JS Date is not starting with leading 0 - Possible duplicate question

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I am trying to convert my array from this format

ka_layers2 = ["1-05-2019","2-05-2019" ........,"15-05-2019",.."27-05-2019"]

to something like this,

"01-05-2019","02-05-2019"

And here is my code to do so

for(i = 0; i < ka_layers2.length; i++){
  var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
  var d = new Date(ka_layers2[i]);
  var day = console.log("0"+d.getDate()).slice(-2);
  console.log(day);
  ka_layers2arr.push(day + '-' + months[d.getUTCMonth()] + '-' + d.getUTCFullYear());
}

But this giving me a problem with "Cannot read property 'slice' of undefined"

I'm trying with answer mentioned in this question. Javascript add leading zeroes to date

Using regex

/\b(\d)\b/g demo

let dates = ["1-05-2019", "2-05-2019", "15-05-2019", "27-05-2019"]

let result = dates.map(date => date.replace(/\b(\d)\b/g, '0$1'))

console.log(result)

Javascript add leading zeroes to date, So no matter what, we can add "0" to the day or month, and just ask for the last padStart(targetLength[, padString]) adds as many as possible padString in the There is another approach to solve this problem, using slice in JavaScript. for working with numbers only and not more than 2 digits, this is also an approach: possible duplicate of Replace leading 0 on input field – Ωmega Nov 12 '13 at 20:03 Replacing the first digit would be replace(/^[0-9]/,''); . Note the carrot position outside the brackets. – woemler Nov 12 '13 at 20:04

You could split the string, pad the parts with the wanted zeros and join the parts back to a single string.

var array = ["1-05-2019", "2-05-2019", "15-5-200", "27-05-2019"],
    result = array.map(s => s.split('-').map((v, i) => v.padStart([2, 2, 4][i], '0')).join('-'));
    
console.log(result);

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ka_layers2 = ["1-05-2019","2-05-2019", "15-05-2019", "27-05-2019"];

for(i = 0; i < ka_layers2.length; i++){
  if (ka_layers2[i].indexOf("-") === 1) {
    ka_layers2[i] = "0" + ka_layers2[i];
  }
}

console.log(ka_layers2);

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You can split on - and check if the length of first part is less than 2 than add a leading zero else keep it as it is, and than join with -

let arr = ["1-05-2019", "2-05-2019", "15-05-2019", "27-05-2019"]

let getYearsWithZero = (str) => {
  let [date, ...rest] = str.split('-')
  date = date.length < 2 ? '0' + date : date
  return [date, ...rest].join('-')
}

arr.forEach(v => console.log(getYearsWithZero(v)))

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Thanks to all the answers. I also tried something like this and it worked.

for(i = 0; i < ka_layers2.length; i++){
        var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
        var d = new Date(ka_layers2[i]);
        var day = "0"+d.getDate()
        var new_day =  day.slice(-2);
        ka_layers2arr.push(new_day + '-' + months[d.getUTCMonth()] + '-' + d.getUTCFullYear());
       }

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Remove leading zeros from an array, Given an array of N numbers, the task is to remove all leading zeros from the array. Approach: Mark the first non-zero number's index in the given array. if (​a[i] != 0) {. ind = i;. break ;. } } // if no non-zero number is there. if (ind == -1) { Start learning Data Sructures & Algorithms with the help of the most trusted DSA Self  Just ask them whether it's possible to push back the start date. Make sure to: Emphasise how excited you are about the opportunity. Explain why you'd like to push back the start date. Explain why you didn't bring this up earlier (keep it short, especially if you don't have a good reason). If they say it's fine, your problem is solved.

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Comments
  • Why are you calling the slice method on console.log instead of an instance of an array?