status.i4.v = clinks_is_dst_c(clinks.u4.v, is_dst.i4.r)

	This routine determines if a date in clinks corresponds to a
	DST period.  Please see clinks_now for the definition of clinks.

	clinks		date in clinks
	is_dst		returned DST logical
			(TRUE -> clinks value corresponds to a DST period,
			 FALSE -> clinks value does not correspond to a
				  DST period)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid clink value supplied

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	clinks_to_date, date_to_clinks, clinks_now, clinks_to_day_of_week_c,
	get_date_clinks, convert_compare_date_to_clinks, db_date_to_clinks,
	db_date_to_date_c, convert_seconds_c, clinks_to_special_time_c,
	clinks_to_julian_date_c, julian_date_to_clinks_c,
	clinks_to_seconds_into_day_c, timezone_info

	C/C++ usage:

	int	status;
	int	is_dst;
	unsigned int	clinks = 811353627;

	status = clinks_is_dst_c(clinks,&is_dst);