日期的简单封装

  1 import java.text.DateFormat;
  2 import java.text.ParseException;
  3 import java.text.SimpleDateFormat;
  4 import java.util.Calendar;
  5 import java.util.Date;
  6 
  7 import org.apache.commons.lang.StringUtils;
  8 
  9 public class DateUtil {
 10 
 11     public static long daysDiff(Date firstDay, Date lastDay) {
 12         if (firstDay == null || lastDay == null) {
 13             return 0;
 14         }
 15         long allDays = (lastDay.getTime() - (firstDay.getTime()))
 16                 / (1000 * 24 * 60 * 60);
 17 
 18         return allDays;
 19     }
 20 
 21     public static Long yearDiff(Date firstDay, Date lastDay) {
 22         if (firstDay == null || lastDay == null)
 23             return null;
 24         Calendar first = Calendar.getInstance();
 25         first.setTime(firstDay);
 26         Calendar last = Calendar.getInstance();
 27         last.setTime(lastDay);
 28         long years = last.get(Calendar.YEAR) - first.get(Calendar.YEAR);
 29         return years;
 30     }
 31 
 32     public static Date addMinute(Date src, int minute) {
 33         Calendar c = Calendar.getInstance();
 34         c.setTime(src);
 35         c.add(Calendar.MINUTE, minute);
 36         return c.getTime();
 37     }
 38 
 39     public static String getTodayTextYMD() {
 40         DateFormat df = new SimpleDateFormat("yyyyMMdd");
 41         return df.format(new Date());
 42 
 43     }
 44 
 45     public static String getYesterdayTextYMD() {
 46         Calendar c = Calendar.getInstance();
 47         c.add(Calendar.DAY_OF_YEAR, -1);
 48         DateFormat df = new SimpleDateFormat("yyyyMMdd");
 49         return df.format(c.getTime());
 50 
 51     }
 52 
 53     public static Date getYesterday() {
 54         Calendar c = Calendar.getInstance();
 55         c.add(Calendar.DAY_OF_YEAR, -1);
 56         return c.getTime();
 57     }
 58 
 59     public static Date parseDateYMD(String ymd) {
 60         DateFormat df = new SimpleDateFormat("yyyyMMdd");
 61         try {
 62             return df.parse(ymd);
 63         } catch (ParseException e) {
 64             return getYesterday();
 65         }
 66     }
 67     
 68     public static Date parseDate(String strDate,String dateFormat) {
 69         DateFormat df = new SimpleDateFormat(dateFormat);
 70         try {
 71             return df.parse(strDate);
 72         } catch (ParseException e) {
 73             return null;
 74         }
 75     }
 76     
 77     /**
 78      * 将传入的日期以指定格式转成字符串
 79      * 
 80      * @param format
 81      * @param dt
 82      * @return
 83      */
 84     public static String formatDate(String format, Date dt) {
 85         if (dt == null) {
 86             return "";
 87         }
 88         if(StringUtils.isBlank(format)){
 89             return "";
 90         }
 91         
 92         SimpleDateFormat fmt = new SimpleDateFormat(format);
 93         return fmt.format(dt);
 94     }
 95     
 96     public static String getToday(){
 97         SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
 98         return df.format(new Date());
 99     }
100     
101     /**
102      * 获取给定日期的最后一天
103      * @param dateStr
104      * @return
105      * @throws ParseException
106      */
107     public static Date getLastDayOfMonth(Date date) throws ParseException{
108         if(date!=null){
109             Calendar calendar = Calendar.getInstance();
110             calendar.setTime(date);
111             calendar.add(Calendar.MONTH, 1);
112             calendar.set(Calendar.DAY_OF_MONTH,1);
113             calendar.add(Calendar.DAY_OF_MONTH,-1);
114             return calendar.getTime();
115         }else{
116             throw new IllegalArgumentException("The parameter dateStr not be specified!");
117         }
118     }
119     
120     public static int getDayOfWeek(Calendar calendar) {
121         int today;
