zoukankan html css js c++ java
Android 开发笔记___DateUtil——Time

  1 package com.example.alimjan.hello_world;
  2 
  3 /**
  4  * Created by alimjan on 6/30/2017.
  5  */
  6 
  7         import java.text.ParseException;
  8         import java.text.SimpleDateFormat;
  9         import java.util.Calendar;
 10         import java.util.Date;
 11 
 12 
 13 public class DateUtil {
 14 
 15     private static final String FORMAT = "yyyy-MM-dd HH:mm:ss";
 16 
 17     public static Date str2Date(String str) {
 18         return str2Date(str, null);
 19     }
 20 
 21     public static Date str2Date(String str, String format) {
 22         if (str == null || str.length() == 0) {
 23             return null;
 24         }
 25         if (format == null || format.length() == 0) {
 26             format = FORMAT;
 27         }
 28         Date date = null;
 29         try {
 30             SimpleDateFormat sdf = new SimpleDateFormat(format);
 31             date = sdf.parse(str);
 32 
 33         } catch (Exception e) {
 34             e.printStackTrace();
 35         }
 36         return date;
 37 
 38     }
 39 
 40     public static Calendar str2Calendar(String str) {
 41         return str2Calendar(str, null);
 42 
 43     }
 44 
 45     public static Calendar str2Calendar(String str, String format) {
 46 
 47         Date date = str2Date(str, format);
 48         if (date == null) {
 49             return null;
 50         }
 51         Calendar c = Calendar.getInstance();
 52         c.setTime(date);
 53 
 54         return c;
 55 
 56     }
 57 
 58     public static String date2Str(Calendar c) {// yyyy-MM-dd HH:mm:ss
 59         return date2Str(c, null);
 60     }
 61 
 62     public static String date2Str(Calendar c, String format) {
 63         if (c == null) {
 64             return null;
 65         }
 66         return date2Str(c.getTime(), format);
 67     }
 68 
 69     public static String date2Str(Date d) {// yyyy-MM-dd HH:mm:ss
 70         return date2Str(d, null);
 71     }
 72 
 73     public static String date2Str(Date d, String format) {// yyyy-MM-dd HH:mm:ss
 74         if (d == null) {
 75             return null;
 76         }
 77         if (format == null || format.length() == 0) {
 78             format = FORMAT;
 79         }
 80         SimpleDateFormat sdf = new SimpleDateFormat(format);
 81         String s = sdf.format(d);
 82         return s;
 83     }
 84 
 85     public static String getCurDateStr() {
 86         Calendar c = Calendar.getInstance();
 87         c.setTime(new Date());
 88         return c.get(Calendar.YEAR) + "-" + (c.get(Calendar.MONTH) + 1) + "-"
 89                 + c.get(Calendar.DAY_OF_MONTH) + "-"
 90                 + c.get(Calendar.HOUR_OF_DAY) + ":" + c.get(Calendar.MINUTE)
 91                 + ":" + c.get(Calendar.SECOND);
 92     }
 93 
 94     /**
 95      * 获得当前日期的字符串格式
 96      *
 97      * @param format
 98      * @return
 99      */
100     public static String getCurDateStr(String format) {
101         Calendar c = Calendar.getInstance();
102         return date2Str(c, format);
103     }
104 
105     // 格式到秒
106     public static String getMillon(long time) {
107 
108         return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(time);
109 
110     }
111 
112     // 格式到天
113     public static String getDay(long time) {
114 
115         return new SimpleDateFormat("yyyy-MM-dd").format(time);
116 
117     }
118 
119     // 格式到毫秒
120     public static String getSMillon(long time) {
121 
122         return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS").format(time);
123 
124     }
125 
126 
127     /*
128      输入的是String，格式诸如20120102，实现加一天的功能，返回的格式为String，诸如20120103
129      */
130     public static String stringDatePlus(String row) throws ParseException{
131         String year=row.substring(0, 4);
132         String month=row.substring(4,6);
133         String day=row.substring(6);
134         String date1=year+"-"+month+"-"+day;
135         SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
136         Date startDate=sdf.parse(date1);
137         Calendar cd = Calendar.getInstance();
138         cd.setTime(startDate);
139         cd.add(Calendar.DATE, 1);
140         String dateStr =sdf.format(cd.getTime());
141         String year1=dateStr.substring(0,4);
142         String month1=dateStr.substring(5,7);
143         String day1=dateStr.substring(8);
144         return year1+month1+day1;
145     }
146 
147     /*
148      输入的是String，格式诸如20120102，实现减一天的功能，返回的格式为String，诸如20120101
149      */
150     public static String stringDateDecrease(String row) throws ParseException{
