Javascript function to convert date yyyy/mm/dd to dd/mm/yy

I am trying to create a function on javascript to bring the date from my database in format (yyyy-mm-dd) and display it on the page as (dd/mm/yy).

I would 开发者_如何学Cappreciate any help.

Thanks.

PD: Let me know if you need more clarification.

---

If you're sure that the date that comes from the server is valid, a simple RegExp can help you to change the format:

function formatDate (input) {
  var datePart = input.match(/\d+/g),
  year = datePart[0].substring(2), // get only two digits
  month = datePart[1], day = datePart[2];

  return day+'/'+month+'/'+year;
}

formatDate ('2010/01/18'); // "18/01/10"

---

Easiest way, assuming you're not bothered about the function being dynamic:

function reformatDate(dateStr)
{
  var dArr = dateStr.split("-");  // ex input: "2010-01-18"
  return dArr[2]+ "/" +dArr[1]+ "/" +dArr[0].substring(2); //ex output: "18/01/10"
}

---

Do it in one line:

date.split("-").reverse().join("-");

// 2021-09-16 => 16-09-2021

---

Use any one of this js function to convert date yyyy/mm/dd to dd/mm/yy

Type 1

function ChangeFormateDate(oldDate){
   var p = dateString.split(/\D/g)
   return [p[2],p[1],p[0] ].join("/")
}

Type 2

function ChangeFormateDate(oldDate)
{
   return oldDate.toString().split("/").reverse().join("/");
}

You can call those Functions by using :

ChangeFormateDate("2018/12/17") //"17/12/2018"

---

Use functions getDateFromFormat() and formatDate() from this source: http://mattkruse.com/javascript/date/source.html
Examples are also there

---

You may also want to look into using date.js:

http://www.datejs.com

To futureproof your application, you may want to return time in a UTC timestamp and format with JavaScript. This'll allow you to support different formats for different countries (in the U.S., we are most familiar with DD-MM-YYYY, or instance) as well as timezones.

---

Try this:

function convertDate(dateString){
  var p = dateString.split(/\D/g)
  return [p[2],p[1],p[0] ].join("-")
}

convertDate("2001-9-11")//"11-9-2001"

---

You can also use destructuring and template literals in case you are sure that you will always receive a date in YYYY-MM-DD.

const changeDateFormatTo = date => {
  const [yy, mm, dd] = date.split(/-/g);
  return `${dd}/${mm}/${yy}`;
};

const formattedDate = changeDateFormatTo("2019-08-14");
console.log(`Formatted date is: ${formattedDate}`);

---

It's a simple case, but everyone is using string methods! This is a little barbaric :-)

The Date object is all set up for this, and will get you much further once you get the hang of it. Your date has no timezone, so I suggest you force UTC both on the way in and the way out. The en-GB locale forces dd-mm, but you should bear in mind that English speaking users are split down the middle on date format, and each half finds the other's format totally confusing. You should really try and make your numeric date format adapt to the preferences of the user, especially since it's easy!

So...

new Vue({
  el: '#vueRoot',
  data: {kennedy: '1963-11-22'},
  computed:{
    kennedyDdmm(){
      return new Date(this.kennedy + 'T00:00:00Z')
      .toLocaleDateString('en-GB',{timeZone:'UTC'})
    },
    kennedyAuto(){
      return new Date(this.kennedy + 'T00:00:00Z')
      .toLocaleDateString([],{timeZone:'UTC'})
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id='vueRoot'>
  <h1>in => {{kennedy}}</h1>
  <h1>dd-MM-yy => {{kennedyDdmm}}</h1>
  <h1>respect user prefs => {{kennedyAuto}}</h1>
</div>

---

function formatDate(date) {

  const [year, month, day] = date.split('-');

  return `${day}.${month}.${year}`;

};