IT忍者神龟之Java获取各种常用时间
2016-04-24 21:28
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本人之前做的项目中积累常用的时间方法
Java代码
4. import java.text.DateFormat;
5. import java.text.ParsePosition;
6. import java.text.SimpleDateFormat;
7. import java.util.Calendar;
8. import java.util.Date;
9. import java.util.GregorianCalendar;
10.
11. public class TimeTest {
12. //用来全局控制 上一周，本周，下一周的周数变化
13. private int weeks = 0;
14. private int MaxDate;//一月最大天数
15. private int MaxYear;//一年最大天数
16.
17.
18. /**
19. * @param args
20. */
21. public static void main(String[] args) {
22. TimeTest tt = new TimeTest();
23. System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd"));
24. System.out.println("获取本周一日期:"+tt.getMondayOFWeek());
25. System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday());
26. System.out.println("获取上周一日期:"+tt.getPreviousWeekday());
27. System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday());
28. System.out.println("获取下周一日期:"+tt.getNextMonday());
29. System.out.println("获取下周日日期:"+tt.getNextSunday());
30. System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd"));
31. System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth());
32. System.out.println("获取本月最后一天日期:"+tt.getDefaultDay());
33. System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst());
34. System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd());
35. System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst());
36. System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd());
37. System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst());
38. System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd());
39. System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst());
40. System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd());
41. System.out.println("获取明年第一天日期:"+tt.getNextYearFirst());
42. System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd());
43. System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11));
44. System.out.println("获取两个日期之间间隔天数2008-12-1~2008-9.29:"+TimeTest.getTwoDay("2008-12-1","2008-9-29"));
45. }
46.
47.
48. /**
49. * 得到二个日期间的间隔天数
50. */
51. public static String getTwoDay(String sj1, String sj2) {
52. SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
53. long day = 0;
54. try {
55. java.util.Date date = myFormatter.parse(sj1);
56. java.util.Date mydate = myFormatter.parse(sj2);
57. day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
58. } catch (Exception e) {
59. return "";
60. }
61. return day + "";
62. }
63.
64.
65. /**
66. * 根据一个日期，返回是星期几的字符串
67. *
68. * @param sdate
69. * @return
70. */
71. public static String getWeek(String sdate) {
72. // 再转换为时间
73. Date date = TimeTest.strToDate(sdate);
74. Calendar c = Calendar.getInstance();
75. c.setTime(date);
76. // int hour=c.get(Calendar.DAY_OF_WEEK);
77. // hour中存的就是星期几了，其范围 1~7
78. // 1=星期日 7=星期六，其他类推
79. return new SimpleDateFormat("EEEE").format(c.getTime());
80. }
81.
82. /**
83. * 将短时间格式字符串转换为时间 yyyy-MM-dd
84. *
85. * @param strDate
86. * @return
87. */
88. public static Date strToDate(String strDate) {
89. SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
90. ParsePosition pos = new ParsePosition(0);
91. Date strtodate = formatter.parse(strDate, pos);
92. return strtodate;
93. }
94.
95. /**
96. * 两个时间之间的天数
97. *
98. * @param date1
99. * @param date2
100. * @return
101. */
102. public static long getDays(String date1, String date2) {
103. if (date1 == null || date1.equals(""))
104. return 0;
105. if (date2 == null || date2.equals(""))
106. return 0;
107. // 转换为标准时间
108. SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
109. java.util.Date date = null;
110. java.util.Date mydate = null;
111. try {
112. date = myFormatter.parse(date1);
113. mydate = myFormatter.parse(date2);
114. } catch (Exception e) {
115. }
116. long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
117. return day;
118. }
119.
120.
121.
122.
123. // 计算当月最后一天,返回字符串
124. public String getDefaultDay(){
125. String str = "";
126. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
127.
128. Calendar lastDate = Calendar.getInstance();
129. lastDate.set(Calendar.DATE,1);//设为当前月的1号
130. lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号
131. lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
132.
133. str=sdf.format(lastDate.getTime());
134. return str;
135. }
136.
137. // 上月第一天
138. public String getPreviousMonthFirst(){
139. String str = "";
140. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
141.
142. Calendar lastDate = Calendar.getInstance();
143. lastDate.set(Calendar.DATE,1);//设为当前月的1号
144. lastDate.add(Calendar.MONTH,-1);//减一个月，变为下月的1号
145. //lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
146.
147. str=sdf.format(lastDate.getTime());
148. return str;
149. }
150.
151. //获取当月第一天
152. public String getFirstDayOfMonth(){
153. String str = "";
154. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
155.
156. Calendar lastDate = Calendar.getInstance();
157. lastDate.set(Calendar.DATE,1);//设为当前月的1号
158. str=sdf.format(lastDate.getTime());
159. return str;
160. }
161.
