日期格式数位工具类：日期格式互转
public final static String PATTERN = "yyyy-MM-dd";
public final static String PATTERN_TIME = "yyyy-MM-dd HH:mm:ss";
public static Date parseString(String date, String format)
throws ParseException {
SimpleDateFormat dateformat =
new SimpleDateFormat(format);
Date timestamp = dateformat.parse(date);
return timestamp;
}
public static String parseDate(Date date, String format) {
if (date == null) {
return null;
}
SimpleDateFormat dateformat = new SimpleDateFormat(format);
String timestamp = dateformat.format(date);
return timestamp;
}
public static String payPremiumToYuan(String payPremium) {
BigDecimal bdl = BigDecimal.valueOf(Integer.valueOf(payPremium));
String result = String.valueOf(bdl.multiply(BigDecimal.valueOf(0.01)));
return result;
}
/**
* 获取本周第一天
*
* @return
*/
public static String getFirstDayOfWeek() {
Calendar c = Calendar.getInstance(Locale.CHINA);
c.setFirstDayOfWeek(Calendar.MONDAY);
c.setTimeInMillis(System.currentTimeMillis());
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
return new SimpleDateFormat(PATTERN).format(c.getTime());
}
/**
* 获取本周最后一天
*
* @return
*/
public static String getLastDayOfWeek() {
String firstDayOfWeek = getFirstDayOfWeek();
try {
Date date = parseString(firstDayOfWeek, PATTERN);
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(Calendar.DAY_OF_MONTH, 6);
return new SimpleDateFormat(PATTERN).format(c.getTime());
} catch (ParseException e) {
e.printStackTrace();
}
return "";
}
/**
* 获取本月第一天
*
* @return
*/
public static String getFirstDayOfMonth() {
Calendar c = Calendar.getInstance(Locale.CHINA);
c.set(Calendar.DAY_OF_MONTH, 1);
return new SimpleDateFormat(PATTERN).format(c.getTime());
}
/**
* 获取本月最后一天
*
* @return
*/
public static String getLastDayOfMonth() {
Calendar c = Calendar.getInstance(Locale.CHINA);
c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
return new SimpleDateFormat(PATTERN).format(c.getTime());
}
测试以上方法：
public static void main(String[] args) {
Calendar c1 = Calendar.getInstance();
c1.set(c1.get(Calendar.YEAR), c1.get(Calendar.MONTH), c1.get(Calendar.DAY_OF_MONTH), 0, 0, 0); Calendar c2 = Calendar.getInstance(); c2.set(c2.get(Calendar.YEAR), c2.get(Calendar.MONTH), c2.get(Calendar.DAY_OF_MONTH), 0, 0, 0);
try { Date beginDate = DateUtil.parseString("2016-04-10", DateUtil.PATTERN); Date endDate = DateUtil.parseString("2016-04-14", DateUtil.PATTERN); Calendar c = Calendar.getInstance(); c.setTime(beginDate); long stepCount = 0L; while (beginDate.before(endDate)) { String userStepCount = "200"; if (!StringUtils.isEmpty(userStepCount)) { stepCount += Long.parseLong(userStepCount); } c.add(Calendar.DAY_OF_MONTH, 1); beginDate = c.getTime(); } } catch (NumberFormatException e) { e.printStackTrace(); } catch (ParseException e) { e.printStackTrace(); } }
========================================================
/**
* 将日期字符串转为日期
* @param date
* @param format
* @return
*/
public static Date parseDate(String date,String format){
if(date==null){
return null;
}
SimpleDateFormat sdf = new SimpleDateFormat(format);
try{
return sdf.parse(date);
}catch (ParseException e) {
return null;
}
}
/**
* 将日期字符串转为日期
* @param date
* @return
*/
public static Date parseDate(String date){
if(date!=null){
date = date.replaceAll("\\D", "");
return parseDate(date,"yyyyMMdd");
}
return null;
}
/**
* 将日期转换为指定格式字符串
* @param date
* @param format
* @return
*/
public static String formatDate(Date date,String format){
if(date==null){
return "";
}
try{
SimpleDateFormat sdf = new SimpleDateFormat(format);
return sdf.format(date);
}catch(IllegalArgumentException e){
return "";
}
}
/**
* 将日期字符串转换为指定的格式
* @param date
* @param srcFormat
* @param destFormat
* @return
*/
