netDxf/DrawingTime.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.com)
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

using System;

namespace netDxf
{
    /// <summary>
    /// Utility functions to handle DateTime conversions.
    /// </summary>
    public class DrawingTime
    {
        /// <summary>
        /// Calculates a date represented as &lt;Julian date&gt;.&lt;Fraction of day&gt; from a <see cref="DateTime">DateTime</see> instance.
        /// </summary>
        /// <param name="date"><see cref="DateTime">DateTime</see> instance.</param>
        /// <returns>The date represented as &lt;Julian date&gt;.&lt;Fraction of day&gt; equivalent to the <see cref="DateTime">DateTime</see> instance.</returns>
        public static double ToJulianCalendar(DateTime date)
        {
            int year = date.Year;
            int month = date.Month;
            int day = date.Day;
            double hour = date.Hour;
            double minute = date.Minute;
            double second = date.Second;
            double millisecond = date.Millisecond;
            double fraction = day + hour/24.0 + minute/1440.0 + (second + millisecond / 1000)/86400.0;

            if (month < 3)
            {
                year = year - 1;
                month = month + 12;
            }

            int a = year/100;
            int b = 2 - a + (a/4);
            int c;
            if (year < 0)
                c = (int) ((365.25*year) - 0.75);
            else
                c = (int) (365.25*year);