javascript - Check if date is a valid one

Question

Following is the scenario:

I have a String date and a date format which is different. Ex.:
date: 2016-10-19
dateFormat: "DD-MM-YYYY".

I need to check if this date is a valid date.

I have tried following things

var d = moment("2016-10-19",dateFormat);

d.isValid() is returning false every time. Does not Moment.js parse the date in the given format?

Then I tried to format the date in DD-MM-YYYY first and then pass it to Moment.js:

var d = moment("2016-10-19").format(dateFormat);
var date = moment(d, dateFormat);

Now date.isValid() is giving me the desired result, but here the Moment.js date object is created twice. How can I avoid this? Is there a better solution?

FYI I am not allowed to change the dateFormat.

Answer 1

Was able to find the solution. Since the date I am getting is in ISO format, only providing date to moment will validate it, no need to pass the dateFormat.

var date = moment("2016-10-19");

And then date.isValid() gives desired result.