import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* 描述:公共日期工具类
*/
public class DateUtils {
public static String DATE_FORMAT =
"yyyy-MM-dd";
public static String DATE_TIME_FORMAT =
"yyyy-MM-dd HH:mm:ss";
public static String DATE_FORMAT_CHINESE =
"yyyy年M月d日";
/**
* 获取当前日期
*
*
* @return
*
*/
public static String
getCurrentDate() {
String datestr =
null;
SimpleDateFormat df =
new SimpleDateFormat(DateUtils.DATE_FORMAT);
datestr = df.format(
new Date());
return datestr;
}
/**
* 获取当前日期时间
*
*
* @return
*
*/
public static String
getCurrentDateTime() {
String datestr =
null;
SimpleDateFormat df =
new SimpleDateFormat(DateUtils.DATE_TIME_FORMAT);
datestr = df.format(
new Date());
return datestr;
}
/**
* 获取当前日期时间
*
*
* @return
*
*/
public static String
getCurrentDateTime(String Dateformat) {
String datestr =
null;
SimpleDateFormat df =
new SimpleDateFormat(Dateformat);
datestr = df.format(
new Date());
return datestr;
}
public static String
dateToDateTime(Date date) {
String datestr =
null;
SimpleDateFormat df =
new SimpleDateFormat(DateUtils.DATE_TIME_FORMAT);
datestr = df.format(date);
return datestr;
}
/**
* 将字符串日期转换为日期格式
*
*
* @param datestr
* @return
*
*/
public static Date
stringToDate(String datestr) {
if(datestr ==
null ||datestr.equals(
"")){
return null;
}
Date date =
new Date();
SimpleDateFormat df =
new SimpleDateFormat(DateUtils.DATE_FORMAT);
try {
date = df.parse(datestr);
}
catch (ParseException e) {
date=DateUtils.stringToDate(datestr,
"yyyyMMdd");
}
return date;
}
/**
* 将字符串日期转换为日期格式
* 自定義格式
*
* @param datestr
* @return
*
*/
public static Date
stringToDate(String datestr, String dateformat) {
Date date =
new Date();
SimpleDateFormat df =
new SimpleDateFormat(dateformat);
try {
date = df.parse(datestr);
}
catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 将日期格式日期转换为字符串格式
*
*
* @param date
* @return
*
*/
public static String
dateToString(Date date) {
String datestr =
null;
SimpleDateFormat df =
new SimpleDateFormat(DateUtils.DATE_FORMAT);
datestr = df.format(date);
return datestr;
}
/**
* 将日期格式日期转换为字符串格式 自定義格式
*
* @param date
* @param dateformat
* @return
*/
public static String
dateToString(Date date, String dateformat) {
String datestr =
null;
SimpleDateFormat df =
new SimpleDateFormat(dateformat);
datestr = df.format(date);
return datestr;
}
/**
* 获取日期的DAY值
*
*
* @param date
* 输入日期
* @return
*
*/
public static int getDayOfDate(Date date) {
int d =
0;
Calendar cd = Calendar.getInstance();
cd.setTime(date);
d = cd.get(Calendar.DAY_OF_MONTH);
return d;
}
/**
* 获取日期的MONTH值
*
*
* @param date
* 输入日期
* @return
*
*/
public static int getMonthOfDate(Date date) {
int m =
0;
Calendar cd = Calendar.getInstance();
cd.setTime(date);
m = cd.get(Calendar.MONTH) +
1;
return m;
}
/**
* 获取日期的YEAR值
*
*
* @param date
* 输入日期
* @return
*
*/
public static int getYearOfDate(Date date) {
int y =
0;
Calendar cd = Calendar.getInstance();
cd.setTime(date);
y = cd.get(Calendar.YEAR);
return y;
}
/**
* 获取星期几
*
*
* @param date
* 输入日期
* @return
*
*/
public static int getWeekOfDate(Date date) {
int wd =
0;
Calendar cd = Calendar.getInstance();
cd.setTime(date);
wd = cd.get(Calendar.DAY_OF_WEEK) -
1;
return wd;
}
/**
* 获取输入日期的当月第一天
*
*
* @param date
* 输入日期
* @return
*
*/
public static Date
getFirstDayOfMonth(Date date) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
cd.set(Calendar.DAY_OF_MONTH,
1);
return cd.getTime();
}
/**
* 获得输入日期的当月最后一天
*
* @param date
*/
public static Date
getLastDayOfMonth(Date date) {
return DateUtils.addDay(DateUtils.getFirstDayOfMonth(DateUtils.addMonth(date,
1)), -
1);
}
/**
* 判断是否是闰年
*
*
* @param date
* 输入日期
* @return 是true 否false
*
*/
public static boolean isLeapYEAR(Date date) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
int year = cd.get(Calendar.YEAR);
if (year %
4 ==
0 && year %
100 !=
0 | year %
400 ==
0) {
return true;
}
else {
return false;
}
}
/**
* 根据整型数表示的年月日，生成日期类型格式
*
* @param year
* 年
* @param month
* 月
* @param day
* 日
* @return
*
*/
public static Date
getDateByYMD(
int year,
int month,
int day) {
Calendar cd = Calendar.getInstance();
cd.set(year, month-
1, day);
return cd.getTime();
}
/**
* 获取年周期对应日
*
* @param date
* 输入日期
