DateUtils 工具类方法汇总
Posted 王六六的IT日常
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最近看项目代码，总是能看到这个工具类中的方法，总结一下
package com.huitian.eco.repair.utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* @author CDN
* @desc 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 || "".equals(datestr))
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.parseInt("19" + idno.substring(6, 8)));
cd.set(Calendar.MONTH, Integer.parseInt(idno.substring(8, 10)) - 1);
cd.set(Calendar.DAY_OF_MONTH, Integer.parseInt(idno.substring(10, 12)));
else if (idno.length() == 18)
cd.set(Calendar.YEAR, Integer.parseInt(idno.substring(6, 10)));
cd.set(Calendar.MONTH, Integer.parseInt(idno.substring(10, 12)) - 1);
cd.set(Calendar.DAY_OF_MONTH, Integer.parseInt(idno.substring(12, 14)));
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 iday 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 iyear 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 instanceof Date)
return (Date) date;
if (date instanceof String)
return DateUtils.stringToDate((String) date);
return null;
/**
* 时间工具类
*
* @author wangchao
*/
public class DateUtils extends org.apache.commons.lang3.time.DateUtils
private final static Logger logger = LoggerFactory.getLogger(DateUtils.class);
public static String YYYY = "yyyy";
public static String YYYY_MM = "yyyy-MM"DateUtils 时间工具类