java新建日期获取工具

时间：2016-08-05 15:43:36 阅读：197 评论：0 收藏：0 [点我收藏+]

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  1 package com.hefeng.test;  
  2   
  3   
  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 }

这篇代码对我帮助很大,所有收藏希望能帮助更多的人

转自:http://www.iteye.com/topic/285405

package com.hefeng.test;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class TimeTest {
//用来全局控制上一周，本周，下一周的周数变化
private int weeks = 0;
private int MaxDate;//一月最大天数
private int MaxYear;//一年最大天数
/**
* @param args
*/
public static void main(String[] args) {
TimeTest tt = new TimeTest();
System.out.println("获取当天日期:"+tt.getNowTime("yyyy-MM-dd"));
System.out.println("获取本周一日期:"+tt.getMondayOFWeek());
System.out.println("获取本周日的日期~:"+tt.getCurrentWeekday());
System.out.println("获取上周一日期:"+tt.getPreviousWeekday());
System.out.println("获取上周日日期:"+tt.getPreviousWeekSunday());
System.out.println("获取下周一日期:"+tt.getNextMonday());
System.out.println("获取下周日日期:"+tt.getNextSunday());
System.out.println("获得相应周的周六的日期:"+tt.getNowTime("yyyy-MM-dd"));
System.out.println("获取本月第一天日期:"+tt.getFirstDayOfMonth());
System.out.println("获取本月最后一天日期:"+tt.getDefaultDay());
System.out.println("获取上月第一天日期:"+tt.getPreviousMonthFirst());
System.out.println("获取上月最后一天的日期:"+tt.getPreviousMonthEnd());
System.out.println("获取下月第一天日期:"+tt.getNextMonthFirst());
System.out.println("获取下月最后一天日期:"+tt.getNextMonthEnd());
System.out.println("获取本年的第一天日期:"+tt.getCurrentYearFirst());
System.out.println("获取本年最后一天日期:"+tt.getCurrentYearEnd());
System.out.println("获取去年的第一天日期:"+tt.getPreviousYearFirst());
System.out.println("获取去年的最后一天日期:"+tt.getPreviousYearEnd());
System.out.println("获取明年第一天日期:"+tt.getNextYearFirst());
System.out.println("获取明年最后一天日期:"+tt.getNextYearEnd());
System.out.println("获取本季度第一天到最后一天:"+tt.getThisSeasonTime(11));
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"));
}
/**
* 得到二个日期间的间隔天数
*/
public static String getTwoDay(String sj1, String sj2) {
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
long day = 0;
try {
java.util.Date date = myFormatter.parse(sj1);
java.util.Date mydate = myFormatter.parse(sj2);
day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
return "";
}
return day + "";
}
/**
* 根据一个日期，返回是星期几的字符串
*
* @param sdate
* @return
*/
public static String getWeek(String sdate) {
// 再转换为时间
Date date = TimeTest.strToDate(sdate);
Calendar c = Calendar.getInstance();
c.setTime(date);
// int hour=c.get(Calendar.DAY_OF_WEEK);
// hour中存的就是星期几了，其范围 1~7
// 1=星期日 7=星期六，其他类推
return new SimpleDateFormat("EEEE").format(c.getTime());
}
/**
* 将短时间格式字符串转换为时间 yyyy-MM-dd
*
* @param strDate
* @return
*/
public static Date strToDate(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
/**
* 两个时间之间的天数
*
* @param date1
* @param date2
* @return
*/
public static long getDays(String date1, String date2) {
if (date1 == null || date1.equals(""))
return 0;
if (date2 == null || date2.equals(""))
return 0;
// 转换为标准时间
SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date = null;
java.util.Date mydate = null;
try {
date = myFormatter.parse(date1);
mydate = myFormatter.parse(date2);
} catch (Exception e) {
}
long day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
return day;
}
// 计算当月最后一天,返回字符串
public String getDefaultDay(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1);//设为当前月的1号
lastDate.add(Calendar.MONTH,1);//加一个月，变为下月的1号
lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
// 上月第一天
public String getPreviousMonthFirst(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1);//设为当前月的1号
lastDate.add(Calendar.MONTH,-1);//减一个月，变为下月的1号
//lastDate.add(Calendar.DATE,-1);//减去一天，变为当月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
//获取当月第一天
public String getFirstDayOfMonth(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.set(Calendar.DATE,1);//设为当前月的1号
str=sdf.format(lastDate.getTime());
return str;
}
// 获得本周星期日的日期
public String getCurrentWeekday() {
weeks = 0;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus+6);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
//获取当天时间
public String getNowTime(String dateformat){
Date now = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat(dateformat);//可以方便地修改日期格式
String hehe = dateFormat.format(now);
return hehe;
}
// 获得当前日期与本周日相差的天数
private int getMondayPlus() {
Calendar cd = Calendar.getInstance();
// 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......
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
if (dayOfWeek == 1) {
return 0;
} else {
return 1 - dayOfWeek;
}
}
//获得本周一的日期
public String getMondayOFWeek(){
weeks = 0;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
//获得相应周的周六的日期
public String getSaturday() {
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks + 6);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得上周星期日的日期
public String getPreviousWeekSunday() {
weeks=0;
weeks--;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus+weeks);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得上周星期一的日期
public String getPreviousWeekday() {
