| Tim van der Lippe | fdbd42e | 2020-04-07 14:14:36 | [diff] [blame] | 1 | 'use strict'; |
| 2 | |
| 3 | var DayWithinYear = require('./DayWithinYear'); |
| 4 | var InLeapYear = require('./InLeapYear'); |
| 5 | |
| Tim van der Lippe | 2c89197 | 2021-07-29 15:22:50 | [diff] [blame^] | 6 | // https://262.ecma-international.org/5.1/#sec-15.9.1.4 |
| Tim van der Lippe | fdbd42e | 2020-04-07 14:14:36 | [diff] [blame] | 7 | |
| 8 | module.exports = function MonthFromTime(t) { |
| 9 | var day = DayWithinYear(t); |
| 10 | if (0 <= day && day < 31) { |
| 11 | return 0; |
| 12 | } |
| 13 | var leap = InLeapYear(t); |
| 14 | if (31 <= day && day < (59 + leap)) { |
| 15 | return 1; |
| 16 | } |
| 17 | if ((59 + leap) <= day && day < (90 + leap)) { |
| 18 | return 2; |
| 19 | } |
| 20 | if ((90 + leap) <= day && day < (120 + leap)) { |
| 21 | return 3; |
| 22 | } |
| 23 | if ((120 + leap) <= day && day < (151 + leap)) { |
| 24 | return 4; |
| 25 | } |
| 26 | if ((151 + leap) <= day && day < (181 + leap)) { |
| 27 | return 5; |
| 28 | } |
| 29 | if ((181 + leap) <= day && day < (212 + leap)) { |
| 30 | return 6; |
| 31 | } |
| 32 | if ((212 + leap) <= day && day < (243 + leap)) { |
| 33 | return 7; |
| 34 | } |
| 35 | if ((243 + leap) <= day && day < (273 + leap)) { |
| 36 | return 8; |
| 37 | } |
| 38 | if ((273 + leap) <= day && day < (304 + leap)) { |
| 39 | return 9; |
| 40 | } |
| 41 | if ((304 + leap) <= day && day < (334 + leap)) { |
| 42 | return 10; |
| 43 | } |
| 44 | if ((334 + leap) <= day && day < (365 + leap)) { |
| 45 | return 11; |
| 46 | } |
| 47 | }; |