public static String formatDate(String date,String srcFormat,String destFormat){
if(date==null){
return "";
}
Date time = parseDate(date,srcFormat);
return formatDate(time,destFormat);
}
/**
* 将日期字符串转换为指定的格式
* @param date
* @param format
* @return
*/
public static String formatDate(String date,String format){
if(date==null){
return "";
}
date = date.replaceAll("\\D", "");
return formatDate(date,"yyyyMMdd",format);
}
/**
* 加减日期字段
* @param date
* @param addNum
* @param field 同Calendar add 参数
* @return
*/
public static Date addDateField(Date date,int addNum, int field) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(field, addNum);
return calendar.getTime();
}
/**
* 设置日期字段
* @param date
* @param value
* @param field 同Calendar set 参数
* @return
*/
public static Date setDateField(Date date,int value, int field) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(field, value);
return calendar.getTime();
}
/**
* 获取给定日期所在月的最后一天
* @param date
* @return
*/
public static Date getLastDayOfMonth(Date date){
date = addDateField(date,1, Calendar.MONTH);
date = setDateField(date,1, Calendar.DAY_OF_MONTH);
date = addDateField(date,-1, Calendar.DAY_OF_YEAR);
return date;
}
/**
* 返回以指定元素格式截去一部分的日期值
* @param date
* @param field
* @return
*/
public static Date truncDate(Date date,int field){
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
if(Calendar.MILLISECOND>=field)
date = setDateField(date,0, Calendar.MILLISECOND);
if(Calendar.SECOND>=field)
date = setDateField(date,0, Calendar.SECOND);
if(Calendar.MINUTE>=field)
date = setDateField(date,0, Calendar.MINUTE);
if(Calendar.HOUR_OF_DAY>=field)
date = setDateField(date,0, Calendar.HOUR_OF_DAY);
if(Calendar.DAY_OF_WEEK==field)
date = setDateField(date,Calendar.SUNDAY, Calendar.DAY_OF_WEEK);
if(Calendar.DAY_OF_MONTH==field)
date = setDateField(date,1, Calendar.DAY_OF_MONTH);
if(Calendar.DAY_OF_YEAR==field)
date = setDateField(date,1, Calendar.DAY_OF_YEAR);
return date;
}
/**
*
* @param beginDate
* @param endDate
* @return
*/
public static long compareTowDate(String beginDate,String endDate){
return compareTowDate(parseDate(beginDate),parseDate(endDate));
}
/**
*
* @param beginDate
* @param endDate
* @return
*/
public static long compareTowDate(Date beginDate,Date endDate){
long beginTime = beginDate==null?Long.MAX_VALUE:beginDate.getTime();
long endTime = endDate==null?Long.MAX_VALUE:endDate.getTime();
return endTime - beginTime;
}
/**
* 时间区间是否有重叠
* @param beginDate1 时间段1的开始时间
* @param endDate1 时间段1的结束时间
* @param beginDate2 时间段2的开始时间
* @param endDate2 时间段2的结束时间
* @return 没有重叠时返回 true,重叠返回false
*/
public static boolean checkDateRangesConstraint(Date beginDate1,Date endDate1,Date beginDate2,Date endDate2){
boolean checked = true;
long beginDate1Time = beginDate1==null?Long.MIN_VALUE:beginDate1.getTime();
long beginDate2Time = beginDate2==null?Long.MIN_VALUE:beginDate2.getTime();
long endDate1Time = endDate1==null?Long.MAX_VALUE:endDate1.getTime();
long endDate2Time = endDate2==null?Long.MAX_VALUE:endDate2.getTime();
//交叉的情况
if(beginDate1Time<=beginDate2Time&&endDate1Time>beginDate2Time){
checked = false;
}
//交叉的情况
if(beginDate1Time<endDate2Time&&endDate1Time>=endDate2Time){
checked = false;
}
//包含的情况
if(checkDateRangesInclude(beginDate1,endDate1,beginDate2,endDate2)){
checked = false;
}
//包含的情况
if(checkDateRangesInclude(beginDate2,endDate2,beginDate1,endDate1)){
checked = false;
}
return checked;
}
/**
* 时间区间是否有重叠
* @param beginDate1 时间段1的开始时间
* @param endDate1 时间段1的结束时间
* @param beginDate2 时间段2的开始时间
* @param endDate2 时间段2的结束时间
* @return 没有重叠时返回 true,重叠返回false
*/
public static boolean checkDateRangesConstraint(String beginDate1,String endDate1,String beginDate2,String endDate2){
