My friend has asked me to do what is apparently a giant pain, which is to convert dates from a date picker into natural language in first english then also french because he is a notary who wants a tool to copy/paste natural dates into his documents so he doesn't make errors.

The desired output format would be: twenty-fourth day of January two thousand and twenty-two

I've gone through about 8 existing libraries but none seem to do calendar day or year in natural language.

CodePudding user response：

The way to do this would be to convert each entity of date separately. (The answer uses a reference to Transform numbers to words in lakh / crore system to convert year to words which is modified to your use case.)

var a = ['','one ','two ','three ','four ', 'five ','six ','seven ','eight ','nine ','ten ','eleven ','twelve ','thirteen ','fourteen ','fifteen ','sixteen ','seventeen ','eighteen ','nineteen '];
var b = ['', '', 'twenty','thirty','forty','fifty', 'sixty','seventy','eighty','ninety'];



function yearInWords (num) {
    if ((num = num.toString()).length > 9) return 'overflow';
    n = ('000000000'   num).substr(-9).match(/^(\d{2})(\d{2})(\d{2})(\d{1})(\d{2})$/);
    if (!n) return; var str = '';
    str  = (n[1] != 0) ? (a[Number(n[1])] || b[n[1][0]]   ' '   a[n[1][1]])   'crore ' : '';
    str  = (n[2] != 0) ? (a[Number(n[2])] || b[n[2][0]]   ' '   a[n[2][1]])   'lakh ' : '';
    str  = (n[3] != 0) ? (a[Number(n[3])] || b[n[3][0]]   ' '   a[n[3][1]])   'thousand ' : '';
    str  = (n[4] != 0) ? (a[Number(n[4])] || b[n[4][0]]   ' '   a[n[4][1]])   'hundred ' : '';
    str  = (n[5] != 0) ? ((str != '') ? 'and ' : '')   (a[Number(n[5])] || b[n[5][0]]   (a[n[5][1]] ? '-' : '')   a[n[5][1]]) : '';
    return str;
}

 var days = ['first','second','third','fourth','fifth', 'sixth','seventh','eigth','ninth','tenth','eleventh','twelth','thirteenth','fouteenth','fifteenth','sixteenth','seventeen',
 'eighteenth','nineteenth', 'twentieth', 'twenty', 'thirtieth', 'thirty'];

 function dayInWords (num) {
    if(num > 31) return 'invalid day';
    if(num < 21) return days[num-1];
    if(num < 30) return days[20]   '-'   days[(num % 10)-1];
    if(num == 30) return days[21];
    return days[22]   '-'   days[(num % 10)-1];
    return str;
}

let date = new Date("01/31/2022");
let day = dayInWords(date.getDate());
let month = date.toLocaleString('default', { month: 'long' });
let year = yearInWords(date.getFullYear());
finalDateInWords = day   ' day of '   month   ' '   year;
console.log(finalDateInWords);

CodePudding user response：

Yep, that did it, Thanks!. Made a quick mod to the last bit so I could call it from my main script:

function englisDate(_date){
  let date = new Date(_date);
  let day = dayInWords(date.getDate());
  let month = date.toLocaleString('default', { month: 'long' });
  let year = yearInWords(date.getFullYear());
  finalDateInWords = day   ' day of '   month   ' '   year;
  console.log(finalDateInWords);
  return(finalDateInWords);
}