How to validate single date in javascript?

Question

My requirement is below. Can someone suggest how to validate the given dates below ?

Valid dates : 1/1/2017 01/1/2017 1/01/2017 01/01/2017

Invalid dates : 13/12/2017 13/13/2017 12/35/2017 13/13/2017

why do you need a regular expression to validate it. when you have date functions to validate it. — Panna Das, Dec 04 '17 at 05:56

Daniel Tran · Accepted Answer · 2017-12-04T06:29:47.400

1

function validateDate(dateStr) {
   const regExp = /^(\d\d?)\/(\d\d?)\/(\d{4})$/;
   let matches = dateStr.match(regExp);
   let isValid = matches;
   let maxDate = [0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
   
   if (matches) {
     const month = parseInt(matches[1]);
     const date = parseInt(matches[2]);
     const year = parseInt(matches[3]);
     
     isValid = month <= 12 && month > 0;
     isValid &= date <= maxDate[month] && date > 0;
     
     const leapYear = (year % 400 == 0)
        || (year % 4 == 0 && year % 100 != 0);
     isValid &= month != 2 || leapYear || date <= 28; 
   }
   
   return isValid
}

console.log(['1/1/2017', '01/1/2017', '1/01/2017', '01/01/2017', '13/12/2017', '13/13/2017', '12/35/2017'].map(validateDate));

My previous answer is not working on Edge.

edited Dec 04 '17 at 06:29

answered Dec 04 '17 at 05:57

Daniel Tran

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It won't work for `13/12/2017` – Nir Alfasi Dec 04 '17 at 05:58
I have updated include my tests. – Daniel Tran Dec 04 '17 at 06:02
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13/13/2017 is valid to JS, as days and months wrap. I don't think this is what the poster wants. – jhpratt Dec 04 '17 at 06:03
@jhpratt yes, that's what I pointed out in the first comment – Nir Alfasi Dec 04 '17 at 06:24
@alfasin my test failed on Edge, so I updated the answer. – Daniel Tran Dec 04 '17 at 06:30
it works fine. @ jhpratt For 13/13/2017 its returning false. Thanks @Daniel Tran. – Soumya Behera Dec 04 '17 at 06:52

How to validate single date in javascript?

1 Answers1