127 lines
3.4 KiB
Java
127 lines
3.4 KiB
Java
package com.qiwenshare.common.cbb;
|
||
|
||
import java.text.DateFormat;
|
||
import java.text.ParseException;
|
||
import java.text.SimpleDateFormat;
|
||
import java.util.Calendar;
|
||
import java.util.Date;
|
||
|
||
public class DateUtil {
|
||
/**
|
||
* 获取系统当前时间
|
||
*
|
||
* @return 系统当前时间
|
||
*/
|
||
public static String getCurrentTime() {
|
||
Date date = new Date();
|
||
String stringDate = String.format("%tF %<tT", date);
|
||
return stringDate;
|
||
}
|
||
|
||
/**
|
||
* @param formatString 格式，如"yyyy-MM-dd"
|
||
* @param stringDate 日期字符串，如"2000-03-19"
|
||
* @return 日期
|
||
* @throws ParseException 解析异常
|
||
*/
|
||
public static Date getDateByFormatString(String formatString, String stringDate) throws ParseException {
|
||
DateFormat dateFormat = new SimpleDateFormat(formatString);
|
||
Date date = dateFormat.parse(stringDate);
|
||
return date;
|
||
}
|
||
|
||
/**
|
||
* 格式化date
|
||
*
|
||
* @param formatString 格式，如"yyyy-MM-dd"
|
||
* @param stringDate 日期字符串，如"2000-03-19"
|
||
* @return SQL日期
|
||
* @throws ParseException 解析异常
|
||
*/
|
||
public static java.sql.Date getSqlDateByFormatString(String formatString, String stringDate) throws ParseException {
|
||
long longtime = DateUtil.getDateByFormatString("yyyyMMdd", stringDate).getTime();
|
||
return new java.sql.Date(longtime);
|
||
}
|
||
|
||
/**
|
||
* 两个日期相差天数
|
||
*
|
||
* @param preDate 第一个时间日期
|
||
* @param afterDate 第二个时间十七
|
||
* @return 相差的天数
|
||
*/
|
||
public static int getDifferentDays(Date preDate, Date afterDate) {
|
||
|
||
int preYear = getYear(preDate);
|
||
int afterYear = getYear(afterDate);
|
||
int preDayOfYear = getDayOfYear(preDate);
|
||
int afterDayOfYear = getDayOfYear(afterDate);
|
||
|
||
if (afterYear - preYear == 0) {
|
||
return afterDayOfYear - preDayOfYear;
|
||
} else {
|
||
int diffDay = 0;
|
||
while (preYear < afterYear) {
|
||
if (diffDay == 0 && isLeapYear(preYear)) {
|
||
diffDay = 366 - preDayOfYear;
|
||
} else if (diffDay == 0 && !isLeapYear(preYear)) {
|
||
diffDay = 365 - preDayOfYear;
|
||
} else if (isLeapYear(preYear)) {
|
||
diffDay += 366;
|
||
} else {
|
||
diffDay += 365;
|
||
}
|
||
preYear++;
|
||
}
|
||
|
||
diffDay += afterDayOfYear;
|
||
return diffDay;
|
||
|
||
}
|
||
|
||
|
||
}
|
||
|
||
/**
|
||
* 一年中的第几天
|
||
*
|
||
* @param date 日期
|
||
* @return 第几天
|
||
*/
|
||
public static int getDayOfYear(Date date) {
|
||
Calendar cal = Calendar.getInstance();
|
||
cal.setTime(date);
|
||
int day = cal.get(Calendar.DAY_OF_YEAR);
|
||
return day;
|
||
}
|
||
|
||
/**
|
||
* 获取年份
|
||
* jdk推荐写法，date.getYear()已被废弃
|
||
*
|
||
* @param date 日期
|
||
* @return 年份
|
||
*/
|
||
public static int getYear(Date date) {
|
||
Calendar calendar = Calendar.getInstance();
|
||
calendar.setTime(date);
|
||
int year = calendar.get(Calendar.YEAR);
|
||
return year;
|
||
}
|
||
|
||
/**
|
||
* 判断是否是闰年
|
||
*
|
||
* @param year 年，如2010
|
||
* @return 是否闰年
|
||
*/
|
||
public static boolean isLeapYear(int year) {
|
||
if ((year % 4 == 0 && year % 100 != 0)
|
||
|| year % 400 == 0) {
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
}
|