Clean Code

Appendix B: 
org.jfree.date.SerialDate
92 day = lastDayOfMonth;
93 return day;
94 }
95 
96 public DayDate getPreviousDayOfWeek(Day targetDayOfWeek) {
97 int offsetToTarget = targetDayOfWeek.toInt() - getDayOfWeek().toInt();
98 if (offsetToTarget >= 0)
99 offsetToTarget -= 7;
100 return plusDays(offsetToTarget);
101 }
102 
103 public DayDate getFollowingDayOfWeek(Day targetDayOfWeek) {
104 int offsetToTarget = targetDayOfWeek.toInt() - getDayOfWeek().toInt();
105 if (offsetToTarget <= 0)
106 offsetToTarget += 7;
107 return plusDays(offsetToTarget);
108 }
109 
110 public DayDate getNearestDayOfWeek(Day targetDayOfWeek) {
111 int offsetToThisWeeksTarget = targetDayOfWeek.toInt() - getDayOfWeek().toInt();
112 int offsetToFutureTarget = (offsetToThisWeeksTarget + 7) % 7;
113 int offsetToPreviousTarget = offsetToFutureTarget - 7;
114 
115 if (offsetToFutureTarget > 3)
116 return plusDays(offsetToPreviousTarget);
117 else
118 return plusDays(offsetToFutureTarget);
119 }
120 
121 public DayDate getEndOfMonth() {
122 Month month = getMonth();
123 int year = getYear();
124 int lastDay = DateUtil.lastDayOfMonth(month, year);
125 return DayDateFactory.makeDate(lastDay, month, year);
126 }
127 
128 public Date toDate() {
129 final Calendar calendar = Calendar.getInstance();
130 int ordinalMonth = getMonth().toInt() - Month.JANUARY.toInt();
131 calendar.set(getYear(), ordinalMonth, getDayOfMonth(), 0, 0, 0);
132 return calendar.getTime();
133 }
134 
135 public String toString() {
136 return String.format("%02d-%s-%d", getDayOfMonth(), getMonth(), getYear());
137 }
138 
139 public Day getDayOfWeek() {
140 Day startingDay = getDayOfWeekForOrdinalZero();
141 int startingOffset = startingDay.toInt() - Day.SUNDAY.toInt();
142 int ordinalOfDayOfWeek = (getOrdinalDay() + startingOffset) % 7;
143 return Day.fromInt(ordinalOfDayOfWeek + Day.SUNDAY.toInt());
144 }
145 
146 public int daysSince(DayDate date) {
147 return getOrdinalDay() - date.getOrdinalDay();
148 }
149 
150 public boolean isOn(DayDate other) {
151 return getOrdinalDay() == other.getOrdinalDay();
152 }
153