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finmath lib is a Mathematical Finance Library in Java. It provides algorithms and methodologies related to mathematical finance.

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/*
 * (c) Copyright Christian P. Fries, Germany. Contact: [email protected].
 *
 * Created on 07.09.2013
 */

package net.finmath.time.daycount;

import java.io.Serializable;
import java.time.LocalDate;

/**
 * Implementation of ACT/365.
 *
 * Calculates the day count by calculating the actual number of days between startDate and endDate.
 *
 * A fractional day is rounded to the approximately nearest day.
 *
 * The day count fraction is calculated using ACT/365 convention, that is, the
 * day count is divided by 365.
 *
 * 
 * 	
 * 		The method {@link #getDaycountFraction(LocalDate, LocalDate) getDaycountFraction} corresponds to the implementation of the "ACT/365 method" of Excel function YEARFRAC, i.e., YEARFRAC(startDate,endDate,3).
 * 	
 * 
 *
 * @author Christian Fries
 * @version 1.0
 */
public class DayCountConvention_ACT_365 extends DayCountConvention_ACT implements Serializable {

	private static final long serialVersionUID = 6805037680877652658L;

	/**
	 * Create an ACT/365 day count convention.
	 */
	public DayCountConvention_ACT_365() {
	}

	@Override
	public double getDaycountFraction(final LocalDate startDate, final LocalDate endDate) {
		if(startDate.isAfter(endDate)) {
			return -getDaycountFraction(endDate,startDate);
		}

		final double daycountFraction = getDaycount(startDate, endDate) / 365.0;

		return daycountFraction;
	}
}