new Date(milliseconds) returns Invalid date
JavascriptDateTimeMillisecondsJavascript Problem Overview
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?
Javascript Solutions
Solution 1 - Javascript
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));
Solution 2 - Javascript
The Date function is case-sensitive:
new Date(Milliseconds);
Solution 3 - Javascript
instead of this
new date(Milliseconds);
use this
new Date(Milliseconds);
your statement will give you date is not defined error
Solution 4 - Javascript
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.
Solution 5 - Javascript
Is important to note that the timestamp parameter MUST be a number, it cannot be a string.
new Date(1631793000000).toLocaleString('en-GB', { timeZone: 'America/Argentina/Buenos_Aires' });
// Returns: '16/09/2021, 08:50:00'
new Date("1631793000000").toLocaleString('en-GB', { timeZone: 'America/Argentina/Buenos_Aires' });
// Returns: 'Invalid Date'
In case you're receiving the timestamp as string, you can simply wrap it around parseInt(): parseInt(your_ts_string)