/afs/in2p3.fr/throng/virgo/virgoDev/SoftFlorent/GWOLLUM/v2r2/src/Time/Date.h

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/*
 *  Copyright (C) 2012 Karl Wette
 *  Copyright (C) 2007 Duncan Brown, David Chin, Jolien Creighton, Kipp Cannon, Reinhard Prix, Stephen Fairhurst
 */

#ifndef _DATE_H
#define _DATE_H

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include "LeapSeconds.h" /* contains the leap second table */

#ifdef  __cplusplus
extern "C"
{
#endif

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#define EPOCH_J2000_0_JD 2451545.0         
#define EPOCH_UNIX_GPS 315964800
#define EPOCH_GPS_TAI_UTC 19               
/* Returns the leap seconds TAI-UTC at a given GPS second. */
int LeapSeconds(int gpssec);

/* Returns the leap seconds TAI-UTC for a given UTC broken down time. */
int LeapSecondsUTC(const struct tm *utc);

/* Returns a pointer to a tm structure representing the time
 * specified in seconds since the GPS epoch.  */
struct tm* GPSToUTC(struct tm *utc, int gpssec);
/* Returns the GPS seconds for a specified UTC time structure. */
int UTCToGPS( const struct tm *utc );

double JulianDay(const struct tm *utc);

/* Returns the Greenwich mean or aparent sideral time in radians. */
double GreenwichSiderealTime(const double gpstime, double equation_of_equinoxes);

/* Returns the Greenwich Mean Sidereal Time in RADIANS for a specified GPS time. */
double GreenwichMeanSiderealTime(const double gpstime);

#ifdef  __cplusplus
}
#endif

#endif /* _DATE_H */

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