162. // 获得本周星期日的日期
163. public String getCurrentWeekday() {
164. weeks = 0;
165. int mondayPlus = this.getMondayPlus();
166. GregorianCalendar currentDate = new GregorianCalendar();
167. currentDate.add(GregorianCalendar.DATE, mondayPlus+6);
168. Date monday = currentDate.getTime();
169.
170. DateFormat df = DateFormat.getDateInstance();
171. String preMonday = df.format(monday);
172. return preMonday;
173. }
174.
175.
176. //获取当天时间
177. public String getNowTime(String dateformat){
178. Date now = new Date();
179. SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//可以方便地修改日期格式
180. String hehe = dateFormat.format(now);
181. return hehe;
182. }
183.
184. // 获得当前日期与本周日相差的天数
185. private int getMondayPlus() {
186. Calendar cd = Calendar.getInstance();
187. // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
188. int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK)-1; //因为按中国礼拜一作为第一天所以这里减1
189. if (dayOfWeek == 1) {
190. return 0;
191. } else {
192. return 1 - dayOfWeek;
193. }
194. }
195.
196. //获得本周一的日期
197. public String getMondayOFWeek(){
198. weeks = 0;
199. int mondayPlus = this.getMondayPlus();
200. GregorianCalendar currentDate = new GregorianCalendar();
201. currentDate.add(GregorianCalendar.DATE, mondayPlus);
202. Date monday = currentDate.getTime();
203.
204. DateFormat df = DateFormat.getDateInstance();
205. String preMonday = df.format(monday);
206. return preMonday;
207. }
208.
209. //获得相应周的周六的日期
210. public String getSaturday() {
211. int mondayPlus = this.getMondayPlus();
212. GregorianCalendar currentDate = new GregorianCalendar();
213. currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);
214. Date monday = currentDate.getTime();
215. DateFormat df = DateFormat.getDateInstance();
216. String preMonday = df.format(monday);
217. return preMonday;
218. }
219.
220. // 获得上周星期日的日期
221. public String getPreviousWeekSunday() {
222. weeks=0;
223. weeks--;
224. int mondayPlus = this.getMondayPlus();
225. GregorianCalendar currentDate = new GregorianCalendar();
226. currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks);
227. Date monday = currentDate.getTime();
228. DateFormat df = DateFormat.getDateInstance();
229. String preMonday = df.format(monday);
230. return preMonday;
231. }
232.
233. // 获得上周星期一的日期
234. public String getPreviousWeekday() {
235. weeks--;
236. int mondayPlus = this.getMondayPlus();
237. GregorianCalendar currentDate = new GregorianCalendar();
238. currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);
239. Date monday = currentDate.getTime();
240. DateFormat df = DateFormat.getDateInstance();
241. String preMonday = df.format(monday);
242. return preMonday;
243. }
244.
245. // 获得下周星期一的日期
246. public String getNextMonday() {
247. weeks++;
248. int mondayPlus = this.getMondayPlus();
249. GregorianCalendar currentDate = new GregorianCalendar();
250. currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);
251. Date monday = currentDate.getTime();
252. DateFormat df = DateFormat.getDateInstance();
253. String preMonday = df.format(monday);
254. return preMonday;
255. }
256.
257. // 获得下周星期日的日期
258. public String getNextSunday() {
259.
260. int mondayPlus = this.getMondayPlus();
261. GregorianCalendar currentDate = new GregorianCalendar();
262. currentDate.add(GregorianCalendar.DATE, mondayPlus + 7+6);
263. Date monday = currentDate.getTime();
264. DateFormat df = DateFormat.getDateInstance();
265. String preMonday = df.format(monday);
266. return preMonday;
267. }
268.
269.
270.
271. private int getMonthPlus(){
272. Calendar cd = Calendar.getInstance();
273. int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
274. cd.set(Calendar.DATE, 1);//把日期设置为当月第一天
275. cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
276. MaxDate=cd.get(Calendar.DATE);
277. if(monthOfNumber == 1){
278. return -MaxDate;
279. }else{
280. return 1-monthOfNumber;
281. }
282. }
283.
284. //获得上月最后一天的日期
285. public String getPreviousMonthEnd(){
286. String str = "";
287. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
288.
289. Calendar lastDate = Calendar.getInstance();
290. lastDate.add(Calendar.MONTH,-1);//减一个月
291. lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
292. lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天
293. str=sdf.format(lastDate.getTime());
294. return str;
295. }
296.
297. //获得下个月第一天的日期
298. public String getNextMonthFirst(){
299. String str = "";
300. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
301.
302. Calendar lastDate = Calendar.getInstance();
303. lastDate.add(Calendar.MONTH,1);//减一个月
304. lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
305. str=sdf.format(lastDate.getTime());
306. return str;
307. }
308.