122         if (calendar != null) {
123             today = calendar.get(7);
124         } else {
125             today = Calendar.getInstance().get(7);
126         }
127         if (today == 1) {
128             return 7;
129         }
130         return today - 1;
131     }
132     
133     public static int getDayOfWeek(Date date) {
134         if (date == null) {
135             date = new Date();
136         }
137 
138         Calendar cal = Calendar.getInstance();
139         cal.setTime(date);
140         return getDayOfWeek(cal);
141     }
142 }
  1 import java.util.Calendar;
  2 import java.util.Date;
  3 
  4 public class DateUtils {
  5 
  6     /** 源日期格式 */
  7     private static final String SOURCE_DATE_PATTERN = "yyyy-MM-dd'T'HH:mm:ss";
  8     
  9     /** 目标日期格式 */
 10     private static final String TARGET_DATE_PATTERN = "yyyy-MM-dd HH:mm:ss";
 11     
 12     private static final String TARGET_DATE_PATTERN_01 = "yyyyMMdd";
 13     
 14     private static final String TARGET_DATE_PATTERN_02 = "yyyy-MM-dd";
 15     
 16     /**
 17      * 字符日期转Date
 18      * yyyy-MM-dd'T'HH:mm:ss
 19      *        |  源日期格式
 20      * @param scheduleDate
 21      * @return
 22      */
 23     public static Date convertDate(String scheduleDate){
 24         return DateUtil.parseDate(scheduleDate, SOURCE_DATE_PATTERN);
 25     }
 26     
 27     /**
 28      * 字符日期格式转换
 29      *  yyyy-MM-dd'T'HH:mm:ss
 30      *        |  源日期格式
 31      *  yyyy-MM-dd HH:mm:ss
 32      *        |  目标日期格式
 33      * @param scheduleDate
 34      * @return
 35      */
 36     public static String convertDate2Str(String scheduleDate){
 37         return convertDate2Str(scheduleDate, SOURCE_DATE_PATTERN, TARGET_DATE_PATTERN);
 38     }
 39     
 40     /**
 41      * 字符日期格式转换
 42      *  yyyy-MM-dd'T'HH:mm:ss
 43      *        |  源日期格式
 44      *  yyyyMMdd
 45      *        |  目标日期格式
 46      * @param scheduleDate
 47      * @return
 48      */
 49     public static String convertDate2Str01(String scheduleDate){
 50         return convertDate2Str(scheduleDate, SOURCE_DATE_PATTERN, TARGET_DATE_PATTERN_01);
 51     }
 52     /**
 53      * 字符日期格式转换
 54      *  yyyy-MM-dd'T'HH:mm:ss
 55      *        |  源日期格式
 56      *  yyyy-MM-dd
 57      *        |  目标日期格式
 58      * @param scheduleDate
 59      * @return
 60      */
 61     public static String convertDate2Str02(String scheduleDate){
 62         return convertDate2Str(scheduleDate, SOURCE_DATE_PATTERN, TARGET_DATE_PATTERN_02);
 63     }
 64     
 65     /**
 66      * 字符日期格式转换
 67      *  yyyy-MM-dd'T'HH:mm:ss
 68      *        |  源日期格式
 69      * @param scheduleDate
 70      * @param targetPattern  |  目标日期格式
 71      * @return
 72      */
 73     public static String convertDate2Str(String scheduleDate, String targetPattern){
 74         return convertDate2Str(scheduleDate, SOURCE_DATE_PATTERN, targetPattern);
 75     }
 76     
 77     /**
 78      * 字符日期格式转换
 79      * @param scheduleDate
 80      * @param sourcePattern  |  源日期格式
 81      * @param targetPattern  |  目标日期格式
 82      * @return
 83      */
 84     public static String convertDate2Str(String scheduleDate, String sourcePattern, String targetPattern){
 85         Date date = DateUtil.parseDate(scheduleDate, sourcePattern);
 86         return DateUtil.formatDate(targetPattern, date);
 87     }
 88     public static Date getYesterday() {
 89         Calendar c = Calendar.getInstance();
 90         c.add(Calendar.DAY_OF_YEAR, -1);
 91         return c.getTime();
 92     }
 93     
 94     /**
 95      * 
 96      * <p>
 97      * Sunday = 1
 98      * </p>
 99      * <p>
100      * Monday = 2
101      * </p>
102      * <p>
103      * Tuesday = 3
104      * </p>
105      * <p>
106      * Wednesday = 4
107      * </p>
108      * <p>
109      * Thursday = 5
110      * </p>
111      * <p>
112      * Friday = 6
113      * </p>
114      * <p>
115      * Saturday = 7
