const jalaali = require('jalaali-js')
// this implementation is node.js's built-in API which is based on unicode-org/icu
const intl = new Intl.DateTimeFormat("fa-IR", {
numberingSystem: 'latn',
year: 'numeric',
month: '2-digit',
day: '2-digit'
});
const getIntlDate = (date) => intl.format(new Date(date));
// this implementation is based on jalaali-js
const getJalaaliDate = (date) => {
const zeroPad = (num) => num < 10 ? `0${num}` : num;
const { jy, jm, jd } = jalaali.toJalaali(new Date(date));
return `${jy}/${zeroPad(jm)}/${zeroPad(jd)}`;
}
const compareIntlVsJalaali = (date) => ({
intlDate: getIntlDate(date),
jalaaliDate: getJalaaliDate(date),
});
const findContradictionInIntlVsJalaali = () => {
const startingDate = new Date('1800-01-01');
const oneDay = 24 * 60 * 60 * 1000;
let count = 0;
while (true) {
const date = new Date(count * oneDay + startingDate.getTime())
const { intlDate, jalaaliDate } = compareIntlVsJalaali(date);
if (intlDate !== jalaaliDate) {
return { intlDate, jalaaliDate };
}
count++;
}
}
console.log("first inconsistency in jalali leap years (intl vs jalaali):");
console.log(findContradictionInIntlVsJalaali());
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