25     months m1(5), m2(3), m3(1);  in main()
26     check("months & months addable", months(8) == m1 + m2);  in main()
28     check("months & months addable", months(8) == m1);  in main()
29     check("months & months subtractable", months(-5) == m2 - m1);  in main()
31     check("months & months subtractable", months(-5) == m2);  in main()
37           d1 + months(-1) == date(2004,Dec,1));  in main()
39           d2 + months(-1) == date(2005,Jan,1));  in main()
41           d2 + months(-2) == date(2004,Dec,1));  in main()
43           d2 + months(-12) == date(2004,Feb,1));  in main()
45           d2 + months(-13) == date(2004,Jan,1));  in main()
47           d2 + months(-14) == date(2003,Dec,1));  in main()
51           d3 - months(-1) == date(2006,Jan,1));  in main()
53           d4 - months(-1) == date(2005,Dec,1));  in main()
55           d4 - months(-2) == date(2006,Jan,1));  in main()
57           d4 - months(-12) == date(2006,Nov,1));  in main()
59           d4 - months(-13) == date(2006,Dec,1));  in main()
61           d4 - months(-14) == date(2007,Jan,1));  in main()
64       months m1(5), m2(3), m3(10);  in main()
65       check("months & int multipliable", months(15) == m1 * 3);  in main()
67       check("months & int multipliable", months(15) == m1);  in main()
69       check("months & int dividable", months(3) == m3 / 3);  in main()
71       check("months & int dividable", months(3) == m3);  in main()
74       months m(-5), m_pos(pos_infin), m_neg(neg_infin), m_nadt(not_a_date_time);  in main()
88     check("months & years addable", months(25) == m3 + y1);  in main()
90     check("months & years addable", months(25) == m3);  in main()
91     check("months & years subtractable", months(-23) == m3 - y2);  in main()
93     check("months & years subtractable", months(-23) == m3);  in main()
97       check("date + months", date(2002, Feb, 28) == d + months(4));  in main()
98       d += months(4);  in main()
103       check("date - months", date(2001, Apr, 30) == d - months(6));  in main()
104       d -= months(6);  in main()
142     months m1(5), m2(3);  in main()
143     check("years & months addable", months(51) == y2 + m2);  in main()
144     check("years & months subtractable", months(43) == y2 - m1);  in main()
201     date d2 = d + months(4) + years(2);  in main()
202     date d3 = d + years(2) + months(4);  in main()
205     months m = years(2) + months(4) - months(4) - years(2);  in main()