return checkDateRangesConstraint(parseDate(beginDate1),parseDate(endDate1),parseDate(beginDate2),parseDate(endDate2));
}
/**
* 时间区间是否在另一时间期间内
* @param beginInnerDate 小时间段的开始时间
* @param endInnerDate 小时间段的结束时间
* @param beginOutDate 大时间段的开始时间
* @param endOutDate 大时间段的结束时间
* @return 当是包含关系时返回 true,否则返回false
*/
public static boolean checkDateRangesInclude(Date beginInnerDate,Date endInnerDate,Date beginOutDate,Date endOutDate){
boolean checked = true;
long beginInnerTime = beginInnerDate==null?Long.MIN_VALUE:beginInnerDate.getTime();
long beginOutTime = beginOutDate==null?Long.MIN_VALUE:beginOutDate.getTime();
long endInnerTime = endInnerDate==null?Long.MAX_VALUE:endInnerDate.getTime();
long endOutTime = endOutDate==null?Long.MAX_VALUE:endOutDate.getTime();
if(beginInnerTime<beginOutTime){
checked = false;
}
if(endInnerTime>endOutTime){
checked = false;
}
return checked;
}
/**
* 时间区间是否在另一时间期间内
* @param beginInnerDate 小时间段的开始时间
* @param endInnerDate 小时间段的结束时间
* @param beginOutDate 大时间段的开始时间
* @param endOutDate 大时间段的结束时间
* @return 当是包含关系时返回 true,否则返回false
*/
public static boolean checkDateRangesInclude(String beginInnerDate,String endInnerDate,String beginOutDate,String endOutDate){
return checkDateRangesInclude(parseDate(beginInnerDate),parseDate(endInnerDate),parseDate(beginOutDate),parseDate(endOutDate));
}
/**
* 时间区间是否有交集
* @param beginDate1 时间段1的开始时间
* @param endDate1 时间段1的结束时间
* @param beginDate2 时间段2的开始时间
* @param endDate2 时间段2的结束时间
* @return 当有交集时返回 true,否则返回false
*/
public static boolean checkDateRangesMixed(Date beginDate1,Date endDate1,Date beginDate2,Date endDate2){
boolean checked = true;
long beginTime1 = beginDate1==null?Long.MIN_VALUE:beginDate1.getTime();
long beginTime2 = beginDate2==null?Long.MIN_VALUE:beginDate2.getTime();
long endTime1 = endDate1==null?Long.MAX_VALUE:endDate1.getTime();
long endTime2 = endDate2==null?Long.MAX_VALUE:endDate2.getTime();
if(beginTime1>endTime2){
checked = false;
}
if(beginTime2>endTime1){
checked = false;
}
if(beginTime1==endTime2){
if(endTime2!=beginTime2)
checked = false;
}
if(beginTime2==endTime1){
if(endTime1!=beginTime1)
checked = false;
}
return checked;
}
/**
* 时间区间是否有交集
* @param beginDate1 时间段1的开始时间
* @param endDate1 时间段1的结束时间
* @param beginDate2 时间段2的开始时间
* @param endDate2 时间段2的结束时间
* @return 当有交集时返回 true,否则返回false
*/
public static boolean checkDateRangesMixed(String beginDate1,String endDate1,String beginDate2,String endDate2){
return checkDateRangesMixed(parseDate(beginDate1),parseDate(endDate1),parseDate(beginDate2),parseDate(endDate2));
}
public static int calculateAge(String birth) {
int age = -1;
Date birthDay = parseDate(birth,"yyyy-MM-dd");
Date sysdate = truncDate(new Date(),Calendar.HOUR_OF_DAY);
while(compareTowDate(birthDay,sysdate)>0){
age +=1;
birthDay = addDateField(birthDay,1,Calendar.YEAR);
}
return age;
}
public static Date addMonth(Date date,int value) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int actualDay = calendar.get(Calendar.DAY_OF_MONTH);
int actualMaxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
calendar.add(Calendar.MONTH, value);
if(actualDay ==actualMaxDay ){
calendar.set(Calendar.DAY_OF_MONTH, actualMaxDay);
}
return calendar.getTime();
}
测试以上方法：
public static void main(String[] args){ Calendar newCalendar = Calendar.getInstance(); newCalendar.set(1999, 1, 28); System.out.println(newCalendar.getMaximum(Calendar.DAY_OF_MONTH)); System.out.println(newCalendar.getActualMaximum(Calendar.DAY_OF_MONTH)); System.out.println(newCalendar.getActualMinimum(Calendar.DAY_OF_MONTH)); System.out.println(newCalendar.getGreatestMinimum(Calendar.DAY_OF_MONTH)); System.out.println(newCalendar.getLeastMaximum(Calendar.DAY_OF_MONTH));
}
