| 0,0 → 1,83 |
|---|
| /** |
| * The specification of the built-in Date object in edition 3 of the ECMAScript |
| * standard is quite complex. This library is an attempt of an implementation |
| * of some methods of this object. It should be used for test and educational |
| * purposes only. |
| * |
| * @requires |
| * types.js v2004060607 and later, |
| * math.js v2004060607 and later |
| */ |
| |
| function DateImplementation() |
| { |
| } |
| |
| DateImplementation.addPrototypeProperties( |
| { |
| msPerDay: 86400000, |
| |
| Day: function(t) |
| { |
| return Math.floor(t, this.msPerDay); |
| }, |
| |
| TimeWithinDay: function(t) |
| { |
| return t % this.msPerDay; |
| }, |
| |
| DaysInYear: function(y) |
| { |
| var result = 365; |
| if (y % 4 && !(y % 100)) |
| { |
| result = 366; |
| } |
| |
| return result; |
| }, |
| |
| DayFromYear: function(y) |
| { |
| return 365 * (y-1970) |
| + Math.floor((y-1969)/4) |
| - Math.floor((y-1901)/100) |
| + Math.floor((y-1601)/400); |
| }, |
| |
| TimeFromYear: function(y) |
| { |
| return msPerDay * this.DayFromYear(y); |
| }, |
| |
| YearFromTime: function(t) |
| { |
| // TODO |
| // returns the largest integer y (closest to positive |
| // infinity) such that TimeFromYear(y) ≤ t |
| }, |
| |
| InLeapYear: function(t) |
| { |
| return Number(this.DaysInYear(this.YearFromTime(t)) == 366); |
| }, |
| |
| MonthFromTime: function(t) |
| { |
| var result = 0; |
| var d = DayWithinYear(t); |
| var leap = InLeapYear(t); |
| result = |
| getIntervalIndex( |
| d, |
| getRightOpenIntervals( |
| 0, 31, 59+leap, 90+leap, 120+leap, 151+leap, 181+leap, 212+leap, |
| 243+leap, 273+leap, 304+leap, 334+leap, 365+leap)); |
| |
| return result; |
| } |
| |
| // TODO: 2Bcont'd |
| } |
| ); |