JavaScript Date parse() method parses a date string and returns the number of milliseconds since January 1, 1970, 00:00:00 UTC. But if the given string date is unrecognized or, in some cases, contains illegal date values then it will return NaN (Not-a-Number).
Syntax
Date.parse(dateString)
Parameter Values
A string representing a date.
Example of JavaScript date parse
Let’s see simple example, where will try to get the the number of milliseconds between January 1, 1970 and July 21, 2020:
<!DOCTYPE html>
<html>
<body>
<script>
var d = Date.parse("July 21, 2020");
alert(d);
</script>
</body>
</html> Output:
How to Javascript convert date format
You should look into momentjs, which is a javascript date/time library. By using this Library, you can easily convert between dates of different formats. In your case, it would be:
string newDate = moment(currentDate, currentFormatString).format(newFormatString)
For example, moment("21/10/14", "DD/MM/YY").format("MM/DD/YY") would return "10/21/14"
Q: What is the common Error javascript date parse method?
Answer: If the input string of date is not correct, it returns NaN (not a number). See below example of it:-
<script>
var d = "July 31, 2020 12:30 PM";
var md = Date.parse(d);
document.write(md);
</script> Output: NaN
Do comment if you have any doubts and suggestions on this topic.
Note: The All JS Examples codes are tested on the Safari browser (Version 12.0.2) and Chrome.
OS: macOS 10.14 Mojave
Code: HTML 5 Version