java获取当天，前天，明天，本周，本月，本年的开始日期时间和结束日期时间
1 package demoone;
2
3 import java.sql.Timestamp;
4 import java.text.ParseException;
5 import java.text.SimpleDateFormat;
6 import java.util.ArrayList;
7 import java.util.Calendar;
8 import java.util.Date;
9 import java.util.GregorianCalendar;
10 import java.util.List;
11
12 public class DateUtils {
13 //获取当天的开始时间
14 public static java.util.Date getDayBegin() {
15 Calendar cal = new GregorianCalendar();
16 cal.set(Calendar.HOUR_OF_DAY, 0);
17 cal.set(Calendar.MINUTE, 0);
18 cal.set(Calendar.SECOND, 0);
19 cal.set(Calendar.MILLISECOND, 0);
20 return cal.getTime();
21 }
22 //获取当天的结束时间
23 public static java.util.Date getDayEnd() {
24 Calendar cal = new GregorianCalendar();
25 cal.set(Calendar.HOUR_OF_DAY, 23);
26 cal.set(Calendar.MINUTE, 59);
27 cal.set(Calendar.SECOND, 59);
28 return cal.getTime();
29 }
30 //获取昨天的开始时间
31 public static Date getBeginDayOfYesterday() {
32 Calendar cal = new GregorianCalendar();
33 cal.setTime(getDayBegin());
34 cal.add(Calendar.DAY_OF_MONTH, -1);
35 return cal.getTime();
36 }
37 //获取昨天的结束时间
38 public static Date getEndDayOfYesterDay() {
39 Calendar cal = new GregorianCalendar();
40 cal.setTime(getDayEnd());
41 cal.add(Calendar.DAY_OF_MONTH, -1);
42 return cal.getTime();
43 }
44 //获取明天的开始时间
45 public static Date getBeginDayOfTomorrow() {
46 Calendar cal = new GregorianCalendar();
47 cal.setTime(getDayBegin());
48 cal.add(Calendar.DAY_OF_MONTH, 1);
49
50 return cal.getTime();
51 }
52 //获取明天的结束时间
53 public static Date getEndDayOfTomorrow() {
54 Calendar cal = new GregorianCalendar();
55 cal.setTime(getDayEnd());
56 cal.add(Calendar.DAY_OF_MONTH, 1);
57 return cal.getTime();
58 }
59 //获取本周的开始时间
60 public static Date getBeginDayOfWeek() {
61 Date date = new Date();
62 if (date == null) {
63 return null;
64 }
65 Calendar cal = Calendar.getInstance();
66 cal.setTime(date);
67 int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
68 if (dayofweek == 1) {
69 dayofweek += 7;
70 }
71 cal.add(Calendar.DATE, 2 - dayofweek);
72 return getDayStartTime(cal.getTime());
73 }
74 //获取本周的结束时间
75 public static Date getEndDayOfWeek(){
76 Calendar cal = Calendar.getInstance();
77 cal.setTime(getBeginDayOfWeek());
78 cal.add(Calendar.DAY_OF_WEEK, 6);
79 Date weekEndSta = cal.getTime();
80 return getDayEndTime(weekEndSta);
81 }
82 //获取本月的开始时间
83 public static Date getBeginDayOfMonth() {
84 Calendar calendar = Calendar.getInstance();
85 calendar.set(getNowYear(), getNowMonth() - 1, 1);
86 return getDayStartTime(calendar.getTime());
87 }
88 //获取本月的结束时间
89 public static Date getEndDayOfMonth() {
90 Calendar calendar = Calendar.getInstance();
91 calendar.set(getNowYear(), getNowMonth() - 1, 1);
92 int day = calendar.getActualMaximum(5);
93 calendar.set(getNowYear(), getNowMonth() - 1, day);
94 return getDayEndTime(calendar.getTime());
95 }
96 //获取本年的开始时间
97 public static java.util.Date getBeginDayOfYear() {
98 Calendar cal = Calendar.getInstance();
99 cal.set(Calendar.YEAR, getNowYear());
100 // cal.set
101 cal.set(Calendar.MONTH, Calendar.JANUARY);
102 cal.set(Calendar.DATE, 1);
103
104 return getDayStartTime(cal.getTime());
105 }
106 //获取本年的结束时间
107 public static java.util.Date getEndDayOfYear() {
108 Calendar cal = Calendar.getInstance();
109 cal.set(Calendar.YEAR, getNowYear());
110 cal.set(Calendar.MONTH, Calendar.DECEMBER);
111 cal.set(Calendar.DATE, 31);
112 return getDayEndTime(cal.getTime());
113 }
114 //获取某个日期的开始时间
115 public static Timestamp getDayStartTime(Date d) {
116 Calendar calendar = Calendar.getInstance();
117 if(null != d) calendar.setTime(d);
118 calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
119 calendar.set(Calendar.MILLISECOND, 0);
120 return new Timestamp(calendar.getTimeInMillis());
121 }
122 //获取某个日期的结束时间
123 public static Timestamp getDayEndTime(Date d) {
124 Calendar calendar = Calendar.getInstance();
125 if(null != d) calendar.setTime(d);
126 calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23, 59, 59);
127 calendar.set(Calendar.MILLISECOND, 999);
128 return new Timestamp(calendar.getTimeInMillis());
129 }
