MJD Class Reference

Class for representing modified Julian dates with high precision. More...

#include <MJD.h>

Public Member Functions
	MJD ()
	null constructor
	MJD (double dd)
	construct from standard C types
	MJD (int intday, double fracday)
	MJD (double dd, double ss, double fs)
	MJD (int dd, int ss, double fs)
	MJD (const char *mjdstring)
	construct from a C string of the form "50312.4569"
	MJD (time_t time)
	some standard C time formats
	MJD (const struct tm &greg)
	MJD (const struct timeval &tp)
	MJD (const utc_t &utc)
	simple little struct invented in S2 days
	MJD (const std::string &mjd)
	construct from a C++ string
int	Construct (const char *mjdstr)
	construct from a string of the form 51298.45034 ish
int	Construct (time_t time)
	construct from the unix time_t
int	Construct (const struct tm &greg)
	construct from the unix struct tm
int	Construct (const struct timeval &tp)
	construct from another UNIX time standard
int	Construct (const utc_t &utc)
	constructs from the home-grown utc_t
int	Construct (uint64_t bat)
	construct from a BAT (binary atomic time), ie MJD in microseconds
double	in_seconds () const
double	in_days () const
double	in_minutes () const
int	UTC (utc_t *utc, double *fsec=NULL) const
int	gregorian (struct tm *gregdate, double *fsec=NULL) const
MJD &	operator= (const MJD &)
MJD &	operator+= (const MJD &)
MJD &	operator-= (const MJD &)
MJD &	operator+= (const double &)
MJD &	operator-= (const double &)
MJD &	operator*= (const double &)
MJD &	operator/= (const double &)
float	plotval () const
	return plotable value to xyplot template class
int	intday () const
double	fracday () const
int	get_secs () const
double	get_fracsec () const
double	LST (double longitude) const
	return Local Sidereal Time in hours
double	GMST () const
	return Greenwich Mean Sidereal Time in radians
std::string	printdays (unsigned precision) const
int	print (FILE *stream)
int	println (FILE *stream)
std::string	printall () const
std::string	printdays () const
std::string	printhhmmss () const
std::string	printfs () const
std::string	strtempo () const
char *	datestr (char *dstr, int len, const char *format) const
	return a string formatted by strftime
std::string	datestr (const char *format, unsigned fractional_second_digits=0) const
	Convenient interface to datestr, with optional fractional seconds.
void	from_datestr (const std::string &datestr, const std::string &format="%Y-%m-%d-%H:%M:%S")
	Parse MJD from the given datestr using strptime and the specified format.

Static Public Attributes
static const MJD	zero
static double	precision = 2.0e-12
static unsigned	ostream_precision = 15
static int	verbose = 0

Friends
const MJD	operator+ (const MJD &m1, const MJD &m2)
const MJD	operator- (const MJD &m1, const MJD &m2)
const MJD	operator+ (const MJD &m1, double sss)
const MJD	operator- (const MJD &m1, double sss)
const MJD	operator* (const MJD &m1, double d)
const MJD	operator* (double a, const MJD &m)
const MJD	operator/ (const MJD &m1, double divisor)
const MJD	operator- (MJD m)
int	operator> (const MJD &m1, const MJD &m2)
int	operator< (const MJD &m1, const MJD &m2)
int	operator>= (const MJD &m1, const MJD &m2)
int	operator<= (const MJD &m1, const MJD &m2)
int	operator== (const MJD &m1, const MJD &m2)
int	operator!= (const MJD &m1, const MJD &m2)
bool	equal (const MJD &m1, const MJD &m2)

Detailed Description

Class for representing modified Julian dates with high precision.

Member Function Documentation

Construct()

int MJD::Construct

(

uint64_t

bat

)

construct from a BAT (binary atomic time), ie MJD in microseconds

Parameters

bat	time stored in two 32 bit unsigned integers, as returned by the AT clock

datestr()

char * MJD::datestr	(	char *	dstr,
		int	len,
		const char *	format ) const

return a string formatted by strftime

Parameters

format

as used by strftime; e.g. "%Y-%m-%d %H:%M:%S"

Referenced by datestr(), and from_datestr().

LST()

double MJD::LST

(

double

longitude

)

const

return Local Sidereal Time in hours

Parameters

(longitude

given in degrees East of Greenwich)

References GMST().

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The documentation for this class was generated from the following files:

• MJD.h
• MJD.C
• sla_MJD.C