55 lines
1.0 KiB
JavaScript
55 lines
1.0 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $EvalError = GetIntrinsic('%EvalError%');
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var DayWithinYear = require('./DayWithinYear');
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var InLeapYear = require('./InLeapYear');
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var MonthFromTime = require('./MonthFromTime');
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// https://262.ecma-international.org/5.1/#sec-15.9.1.5
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module.exports = function DateFromTime(t) {
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var m = MonthFromTime(t);
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var d = DayWithinYear(t);
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if (m === 0) {
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return d + 1;
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}
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if (m === 1) {
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return d - 30;
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}
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var leap = InLeapYear(t);
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if (m === 2) {
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return d - 58 - leap;
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}
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if (m === 3) {
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return d - 89 - leap;
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}
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if (m === 4) {
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return d - 119 - leap;
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}
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if (m === 5) {
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return d - 150 - leap;
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}
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if (m === 6) {
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return d - 180 - leap;
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}
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if (m === 7) {
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return d - 211 - leap;
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}
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if (m === 8) {
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return d - 242 - leap;
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}
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if (m === 9) {
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return d - 272 - leap;
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}
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if (m === 10) {
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return d - 303 - leap;
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}
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if (m === 11) {
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return d - 333 - leap;
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}
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throw new $EvalError('Assertion failed: MonthFromTime returned an impossible value: ' + m);
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};
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