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I created a date object with Keith Wood calendar library with Persian instant:

var d = $.calendars.newDate(1393, 5, 6, 'persian', 'fa');

Now I need to get Julian or Gregorian date from this date but when I use .toJD() function it returns Julian date that does not equal to current date in 

 var e = d.toJD();
 console.log(e)

so how do i fix this problem? I've created a jsbin for this problem .

Pablo Lozano
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MBehtemam
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    Have you tried d.toJSDate()? – Pablo Lozano Jul 28 '14 at 07:10
  • @Pablo it try your way and it returned `Sat May 25 1393 00:00:00 GMT+0430 (Iran Daylight Time)` but the year still 1393 but i need it 2014. – MBehtemam Jul 28 '14 at 07:15
  • I've updated my answer, you can find examples of transformation in the Keith Wood's web – Pablo Lozano Jul 28 '14 at 07:44
  • @MBehtemam Here is my method to convert Persian Dates to any other calendars without external libraries: https://stackoverflow.com/questions/71421825/how-to-convert-persian-jalali-dates-to-other-18-calendar-dates-in-javascript-w/71421832#71421832 – Mohsen Alyafei Mar 10 '22 at 09:50

2 Answers2

7

I think toJD() is not what you need:

var d = $.calendars.newDate(1388, 1, 1, 'persian', 'fa');
console.log("Persian date: "+d.toLocaleString()); // Persian date: 1388-01-01
var e = d.toJSDate();
console.log(e); // Sat Mar 21 2009 00:00:00 GMT+0100 (Romance Standard Time)

UPDATE: For your comment I see the issue is not solved with this because it transforms the Persian date to your locale date. As far as I can see in the library's reference, there is no way to tell to that function which locale should be used. So the correct way, as the author's provided demo shows, is creating another target calendar and pass the current one as parameter:

var d = $.calendars.newDate(1388, 1, 1, 'persian', 'fa');
var e = $.calendars.newDate(d, 'gregorian', 'fa');
Pablo Lozano
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2

An alternative to converting a Persian date to any other calendar date is to use the ECMAScript proposal "Temporal" which is currently in Stage 3 of Active Proposals.

The following function will convert a Persian date to any of the 18 available calendars in Javascript. The default is conversion to the Gregorian date.

You can specify the target Calendar to convert to and also the formatting and locale to use:

<script type='module'>
// ====== load Temp polyfill (not needed after implementation) ========
    import * as TemporalModule from 'https://cdn.jsdelivr.net/npm/@js-temporal/polyfill@0.3.0/dist/index.umd.js'
//=====================================================================


//---------------------------------------
function persianToCalendars(Y, M, D, options={}) {
return new Intl.DateTimeFormat(options.locale??="en",options).format(new Date(temporal.Temporal.PlainDateTime.from({year:Y,month:M,day:D,calendar:'persian'}).toString().split("[")[0]));
}
//---------------------------------------


console.log(persianToCalendars(1400,12,6));    // default

console.log(persianToCalendars(1400,12,6,{dateStyle: "full"}));

console.log(persianToCalendars(1400,12,6,{locale: "fa"}));

console.log(persianToCalendars(1400,12,6,{dateStyle:"full", locale: "fa"}));

console.log(persianToCalendars(1400,12,6,{calendar:"islamic", dateStyle:"full"}));   // to islamic full 'en' locale

console.log(persianToCalendars(1400,12,6,{locale:"fa", calendar:"islamic", dateStyle:"full"}));  // to islamic 'fa' locale


</script>
Mohsen Alyafei
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