sff_timeadd__()

int sff_timeadd__	(	integer *	year1,
		integer *	doy1,
		integer *	hour1,
		integer *	minute1,
		real *	second1,
		integer *	year2,
		integer *	doy2,
		integer *	hour2,
		integer *	minute2,
		real *	second2,
		integer *	year,
		integer *	doy,
		integer *	hour,
		integer *	minute,
		real *	second
	)