How to determine if data.parse success

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Hi I have a javascript in which I will parse the value into datetime format. My codes as below:

var dateEnd = new Date(Date.parse(dateTimeValue));

I want to check if it is invalid date thus I have added the codes as below:

if (Object.prototype.toString.call(dateEnd) !== "[object Date]")
{
alert("Wrong date format");
}

But no matter i enter the correct or wrong format, the alert will prompt. What have I done wrong?

What I have tried:

1. Tried dateTimeValue instanceOf Date but no avail. Get the same result.

Posted 25-Dec-17 23:38pm

Jamie888

Updated 25-Dec-17 23:51pm

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Thomas Daniels · Accepted Answer · 2017-12-25T23:51:00

Solution 1

You can check if dateEnd.getTime() is NaN (Not a Number). In that case, the date is invalid.

JavaScript

if (isNaN(dateEnd.getTime())) {
    alert("Wrong date format");
}

Posted 25-Dec-17 23:51pm

Thomas Daniels

Comments

Afzaal Ahmad Zeeshan 26-Dec-17 7:05am

5ed.

Jamie888 26-Dec-17 21:21pm

Thank you sir, it works! I have tried this method too previously but it prompted me "gettime() is not a function" error. Maybe i missed out a bracket. Anyhow, may i know the details on why does my original method don't work? I have tried online for some explanation but could not quite get the answer i was looking for.

Thomas Daniels 27-Dec-17 6:04am

It's getTime, not gettime. JavaScript is case-sensitive.

Jamie888 28-Dec-17 1:13am

My bad. Thank you sir for your explanation and for the help. Really appreciate it.