130 //获取今年是哪一年
131 public static Integer getNowYear() {
132 Date date = new Date();
133 GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
134 gc.setTime(date);
135 return Integer.valueOf(gc.get(1));
136 }
137 //获取本月是哪一月
138 public static int getNowMonth() {
139 Date date = new Date();
140 GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
141 gc.setTime(date);
142 return gc.get(2) + 1;
143 }
144 //两个日期相减得到的天数
145 public static int getDiffDays(Date beginDate, Date endDate) {
146
147 if (beginDate == null || endDate == null) {
148 throw new IllegalArgumentException("getDiffDays param is null!");
149 }
150
151 long diff = (endDate.getTime() - beginDate.getTime())
152 / (1000 * 60 * 60 * 24);
153
154 int days = new Long(diff).intValue();
155
156 return days;
157 }
158 //两个日期相减得到的毫秒数
159 public static long dateDiff(Date beginDate, Date endDate) {
160 long date1ms = beginDate.getTime();
161 long date2ms = endDate.getTime();
162 return date2ms - date1ms;
163 }
164 //获取两个日期中的最大日期
165 public static Date max(Date beginDate, Date endDate) {
166 if (beginDate == null) {
167 return endDate;
168 }
169 if (endDate == null) {
170 return beginDate;
171 }
172 if (beginDate.after(endDate)) {
173 return beginDate;
174 }
175 return endDate;
176 }
177 //获取两个日期中的最小日期
178 public static Date min(Date beginDate, Date endDate) {
179 if (beginDate == null) {
180 return endDate;
181 }
182 if (endDate == null) {
183 return beginDate;
184 }
185 if (beginDate.after(endDate)) {
186 return endDate;
187 }
188 return beginDate;
189 }
190 //返回某月该季度的第一个月
191 public static Date getFirstSeasonDate(Date date) {
192 final int[] SEASON = { 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };
193 Calendar cal = Calendar.getInstance();
194 cal.setTime(date);
195 int sean = SEASON[cal.get(Calendar.MONTH)];
196 cal.set(Calendar.MONTH, sean * 3 - 3);
197 return cal.getTime();
198 }
199 //返回某个日期下几天的日期
200 public static Date getNextDay(Date date, int i) {
201 Calendar cal = new GregorianCalendar();
202 cal.setTime(date);
203 cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);
204 return cal.getTime();
205 }
206 //返回某个日期前几天的日期
207 public static Date getFrontDay(Date date, int i) {
208 Calendar cal = new GregorianCalendar();
209 cal.setTime(date);
210 cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);
211 return cal.getTime();
212 }
213 //获取某年某月到某年某月按天的切片日期集合（间隔天数的日期集合）
214 public static List getTimeList(int beginYear, int beginMonth, int endYear,
215 int endMonth, int k) {
216 List list = new ArrayList();
217 if (beginYear == endYear) {
218 for (int j = beginMonth; j <= endMonth; j++) {
219 list.add(getTimeList(beginYear, j, k));
220
221 }
222 } else {
223 {
224 for (int j = beginMonth; j < 12; j++) {
225 list.add(getTimeList(beginYear, j, k));
226 }
227
228 for (int i = beginYear + 1; i < endYear; i++) {
229 for (int j = 0; j < 12; j++) {
230 list.add(getTimeList(i, j, k));
231 }
232 }
233 for (int j = 0; j <= endMonth; j++) {
234 list.add(getTimeList(endYear, j, k));
235 }
236 }
237 }
238 return list;
239 }
240 //获取某年某月按天切片日期集合（某个月间隔多少天的日期集合）
241 public static List getTimeList(int beginYear, int beginMonth, int k) {
242 List list = new ArrayList();
243 Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);
244 int max = begincal.getActualMaximum(Calendar.DATE);
245 for (int i = 1; i < max; i = i + k) {
246 list.add(begincal.getTime());
247 begincal.add(Calendar.DATE, k);
248 }
249 begincal = new GregorianCalendar(beginYear, beginMonth, max);
250 list.add(begincal.getTime());
251 return list;
252 }
253 }
1 //获取某年某月的第一天日期 2 public static Date getStartMonthDate(int year, int month) { 3 Calendar calendar = Calendar.getInstance(); 4 calendar.set(year, month - 1, 1); 5 return calendar.getTime(); 6 } 7 8 //获取某年某月的最后一天日期 9 public static Date getEndMonthDate(int year, int month) { 10 Calendar calendar = Calendar.getInstance(); 11 calendar.set(year, month - 1, 1); 12 int day = calendar.getActualMaximum(5); 13 calendar.set(year, month - 1, day); 14 return calendar.getTime(); 15 }
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