ConvertFromG2JD.js

toJD: function(year, month, day) {
		var date = this._validate(year, month, day,
			$.calendars.local.invalidDate || $.calendars.regional[''].invalidDate);
		year = date.year();
		month = date.month();
		day = date.day();
		if (year < 0) { year++; } // No year zero
		// Jean Meeus algorithm, "Astronomical Algorithms", 1991
		if (month < 3) {
			month += 12;
			year--;
		}
		var a = Math.floor(year / 100);
		var b = 2 - a + Math.floor(a / 4);
		return Math.floor(365.25 * (year + 4716)) +
			Math.floor(30.6001 * (month + 1)) + day + b - 1524.5;
	}