package com.boob.common.utils;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* @description:Date时间工具类
* @author:boob
* @since:2020/2/9
*/
public class DateUtils {
private final static SimpleDateFormat sdfYear = new SimpleDateFormat("yyyy");
private final static SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");
private final static SimpleDateFormat sdfDays = new SimpleDateFormat("yyyyMMdd");
private final static SimpleDateFormat sdfTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private final static SimpleDateFormat sdfTimeString = new SimpleDateFormat("yyyyMMddHHmmss");
/**
* 获取YYYY格式
*
* @return
*/
public static String getYear() {
return sdfYear.format(new Date());
}
/**
* 获取YYYY-MM-DD格式
*
* @return
*/
public static String getDay() {
return sdfDay.format(new Date());
}
/**
* 获取YYYYMMDD格式
*
* @return
*/
public static String getDays() {
return sdfDays.format(new Date());
}
/**
* 获取YYYY-MM-DD HH:mm:ss格式
*
* @return
*/
public static String getTime() {
return sdfTime.format(new Date());
}
/**
* 获取YYYYMMDDHHmmss格式
*
* @return
*/
public static String getTimeString() {
return sdfTimeString.format(new Date());
}
/**
* @param s
* @param e
* @return boolean
* @throws
* @Title: compareDate
* @Description: TODO(日期比较 , 如果s > = e 返回true 否则返回false)
*/
public static boolean compareDate(String s, String e) {
if (fomatDate(s) == null || fomatDate(e) == null) {
return false;
}
return fomatDate(s).getTime() >= fomatDate(e).getTime();
}
/**
* 格式化日期
*
* @return
*/
public static Date fomatDate(String date) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
return fmt.parse(date);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
/**
* 校验日期是否合法
*
* @return
*/
public static boolean isValidDate(String s) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
fmt.parse(s);
return true;
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException,就说明格式不对
return false;
}
}
public static int getDiffYear(String startTime, String endTime) {
DateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
try {
int years = (int) (((fmt.parse(endTime).getTime() - fmt.parse(startTime).getTime()) / (1000 * 60 * 60 * 24)) / 365);
return years;
} catch (Exception e) {
// 如果throw java.text.ParseException或者NullPointerException,就说明格式不对
return 0;
}
}
/**
* <li>功能描述:时间相减得到天数
*
* @param beginDateStr
* @param endDateStr
* @return long
*/
public static long getDaySub(String beginDateStr, String endDateStr) {
long day = 0;
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Date beginDate = null;
Date endDate = null;
try {
beginDate = format.parse(beginDateStr);
endDate = format.parse(endDateStr);
} catch (ParseException e) {
e.printStackTrace();
}
day = (endDate.getTime() - beginDate.getTime()) / (24 * 60 * 60 * 1000);
//System.out.println("相隔的天数="+day);
return day;
}
/**
* 得到n天之后的日期
*
* @param days
* @return
*/
public static String getAfterDayDate(String days) {
int daysInt = Integer.parseInt(days);
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
SimpleDateFormat sdfd = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateStr = sdfd.format(date);
return dateStr;
}
/**
* 得到n天之后是周几
*
* @param days
* @return
*/
public static String getAfterDayWeek(String days) {
int daysInt = Integer.parseInt(days);
Calendar canlendar = Calendar.getInstance(); // java.util包
canlendar.add(Calendar.DATE, daysInt); // 日期减 如果不够减会将月变动
Date date = canlendar.getTime();
SimpleDateFormat sdf = new SimpleDateFormat("E");
String dateStr = sdf.format(date);
return dateStr;
}
/**
* description 获得当前时间之前或之后几个月的日期
*
* @param amount 值可正可负,负<==>before 正<==>after
* @return String yyyy-MM-dd HH:mm:ss
*/
public static String getAfterMonthDate(Integer amount) {
Date nowDate = new Date(); //获取当前时间
Calendar cl = Calendar.getInstance(); //获取日历类实例
cl.setTime(nowDate); //设置当前时间
cl.add(Calendar.MONTH, amount); //
return sdfTime.format(cl.getTime());
}
/**
* description 获得当前时间之前或之后几年的日期
*
* @param amount 值可正可负,负<==>before 正<==>after
* @return String yyyy-MM-dd HH:mm:ss
*/
public static String getAfterYearDate(Integer amount) {
Date nowDate = new Date(); //获取当前时间
Calendar cl = Calendar.getInstance(); //获取日历类实例
cl.setTime(nowDate); //设置当前时间
cl.add(Calendar.YEAR, amount); //
return sdfTime.format(cl.getTime());
}
}
Java - Date时间工具类
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转载自blog.csdn.net/BUG_call110/article/details/104300340
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