How to extract date from string using javascript

Maybe this could help you (Demo Fiddle here):

function getDate(d)
{
    var day, month, year;

    result = d.match("[0-9]{2}([\-/ \.])[0-9]{2}[\-/ \.][0-9]{4}");
    if(null != result) {
        dateSplitted = result[0].split(result[1]);
        day = dateSplitted[0];
        month = dateSplitted[1];
        year = dateSplitted[2];
    }
    result = d.match("[0-9]{4}([\-/ \.])[0-9]{2}[\-/ \.][0-9]{2}");
    if(null != result) {
        dateSplitted = result[0].split(result[1]);
        day = dateSplitted[2];
        month = dateSplitted[1];
        year = dateSplitted[0];
    }

    if(month>12) {
        aux = day;
        day = month;
        month = aux;
    }

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

RegEX will help you to extract date with Different Type of format and It returns as Array,

let str="dd/mm/yyyy06/06/2018 yyyy/mm/dd 2018/02/12 d/m/yy 1/1/18 dd/mm/yy 18/12/12 mm/d/yyyy 12/2/2018 m/dd/yyyy 1/12/2018 yy/m/d 18/1/1 yy/mm/d 18/12/1 yyyy/2018/1/1";
str.match(/(\d{1,4}([.\-/])\d{1,2}([.\-/])\d{1,4})/g);

Reference Link From regextester

I think you can use regex for this. The main three expressions that you need are the following:

[0-9]{4} // year
(0[1-9]|1[0-2]) // month
(0[1-9]|[1-2][0-9]|3[0-1]) // day

You can combine these to fit the formats you mentioned, for example, to match "31.07.2014":

(0[1-9]|[1-2][0-9]|3[0-1])\.(0[1-9]|1[0-2])\.[0-9]{4}

Or "31/07/2014":

(0[1-9]|[1-2][0-9]|3[0-1])\/(0[1-9]|1[0-2])\/[0-9]{4}

You can decide which formats you need and create one regex expression separating the formats with the OR operator |.

function myFunction() {
    var str = "Teen.Wolf.Orphaned.28.07.2014.HDTV";
    var res = str.split(".");


    var text = "";
    var x;
    for (x in res) {
        if (!isNaN(res[x])) {
            text += res[x];
            if (text.length == 2) { text += ','} 
            else if (text.length == 5) { text += ',' } 
        }
    }

    document.write(text);
}

This will write "28,07,2014"

NOTE: only use this way if the strings will always be in a format similar to the ones you posted above.

I had a similar usecase and I used and changed @lpg's answer to fit my needs. I needed to parse invoice dates that will have all sorts of date formats. I included an option to parse month names. As I live in Belgium, most dates are formatted dd-mm-yyyy or dd-mmmm-yyyy , so I assumed dates will most likely have this format. It's easy to swap parts of the regex to swap months and days. Some explanation is included in the comments of the code.

It's also easy enough to translate month names. Note: In dutch we don't use the format "may 3th 2023" so I didn't include this.

I ended up using this:

function parseStringedDate(d) {


  /*
  Valid separators => . - / *space* (dot dash slash and space)
  Detexted formats => 
  dd mm yyyy 
  d mm yyyy
  d m yyyy
  yyyy mm dd
  yyyy m d
  d mmmm yyyy
  mmmm d yyyy
  */


  // Object to map month names to numbers
  const monthsConfig = {
    "januari": 0,
    "februari": 1,
    "maart": 2,
    "april": 3,
    "mei": 4,
    "juni": 5,
    "juli": 6,
    "augustus": 7,
    "september": 8,
    "oktober": 9,
    "november": 10,
    "december": 11
  };

  var day, month, year, result, dateSplitted;

  // dd-mm-yyyy  || d-mm-yyyy || mm-dd-yyyy || m-d-yyyy || mm-d-yyyy || m-dd-yyyy
  result = d.match("[0-9]{1,2}([\-/ \.])[0-9]{1,2}[\-/ \.][0-9]{4}");
  if (null != result) {
    dateSplitted = result[0].split(result[1]);
    day = parseInt(dateSplitted[0]);
    month = parseInt(dateSplitted[1]) - 1;
    year = parseInt(dateSplitted[2]);
  }


  // yyyy-mm-dd || yyyy-mm-d || yyyy-m-dd || yyyy-m-d || yyyy-mm-d || yyyy-dd-m || yyyy-d-mm
  result = d.match("[0-9]{4}([\-/ \.])[0-9]{1,2}[\-/ \.][0-9]{1,2}");
  if (null != result) {
    dateSplitted = result[0].split(result[1]);
    day = dateSplitted[2];
    month = parseInt(dateSplitted[1]) - 1;
    year = dateSplitted[0];
  }

  // dd-mmmm-yyyy || d-mmmm-yyyy
  result = d.match("[0-9]{1,2}([\-/ \.])[a-zA-Z]{3,}[\-/ \.][0-9]{4}");
  if (null != result) {
    dateSplitted = result[0].split(result[1]);
    day = dateSplitted[0];
    month = monthsConfig[dateSplitted[1]]
    year = dateSplitted[2];
  }

  // mmmm-dd-yyyy
  result = d.match("[a-zA-Z]{3,}[\-/ \.][0-9]{1,2}([\-/ \.])[0-9]{4}");
  if (null != result) {
    dateSplitted = result[0].split(result[1]);
    month = monthsConfig[dateSplitted[0]]
    day = dateSplitted[1];
    year = dateSplitted[2];
  }


  day = parseInt(day)
  month = parseInt(month)
  year = parseInt(year)


  if (!day || month === undefined || !year) {
    throw new Error("Invalid date format...")
  }

  // If the month is larger then 11, it is not a month, but a day for sure. Swap variables...
  if (month > 11) {
    let aux
    aux = day;
    day = month;
    month = aux;
    month-- // what was tought to be a day, was actually a month, so we need to substract 1, as months are zero based.
    day++   // restore the day, we accidently changed the day -1 in the previous code because we tought it was a month.
  }


  const jsDate = new Date(year, month, day)

  if (!jsDate instanceof Date) {
    throw new Error("Invalid date format...")
  }

  return jsDate.toISOString().split('T')[0]

}