Java时间操作

Posted 2021-02-09 21karat

Java对时间的相关转换操作

  1 package com.aone.foottalk.common;
  2 
  3 import java.text.ParsePosition;
  4 import java.text.SimpleDateFormat;
  5 import java.util.Calendar;
  6 import java.util.Date;
  7 import java.util.Locale;
  8 
  9 public class Demo {
 10     /**
 11      * 获取系统时间Date
 12      * @return
 13      */
 14     public static Date systemtime() {
 15         Date date = new Date();
 16         SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.CHINA);
 17         String dateString = formatter.format(date);
 18         ParsePosition pos = new ParsePosition(0);
 19         Date currenttime = formatter.parse(dateString, pos);
 20         return currenttime;
 21     }
 22     /**
 23      * 获取系统时间long
 24      * @return
 25      */
 26     public static long systemtimeLong() {
 27         return new Date().getTime();
 28     }
 29     /**
 30      * 获得当天零时零分零秒
 31      * @return
 32      */
 33     public static Date initDateByDay(){
 34         Calendar calendar = Calendar.getInstance();
 35         calendar.setTime(new Date());
 36         calendar.set(Calendar.HOUR, 0);
 37         calendar.set(Calendar.MINUTE, 0);
 38         calendar.set(Calendar.SECOND, 0);
 39         return calendar.getTime();
 40     }
 41     /**
 42      * 转换数据库日期格式
 43      * @param object
 44      * @return
 45      */
 46     public static String formateDbDate(Date object) {
 47         SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.CHINA);
 48         String dateString = formatter.format(object);
 49         return dateString;
 50     }
 51     /**
 52      * 转换数据库long型日期至字符串类型
 53      * @param millsec
 54      * @return
 55      */
 56     public static String formateMillsecDateToStr(long millsec){
 57         SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss",Locale.CHINA);
 58         Date date= new Date(millsec);
 59         return formatter.format(date);
 60     }
 61     /**
 62      * 获取week
 63      * @param date
 64      * @return
 65      */
 66     public static String getWeek(Date date) {
 67         String[] weeks = { "周日", "周一", "周二", "周三", "周四", "周五", "周六" };
 68         Calendar cal = Calendar.getInstance();
 69         cal.setTime(date);
 70         int week_index = cal.get(Calendar.DAY_OF_WEEK) - 1;
 71         if (week_index < 0) {
 72             week_index = 0;
 73         }
 74         return weeks[week_index];
 75     }
 76     /**
 77      * 查询当前时间N个小时后的时间
 78      * @return
 79      */
 80     public static String getCurrentTimeAfterNTime(long time, int n) {
 81         Calendar dar = Calendar.getInstance();
 82         SimpleDateFormat dft = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 83         dar.setTimeInMillis(time);
 84         dar.add(Calendar.HOUR_OF_DAY, n);
 85         return dft.format(dar.getTime());
 86     }
 87     /**
 88      * 查询当前时间n秒后的时间
 89      * @param n
 90      * @return
 91      */
 92     public static long getCurrentTimeAfterNTime(long n) {
 93         long currentTime = System.currentTimeMillis() ;
 94         currentTime += n*1000;
 95         return currentTime;
 96     }
 97     /**
 98      *  获取昨天/明天的时间
 99      * @param type 1:昨天  2:明天
100      * @return
101      */
102     public static String getYesTomDayDate(int type) {
103         Calendar cal = Calendar.getInstance();
104         if (type == 1){
105             cal.add(Calendar.DATE, -1);
106         }else if (type == 2){
107             cal.add(Calendar.DATE, 1);
108         }
109         SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
110         String time = formatter.format(cal.getTime()).toString();
111         return time;
112     }
113     /**
114      * 当前系统n秒前的时间(n随机)
115      * @param n
116      * @return
117      */
118     public static String getCurrentTimeBeforTime() {
119         int ms=(int)(1+Math.random()*(60-1+1));
120         SimpleDateFormat fd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
121         Calendar calendar = Calendar.getInstance();//此时打印它获取的是系统当前时间
122         calendar.add(Calendar.SECOND, -ms);//当前系统时间 的  前10 秒的时间
123         String tensecondago = fd.format(calendar.getTime());
124         return tensecondago;
125     }
126     /**
127      * 获取当前时间前3分钟
128      * @return
129      */
130     public static String getCurrentTime(){
131         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");   
132         Calendar beforeTime = Calendar.getInstance();   
133         beforeTime.add(Calendar.MINUTE, -2);
134         // 3分钟之前的时间   
135         Date beforeD = beforeTime.getTime();   
136         String time = sdf.format(beforeD);
137         return time; 
138     }
139     /**
140      * 判断选择的日期是否是本周 (当前周)  
141      * @param time
142      * @return
143      */
144     public static boolean isThisWeek(long time){  
145         Calendar calendar = Calendar.getInstance();  
146         int currentWeek = calendar.get(Calendar.WEEK_OF_YEAR);  
147         calendar.setTime(new Date(time));  
148         int paramWeek = calendar.get(Calendar.WEEK_OF_YEAR);  
149         if(paramWeek==currentWeek){  
150            return true;  
151         }  
152         return false;  
153     }
154     /**
155      * 获取本周的开始时间
156      * @return
157      */
158     @SuppressWarnings("unused")
159     public static Date getBeginDayOfWeek() {
160         Date date = new Date();
161         if (date == null) {
162             return null;
163         }
164         Calendar cal = Calendar.getInstance();
165         cal.setTime(date);
166         int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
167         if (dayofweek == 1) {
168                 dayofweek += 7;
169         }
170         cal.add(Calendar.DATE, 2 - dayofweek);
171         return cal.getTime();
172     }
173     /**
174      * 获取本周的结束时间
175      * @return
176      */
177     public static Date getEndDayOfWeek(){
178         Calendar cal = Calendar.getInstance();
179         cal.setTime(getBeginDayOfWeek());  
180         cal.add(Calendar.DAY_OF_WEEK, 6); 
181         Date weekEndSta = cal.getTime();
182         return weekEndSta;
183     }
184     /**
185      * 获得本周日24点时间    
186      * @return
187      */
188     public  static Date getTimesWeeknight() {  
189         Calendar cal = Calendar.getInstance();  
190         cal.setTime(getTimesWeekmorning());  
191         cal.add(Calendar.DAY_OF_WEEK, 7);  
192         return cal.getTime();  
193     }  
194 
195     /**
196      * 获得本周一0点时间   
197      * @return
198      */
199     public static Date getTimesWeekmorning() {  
200         Calendar cal = Calendar.getInstance();  
201         cal.set(cal.get(Calendar.YEAR), cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0, 0);  
202         cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);  
203         return  cal.getTime();  
204     }
205 }