151         String year=row.substring(0, 4);
152         String month=row.substring(4,6);
153         String day=row.substring(6);
154         String date1=year+"-"+month+"-"+day;
155         SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
156         Date startDate=sdf.parse(date1);
157         Calendar cd = Calendar.getInstance();
158         cd.setTime(startDate);
159         cd.add(Calendar.DATE, -1);
160         String dateStr =sdf.format(cd.getTime());
161         String year1=dateStr.substring(0,4);
162         String month1=dateStr.substring(5,7);
163         String day1=dateStr.substring(8);
164         return year1+month1+day1;
165     }
166 
167     /*
168      输入的格式为String，诸如20120101，返回的格式为String，诸如2012-01-01
169      */
170     public static String stringDateChange(String date)
171     {
172         if(date.length()=="20120101".length()){
173             String year=date.substring(0, 4);
174             String month=date.substring(4,6);
175             String day=date.substring(6);
176             return year+"-"+month+"-"+day;
177         }else{
178             return date;
179         }
180 
181 
182     }
183     /**
184      * 日期向后推一天
185      * @param date 格式：20120101
186      * @return  20120102
187      */
188     public static String tonextday(String date){
189         int year = Integer.parseInt(date.substring(0,4));
190         int month = Integer.parseInt(date.substring(4,6));
191         int day = Integer.parseInt(date.substring(6));
192         Calendar calendar = Calendar.getInstance();
193         calendar.set(year, month-1, day+1);
194         Date newdate = calendar.getTime();
195         SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
196         String da = format.format(newdate);
197         return da;
198     }
199 
200     /**
201      * 获取当前日期上一周的开始日期 （周日）
202      */
203     public static String previousWeekByDate(String date) {
204         int year = Integer.parseInt(date.substring(0,4));
205         int month = Integer.parseInt(date.substring(4,6));
206         int day = Integer.parseInt(date.substring(6));
207         Calendar calendar = Calendar.getInstance();
208         calendar.set(year, month-1, day);
209         Date newdate = calendar.getTime();
210         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
211         Calendar cal = Calendar.getInstance();
212         cal.setTime(newdate);
213         int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
214         if(1 == dayWeek) {
215             cal.add(Calendar.DAY_OF_MONTH, -1);
216         }
217         cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
218         int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
219         cal.add(Calendar.DATE, cal.getFirstDayOfWeek()-s);//根据日历的规则，给当前日期减往星期几与一个星期第一天的差值
220         cal.add(Calendar.WEEK_OF_YEAR, -1);
221         String imptimeBegin = sdf.format(cal.getTime());
222 //      System.out.println("所在周星期日的日期："+imptimeBegin);
223         return imptimeBegin;
224     }
225 
226 
227     /**
228      * 获取当前日期上一周的结束日期 （周六）
229      */
230     public static String previousWeekEndDayByDate(String date) {
231         int year = Integer.parseInt(date.substring(0,4));
232         int month = Integer.parseInt(date.substring(4,6));
233         int day = Integer.parseInt(date.substring(6));
234         Calendar calendar = Calendar.getInstance();
235         calendar.set(year, month-1, day);
236         Date newdate = calendar.getTime();
237         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
238         Calendar cal = Calendar.getInstance();
239         cal.setTime(newdate);
240         int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
241         if(1 == dayWeek) {
242             cal.add(Calendar.DAY_OF_MONTH, -1);
243         }
244         cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
245         int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
246         cal.add(Calendar.DATE, cal.getFirstDayOfWeek()+(6-s));
247         cal.add(Calendar.WEEK_OF_YEAR, -1);
248         String imptimeBegin = sdf.format(cal.getTime());
249 //      System.out.println("星期六的日期："+imptimeBegin);
250         return imptimeBegin;
251     }
252 
253 
254     /**
255      * 获取当前日期当前一周的开始日期 （周日）
256      */
257     public static String getCurrentWeekFirstDayByDate(String date) {
258         int year = Integer.parseInt(date.substring(0,4));
259         int month = Integer.parseInt(date.substring(4,6));
260         int day = Integer.parseInt(date.substring(6));
261         Calendar calendar = Calendar.getInstance();
262         calendar.set(year, month-1, day);
