MakeDay.jsā¢1.01 kB
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $DateUTC = GetIntrinsic('%Date.UTC%');
var $isFinite = require('math-intrinsics/isFinite');
var DateFromTime = require('./DateFromTime');
var Day = require('./Day');
var floor = require('./floor');
var modulo = require('./modulo');
var MonthFromTime = require('./MonthFromTime');
var ToIntegerOrInfinity = require('./ToIntegerOrInfinity');
var YearFromTime = require('./YearFromTime');
// https://262.ecma-international.org/5.1/#sec-15.9.1.12
module.exports = function MakeDay(year, month, date) {
if (!$isFinite(year) || !$isFinite(month) || !$isFinite(date)) {
return NaN;
}
var y = ToIntegerOrInfinity(year);
var m = ToIntegerOrInfinity(month);
var dt = ToIntegerOrInfinity(date);
var ym = y + floor(m / 12);
if (!$isFinite(ym)) {
return NaN;
}
var mn = modulo(m, 12);
var t = $DateUTC(ym, mn, 1);
if (YearFromTime(t) !== ym || MonthFromTime(t) !== mn || DateFromTime(t) !== 1) {
return NaN;
}
return Day(t) + dt - 1;
};