116      * </p>
117      * 
118      * @param date
119      * @return
120      */
121     public static int dayForWeek(Date date) {
122         Calendar c = Calendar.getInstance();
123         c.setTime(date);
124         int weekday = c.get(Calendar.DAY_OF_WEEK);
125         return weekday;
126     }
127     
128     public static boolean isSunday(Date date) {
129         return (1 == dayForWeek(date));
130     }
131     
132     public static boolean isSaturday(Date date) {
133         return (7 == dayForWeek(date));
134     }
135 }
  1 import java.text.ParseException;
  2 import java.text.SimpleDateFormat;
  3 import java.util.Calendar;
  4 import java.util.Date;
  5 
  6 import org.apache.commons.lang.StringUtils;
  7 
  8 public class IDateUtil {
  9     private static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
 10     private static SimpleDateFormat sdf0 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 11     private static SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
 12     
 13     public static String parseDateString(String s){
 14         if(s==null||"".equals(s)){
 15             return null;
 16         }else{
 17             try {
 18                 return sdf0.format(sdf.parse(s));    
 19             } catch (ParseException e) {
 20 //                e.printStackTrace();
 21                 return s;
 22             }
 23         }
 24     }
 25     public static String parseString(Date date){
 26         if(date!=null){
 27             return sdf1.format(date);
 28         }
 29         return "";
 30     }
 31     
 32     public static Date parseDate(String dateStr){
 33         if(!StringUtils.isBlank(dateStr)){
 34             try {
 35                 return sdf1.parse(dateStr);
 36             } catch (ParseException e) {
 37                 return new Date();
 38             }
 39         }
 40         return new Date();
 41     }
 42     
 43     /**
 44      * 从身份证获取出生日期,id需要位15位或18位身份证，否则失败
 45      * @param id
 46      * @return
 47      * @throws ParseException 
 48      */
 49     public static Date getBirthday(String id) throws ParseException{
 50         SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd");
 51         if(id.trim().length() == 18){
 52             String birthday = id.substring(6, 14);
 53             Date date = dateFormat.parse(birthday);
 54             return date;
 55         }
 56         if(id.trim().length() == 15){
 57             String birthday = id.substring(6,12);
 58             Date date = dateFormat.parse("19" + birthday);
 59             return date;
 60         }
 61         return null;
 62     }
 63     
 64     /**
 65      * String转Date，根据formatStr的格式来，异常：ParseException
 66      * @param dateStr
 67      * @param formatStr
 68      * @return
 69      * @throws ParseException
 70      */
 71     public static Date parseDate(String dateStr, String formatStr) throws ParseException{
 72         SimpleDateFormat dateFormat = new SimpleDateFormat(formatStr);
 73         return dateFormat.parse(dateStr);
 74     }
 75     
 76     /**
 77      * Date转String，根据formatStr的格式来
 78      * @param date
 79      * @param formatStr
 80      * @return
 81      */
 82     public static String formatDate(Date date, String formatStr){
 83         SimpleDateFormat dateFormat = new SimpleDateFormat(formatStr);
 84         return dateFormat.format(date);
 85     }
 86 
 87     /**
 88      * 在相关时间上增加一定数量的天数,输入Date，输出Date
 89      * @param date
 90      * @param num
 91      * @return
 92      */
 93     public static Date addDay(Date date, int num) {
 94         Calendar startDT = Calendar.getInstance();
 95         startDT.setTime(date);
 96         startDT.add(Calendar.DAY_OF_MONTH, num);
 97         return startDT.getTime();
 98     }
 99     
100 }

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原文地址：https://www.cnblogs.com/kongxianghao/p/8572509.html