weeks--;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7 * weeks);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得下周星期一的日期
public String getNextMonday() {
weeks++;
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
// 获得下周星期日的日期
public String getNextSunday() {
int mondayPlus = this.getMondayPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE, mondayPlus + 7+6);
Date monday = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preMonday = df.format(monday);
return preMonday;
}
private int getMonthPlus(){
Calendar cd = Calendar.getInstance();
int monthOfNumber = cd.get(Calendar.DAY_OF_MONTH);
cd.set(Calendar.DATE, 1);//把日期设置为当月第一天
cd.roll(Calendar.DATE, -1);//日期回滚一天，也就是最后一天
MaxDate=cd.get(Calendar.DATE);
if(monthOfNumber == 1){
return -MaxDate;
}else{
return 1-monthOfNumber;
}
}
//获得上月最后一天的日期
public String getPreviousMonthEnd(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH,-1);//减一个月
lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
//获得下个月第一天的日期
public String getNextMonthFirst(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH,1);//减一个月
lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
str=sdf.format(lastDate.getTime());
return str;
}
//获得下个月最后一天的日期
public String getNextMonthEnd(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.MONTH,1);//加一个月
lastDate.set(Calendar.DATE, 1);//把日期设置为当月第一天
lastDate.roll(Calendar.DATE, -1);//日期回滚一天，也就是本月最后一天
str=sdf.format(lastDate.getTime());
return str;
}
//获得明年最后一天的日期
public String getNextYearEnd(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR,1);//加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1);
lastDate.roll(Calendar.DAY_OF_YEAR, -1);
str=sdf.format(lastDate.getTime());
return str;
}
//获得明年第一天的日期
public String getNextYearFirst(){
String str = "";
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar lastDate = Calendar.getInstance();
lastDate.add(Calendar.YEAR,1);//加一个年
lastDate.set(Calendar.DAY_OF_YEAR, 1);
str=sdf.format(lastDate.getTime());
return str;
}
//获得本年有多少天
private int getMaxYear(){
Calendar cd = Calendar.getInstance();
cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天
cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
return MaxYear;
}
private int getYearPlus(){
Calendar cd = Calendar.getInstance();
int yearOfNumber = cd.get(Calendar.DAY_OF_YEAR);//获得当天是一年中的第几天
cd.set(Calendar.DAY_OF_YEAR,1);//把日期设为当年第一天
cd.roll(Calendar.DAY_OF_YEAR,-1);//把日期回滚一天。
int MaxYear = cd.get(Calendar.DAY_OF_YEAR);
if(yearOfNumber == 1){
return -MaxYear;
}else{
return 1-yearOfNumber;
}
}
//获得本年第一天的日期
public String getCurrentYearFirst(){
int yearPlus = this.getYearPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,yearPlus);
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay = df.format(yearDay);
return preYearDay;
}
//获得本年最后一天的日期 *
public String getCurrentYearEnd(){
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
String years = dateFormat.format(date);
return years+"-12-31";
}
//获得上年第一天的日期 *
public String getPreviousYearFirst(){
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
String years = dateFormat.format(date); int years_value = Integer.parseInt(years);
years_value--;
return years_value+"-1-1";
}
//获得上年最后一天的日期
public String getPreviousYearEnd(){
weeks--;
int yearPlus = this.getYearPlus();
GregorianCalendar currentDate = new GregorianCalendar();
currentDate.add(GregorianCalendar.DATE,yearPlus+MaxYear*weeks+(MaxYear-1));
Date yearDay = currentDate.getTime();
DateFormat df = DateFormat.getDateInstance();
String preYearDay = df.format(yearDay);
getThisSeasonTime(11);
return preYearDay;
}
//获得本季度
public String getThisSeasonTime(int month){
int array[][] = {{1,2,3},{4,5,6},{7,8,9},{10,11,12}};
int season = 1;
if(month>=1&&month<=3){
season = 1;
}
if(month>=4&&month<=6){
season = 2;
}
if(month>=7&&month<=9){
season = 3;
}
if(month>=10&&month<=12){
season = 4;
}
int start_month = array[season-1][0];
int end_month = array[season-1][2];
Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");//可以方便地修改日期格式
String years = dateFormat.format(date);
int years_value = Integer.parseInt(years);
int start_days =1;//years+"-"+String.valueOf(start_month)+"-1";//getLastDayOfMonth(years_value,start_month);
int end_days = getLastDayOfMonth(years_value,end_month);
String seasonDate = years_value+"-"+start_month+"-"+start_days+";"+years_value+"-"+end_month+"-"+end_days;
return seasonDate;
}
/**
* 获取某年某月的最后一天
* @param year 年
* @param month 月
* @return 最后一天
*/
private int getLastDayOfMonth(int year, int month) {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8
|| month == 10 || month == 12) {
return 31;
}
if (month == 4 || month == 6 || month == 9 || month == 11) {
return 30;
}
if (month == 2) {
if (isLeapYear(year)) {
return 29;
} else {
return 28;
}
}
return 0;
}
/**
* 是否闰年
* @param year 年
* @return
*/
public boolean isLeapYear(int year) {
return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}
}

java新建日期获取工具

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原文地址：http://www.cnblogs.com/wangshuai-1129/p/5741053.html

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