{
    details = {
	CLST = {abbrev = CLST; isDST = 0; offset = "-4:00:00"; };
	CLDT = {abbrev = CLDT; isDST = 1; offset = "-3:00:00"; };
    };
    rules = (
	{
	    startDate = "Sun Mar 31 03:00:00 1977 GMT";
	    endDate = "Sun Oct 25 03:00:00 2037 GMT";
	    transitions = (
		{ date = "March/third Sunday/0:00:00";   detail = CLDT; },
		{ date = "October/third Sunday/0:00:00"; detail = CLST; }
	    );
	}
    );
}