How to ensure the date string is in ISO 8061 format in javascript

Question

I have to understand whether the given string is in YYYY-MM-DD format.

I was tetsting using the following code snippet:

const isValidDate = (new Date(timestamp)).getTime() > 0;

However, in this case, "2015-06-22T13:17:21+0000" will be also valid.

I want to ensure only the day part is present in YYYY-MM-DD .

What would be a neat concise way to determine this in javascript.

Answer 1

Well you could do a regex test on the input string:

 var input = "2015-06-22"; if (/^\d{4}-\d{2}-\d{2}$/.test(input)) { console.log("MATCH"); }

If your requirement really be that the timestamp be precisely at midnight, you could also check the hours, minutes, and seconds components:

 var date = new Date(); date.setHours(0, 0, 0, 0); if (date.getHours() == 0 && date.getMinutes() == 0 && date.getSeconds() == 0) { console.log("Date is at midnight"); }