263         Date newdate = calendar.getTime();
264         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
265         Calendar cal = Calendar.getInstance();
266         cal.setTime(newdate);
267         int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
268         if(1 == dayWeek) {
269             cal.add(Calendar.DAY_OF_MONTH, -1);
270         }
271         cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
272         int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
273         cal.add(Calendar.DATE, cal.getFirstDayOfWeek()-s);//根据日历的规则，给当前日期减往星期几与一个星期第一天的差值
274 
275         String imptimeBegin = sdf.format(cal.getTime());
276         //  System.out.println("所在周星期日的日期："+imptimeBegin);
277         return imptimeBegin;
278     }
279     /**
280      * 获取当前日期当前一周的结束日期 （周六）
281      */
282     public static String getCurrentWeekEndDayByDate(String date) {
283         int year = Integer.parseInt(date.substring(0,4));
284         int month = Integer.parseInt(date.substring(4,6));
285         int day = Integer.parseInt(date.substring(6));
286         Calendar calendar = Calendar.getInstance();
287         calendar.set(year, month-1, day);
288         Date newdate = calendar.getTime();
289         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
290         Calendar cal = Calendar.getInstance();
291         cal.setTime(newdate);
292         int dayWeek = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
293         if(1 == dayWeek) {
294             cal.add(Calendar.DAY_OF_MONTH, -1);
295         }
296         cal.setFirstDayOfWeek(Calendar.SUNDAY);//设置一个星期的第一天，按中国的习惯一个星期的第一天是星期一
297         int s = cal.get(Calendar.DAY_OF_WEEK);//获得当前日期是一个星期的第几天
298         cal.add(Calendar.DATE, cal.getFirstDayOfWeek()+(6-s));
299 
300         String imptimeBegin = sdf.format(cal.getTime());
301         return imptimeBegin;
302     }
303 
304 
305     /**
306      * 返回上一个月的第一天
307      * @param date20120304
308      * @return  20120201
309      */
310     public static String previousMonthByDate(String date) {
311         // TODO Auto-generated method stub
312         int year = Integer.parseInt(date.substring(0,4));
313         int month = Integer.parseInt(date.substring(4,6));
314         int day = Integer.parseInt(date.substring(6));
315         Calendar calendar = Calendar.getInstance();
316         calendar.set(year, month-2, 1);
317         Date newdate = calendar.getTime();
318         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
319         Calendar cal = Calendar.getInstance();
320         cal.setTime(newdate);
321         String imptimeBegin = sdf.format(cal.getTime());
322 //      System.out.println(imptimeBegin);
323         return imptimeBegin;
324     }
325 
326     /**
327      * 返回下一个月的第一天
328      * @param date20120304
329      * @return  20120401
330      */
331     public static String nextMonthByDate(String date) {
332         // TODO Auto-generated method stub
333         int year = Integer.parseInt(date.substring(0,4));
334         int month = Integer.parseInt(date.substring(4,6));
335         int day = Integer.parseInt(date.substring(6));
336         Calendar calendar = Calendar.getInstance();
337         calendar.set(year, month, 1);
338         Date newdate = calendar.getTime();
339         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
340         Calendar cal = Calendar.getInstance();
341         cal.setTime(newdate);
342         String imptimeBegin = sdf.format(cal.getTime());
343 //      System.out.println(imptimeBegin);
344         return imptimeBegin;
345     }
346     /**
347      * 返回当前月的第一天
348      * @param date20120103
349      * @return 20120101
350      */
351     public static String getCurrentMonthFirstDayByDate(String date) {
352         int year = Integer.parseInt(date.substring(0,4));
353         int month = Integer.parseInt(date.substring(4,6));
354         int day = Integer.parseInt(date.substring(6));
355         Calendar calendar = Calendar.getInstance();
356         calendar.set(year, month-1, 1);
357         Date newdate = calendar.getTime();
358         SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd");
359         Calendar cal = Calendar.getInstance();
360         cal.setTime(newdate);
361         String imptimeBegin = sdf.format(cal.getTime());
362         return imptimeBegin;
363     }
364 
365 }
查看全文
相关阅读:
linux下查看机器是cpu是几核
 Stylus 安装使用图解
 npm 安装配置
 vue-cli vue脚手架
 nodejs与npm
超详细解决 PLSQL下拉数据库"空白"
Oracle 11g Windows64位
 Mysql 5.7.x zip windows安装
 Windows下Nginx的启动、停止、重启等命令
 Swagger中最常用的几个注解
原文地址：https://www.cnblogs.com/alimjan/p/7102186.html