309. //获得下个月最后一天的日期
310. public String getNextMonthEnd(){
311. String str = "";
312. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
313.
314. Calendar lastDate = Calendar.getInstance();
315. lastDate.add(Calendar.MONTH,1);//加一个月
316. lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
317. lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天
318. str=sdf.format(lastDate.getTime());
319. return str;
320. }
321.
322. //获得明年最后一天的日期
323. public String getNextYearEnd(){
324. String str = "";
325. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
326.
327. Calendar lastDate = Calendar.getInstance();
328. lastDate.add(Calendar.YEAR,1);//加一个年
329. lastDate.set(Calendar.DAY_OF_YEAR, 1);
330. lastDate.roll(Calendar.DAY_OF_YEAR, -1);
331. str=sdf.format(lastDate.getTime());
332. return str;
333. }
334.
335. //获得明年第一天的日期
336. public String getNextYearFirst(){
337. String str = "";
338. SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
339.
340. Calendar lastDate = Calendar.getInstance();
341. lastDate.add(Calendar.YEAR,1);//加一个年
342. lastDate.set(Calendar.DAY_OF_YEAR, 1);
343. str=sdf.format(lastDate.getTime());
344. return str;
345.
346. }
347.
348. //获得本年有多少天
349. private int getMaxYear(){
350. Calendar cd = Calendar.getInstance();
351. cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天
352. cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。
353. int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
354. return MaxYear;
355. }
356.
357. private int getYearPlus(){
358. Calendar cd = Calendar.getInstance();
359. int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天
360. cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天
361. cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。
362. int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
363. if(yearOfNumber == 1){
364. return -MaxYear;
365. }else{
366. return 1-yearOfNumber;
367. }
368. }
369. //获得本年第一天的日期
370. public String getCurrentYearFirst(){
371. int yearPlus = this.getYearPlus();
372. GregorianCalendar currentDate = new GregorianCalendar();
373. currentDate.add(GregorianCalendar.DATE,yearPlus);
374. Date yearDay = currentDate.getTime();
375. DateFormat df = DateFormat.getDateInstance();
376. String preYearDay = df.format(yearDay);
377. return preYearDay;
378. }
379.
380.
381. //获得本年最后一天的日期 *
382. public String getCurrentYearEnd(){
383. Date date = new Date();
384. SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
385. String years = dateFormat.format(date);
386. return years+"-12-31";
387. }
388.
389.
390. //获得上年第一天的日期 *
391. public String getPreviousYearFirst(){
392. Date date = new Date();
393. SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
394. String years = dateFormat.format(date); int years_value = Integer.parseInt(years);
395. years_value--;
396. return years_value+"-1-1";
397. }
398.
399. //获得上年最后一天的日期
400. public String getPreviousYearEnd(){
401. weeks--;
402. int yearPlus = this.getYearPlus();
403. GregorianCalendar currentDate = new GregorianCalendar();
404. currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1));
405. Date yearDay = currentDate.getTime();
406. DateFormat df = DateFormat.getDateInstance();
407. String preYearDay = df.format(yearDay);
408. getThisSeasonTime(11);
409. return preYearDay;
410. }
411.
412. //获得本季度
413. public String getThisSeasonTime(int month){
414. int array[][] = {{1,2,3},{4,5,6},{7,8,9},{10,11,12}};
415. int season = 1;
416. if(month>=1&&month<=3){
417. season = 1;
418. }
419. if(month>=4&&month<=6){
420. season = 2;
421. }
422. if(month>=7&&month<=9){
423. season = 3;
424. }
425. if(month>=10&&month<=12){
426. season = 4;
427. }
428. int start_month = array[season-1][0];
429. int end_month = array[season-1][2];
430.
431. Date date = new Date();
432. SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
433. String years = dateFormat.format(date);
434. int years_value = Integer.parseInt(years);
435.
436. int start_days =1;//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
437. int end_days = getLastDayOfMonth(years_value,end_month);
438. String seasonDate = years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days;
439. return seasonDate;
440.
441. }
442.
443. /**
444. * 获取某年某月的最后一天
445. * @param year 年
446. * @param month 月
447. * @return 最后一天
448. */
449. private int getLastDayOfMonth(int year, int month) {
450. if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
451. || month == 10 || month == 12) {
452. return 31;
453. }
454. if (month == 4 || month == 6 || month == 9 || month == 11) {
455. return 30;
456. }
457. if (month == 2) {
458. if (isLeapYear(year)) {
459. return 29;
460. } else {
461. return 28;
462. }
463. }
464. return 0;
465. }
466. /**
467. * 是否闰年
468. * @param year 年
469. * @return
470. */
471. public boolean isLeapYear(int year) {
472. return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
473. }
474. }
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