

new Date(+Milliseconds); 
new Date(parseInt(Milliseconds,10));

回答2:

The Date function is case-sensitive:

new Date(Milliseconds);

回答3:

instead of this

new date(Milliseconds);

use this

new Date(Milliseconds);

your statement will give you date is not defined error

回答4:

I was getting this error due to a different reason.

I read a key from redis whose value is a json.

client.get(someid, function(error, somevalue){});

Now i was trying to access the fields inside somevalue (which is a string), like somevalue.start_time, without parsing to JSON object. This was returning "undefined" which if passed to Date constructor, new Date(somevalue.start_time) returns "Invalid date".

So first using JSON.parse(somevalue) to get JSON object before accessing fields inside the json solved the problem.

来源：https://stackoverflow.com/questions/17371302/new-datemilliseconds-returns-invalid-date

标签

javascript

date

time

milliseconds