File: time-tools.c

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/*
    Gpredict: Real-time satellite tracking and orbit prediction program

    Copyright (C)  2001-2009  Alexandru Csete, OZ9AEC.

    Authors: Alexandru Csete <oz9aec@gmail.com>

    Comments, questions and bugreports should be submitted via
    http://sourceforge.net/projects/gpredict/
    More details can be found at the project home page:

            http://gpredict.oz9aec.net/
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
  
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
  
    You should have received a copy of the GNU General Public License
    along with this program; if not, visit http://www.fsf.org/
*/

#include <glib.h>
#include <glib/gi18n.h>
//#include <sys/time.h>
#ifdef HAVE_CONFIG_H
#  include <build-config.h>
#endif
#include "sgpsdp/sgp4sdp4.h"
#include "time-tools.h"
//#ifdef G_OS_WIN32
//#  include "libc_internal.h"
//#  include "libc_interface.h"
//#endif



/** \brief Get the current time.
 *
 * Read the system clock and return the current Julian day.
 */
gdouble
get_current_daynum ()
{
	struct tm utc;
	//struct timeval tmval;
	GTimeVal tmval;
	double daynum;

	UTC_Calendar_Now (&utc);
	//gettimeofday (&tmval, NULL);
	g_get_current_time (&tmval);
	daynum = Julian_Date (&utc);
	daynum = daynum + (double)tmval.tv_usec/8.64e+10;
 
	return daynum;
}


long
get_daynum_from_dmy (int d, int m, int y)
{
	/* This function calculates the day number from m/d/y. */

	long dn;
	double mm, yy;

	if (m<3)
	{ 
		y--; 
		m+=12; 
	}

	if (y<57)
		y+=100;

	yy=(double)y;
	mm=(double)m;
	dn=(long)(floor(365.25*(yy-80.0))-floor(19.0+yy/100.0)+floor(4.75+yy/400.0)-16.0);
	dn+=d+30*m+(long)floor(0.6*mm-0.3);

	return dn;
}