* @param iyear
* 年数 負數表示之前
* @return
*
*/
public static Date
getYearCycleOfDate(Date date,
int iyear) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
cd.add(Calendar.YEAR, iyear);
return cd.getTime();
}
/**
* 获取月周期对应日
*
* @param date
* 输入日期
* @param i
* @return
*
*/
public static Date
getMonthCycleOfDate(Date date,
int i) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
cd.add(Calendar.MONTH, i);
return cd.getTime();
}
/**
* 计算 fromDate 到 toDate 相差多少年
*
* @param fromDate
* @param toDate
* @return 年数
*
*/
public static int getYearByMinusDate(Date fromDate, Date toDate) {
Calendar df=Calendar.getInstance();
df.setTime(fromDate);
Calendar dt=Calendar.getInstance();
dt.setTime(toDate);
return dt.get(Calendar.YEAR)-df.get(Calendar.YEAR);
}
/**
* 计算 fromDate 到 toDate 相差多少个月
*
* @param fromDate
* @param toDate
* @return 月数
*
*/
public static int getMonthByMinusDate(Date fromDate, Date toDate) {
Calendar df=Calendar.getInstance();
df.setTime(fromDate);
Calendar dt=Calendar.getInstance();
dt.setTime(toDate);
return dt.get(Calendar.YEAR)*
12+dt.get(Calendar.MONTH)-
(df.get(Calendar.YEAR)*
12+df.get(Calendar.MONTH));
}
/**
* 计算 fromDate 到 toDate 相差多少天
*
* @param fromDate
* @param toDate
* @return 天数
*
*/
public static long getDayByMinusDate(Object fromDate, Object toDate) {
Date f=DateUtils.chgObject(fromDate);
Date t=DateUtils.chgObject(toDate);
long fd=f.getTime();
long td=t.getTime();
return (td-fd)/(
24L *
60L *
60L *
1000L);
}
/**
* 计算年龄
*
* @param birthday
* 生日日期
* @param calcDate
* 要计算的日期点
* @return
*
*/
public static int calcAge(Date birthday, Date calcDate) {
int cYear=DateUtils.getYearOfDate(calcDate);
int cMonth=DateUtils.getMonthOfDate(calcDate);
int cDay=DateUtils.getDayOfDate(calcDate);
int bYear=DateUtils.getYearOfDate(birthday);
int bMonth=DateUtils.getMonthOfDate(birthday);
int bDay=DateUtils.getDayOfDate(birthday);
if(cMonth>bMonth||(cMonth==bMonth&&cDay>bDay)){
return cYear-bYear;
}
else{
return cYear-
1-bYear;
}
}
/**
* 从身份证中获取出生日期
*
* @param idno
* 身份证号码
* @return
*
*/
public static String
getBirthDayFromIDCard(String idno) {
Calendar cd = Calendar.getInstance();
if (idno.length() ==
15) {
cd.set(Calendar.YEAR, Integer.valueOf(
"19" + idno.substring(
6,
8))
.intValue());
cd.set(Calendar.MONTH, Integer.valueOf(idno.substring(
8,
10))
.intValue() -
1);
cd.set(Calendar.DAY_OF_MONTH,
Integer.valueOf(idno.substring(
10,
12)).intValue());
}
else if (idno.length() ==
18) {
cd.set(Calendar.YEAR, Integer.valueOf(idno.substring(
6,
10))
.intValue());
cd.set(Calendar.MONTH, Integer.valueOf(idno.substring(
10,
12))
.intValue() -
1);
cd.set(Calendar.DAY_OF_MONTH,
Integer.valueOf(idno.substring(
12,
14)).intValue());
}
return DateUtils.dateToString(cd.getTime());
}
/**
* 在输入日期上增加（+）或减去（-）天数
*
* @param date
* 输入日期
* @param imonth
* 要增加或减少的天数
*/
public static Date
addDay(Date date,
int iday) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
cd.add(Calendar.DAY_OF_MONTH, iday);
return cd.getTime();
}
/**
* 在输入日期上增加（+）或减去（-）月份
*
* @param date
* 输入日期
* @param imonth
* 要增加或减少的月分数
*/
public static Date
addMonth(Date date,
int imonth) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
cd.add(Calendar.MONTH, imonth);
return cd.getTime();
}
/**
* 在输入日期上增加（+）或减去（-）年份
*
* @param date
* 输入日期
* @param imonth
* 要增加或减少的年数
*/
public static Date
addYear(Date date,
int iyear) {
Calendar cd = Calendar.getInstance();
cd.setTime(date);
cd.add(Calendar.YEAR, iyear);
return cd.getTime();
}
/**
* 將OBJECT類型轉換為Date
* @param date
* @return
*/
public static Date
chgObject(Object date){
if(date!=
null&&date
instanceof Date){
return (Date)date;
}
if(date!=
null&&date
instanceof String){
return DateUtils.stringToDate((String)date);
}
return null;
}
public static long getAgeByBirthday(String date){
Date birthday = stringToDate(date,
"yyyy-MM-dd");
long sec =
new Date().getTime() - birthday.getTime();
long age = sec/(
1000*
60*
60*
24)/
365;
return age;
}
/**
* @param args
*/
public static void main(String[] args) {
long s=DateUtils.getDayByMinusDate(
"2012-01-01",
"2012-12-31");
System.err.println(s);
}
}
转载于:https://www.cnblogs.com/bilaisheng/p/10211022.html
相关资源：java时间处理工具类--DateUtils
