版权声明：版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_24347541/article/details/88888628
package sy.util.base;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
public class DateUtil {
public static void main(String[] args) {
String a="123,234";
String[] b=a.split(",");
System.out.println(b[1]);
}
/**
* 日期转字符串
*
* @param date
* 日期
* @param pattern
* 格式
* @return
*/
public static String dateToString(Date date, String pattern) {
if (date != null) {
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
return sdf.format(date);
}
return "";
}
/**
* 日期转字符串
*
* @param date
* @return
*/
public static String dateToString(Date date) {
return dateToString(date, "yyyy-MM-dd hh:mm:ss");
}
public static String dateToStrings(Date date) {
return dateToString(date, "yyyy-MM-dd")+" ";
}
private static final SimpleDateFormat longDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private static final SimpleDateFormat shortDateFormat = new SimpleDateFormat("yyyy-MM-dd");
/**
* 根据一个日期，返回是星期几的字符串
*/
private static String getWeek (String strDate) {
// 再转换为时间
Date date = null;
try {
date = shortDateFormat.parse(strDate);
} catch (ParseException e) {
e.printStackTrace();
}
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return new SimpleDateFormat("EEEE").format(calendar.getTime());
}
/**
* 取当天(短日期类型)
*/
public static String getShortToday () {
Date today = new Date();
return shortDateFormat.format(today);
}
/**
* 取明天(短日期类型)
*/
public static String getShortTomorrow (){
Date date=new Date();//取时间
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
calendar.add(calendar.DATE,1);//把日期往后增加一天.整数往后推,负数往前移动
date=calendar.getTime(); //这个时间就是日期往后推一天的结果
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(date);
return dateString;
}
/**
* 取当天(长日期类型)
*/
private static String getLongToday () {
Date today = new Date();
return longDateFormat.format(today);
}
/**
* 取当天零点零分零秒
*/
public static String getTodayStart () {
Calendar calendar = Calendar.getInstance();
//如果没有这种设定的话回去系统的当期的时间
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
Date date = new Date(calendar.getTimeInMillis());
return longDateFormat.format(date);
}
/**
* 取当天23点59分59秒
*/
public static String getTodayEnd () {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
Date date = new Date(calendar.getTimeInMillis());
return longDateFormat.format(date);
}
/**
* 取特定日期的零点零分零秒
*/
public static String getDateStart (String strDate) {
if (null == strDate || "".equals(strDate.trim())) {
return "";
}
Date date = null;
try {
date = shortDateFormat.parse(strDate);
} catch (ParseException e) {
e.printStackTrace();
}
return longDateFormat.format(date);
}
/**
* 取特定日期的59分59秒
*/
public static String getDateEnd (String strDate) {
if (null == strDate || "".equals(strDate.trim())) {
return "";
}
Date date = null;
try {
date = shortDateFormat.parse(strDate);
} catch (ParseException e) {
e.printStackTrace();
}
//这样能够取到59分59秒
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.HOUR_OF_DAY, 23);
calendar.set(Calendar.MINUTE, 59);
calendar.set(Calendar.SECOND, 59);
calendar.set(Calendar.MILLISECOND, 0);
return longDateFormat.format(calendar.getTime());
}
/**
* 取当周周一
*/
private static String getMondayOfThisWeek () {
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0){
day_of_week = 7;
}
calendar.add(Calendar.DATE, -day_of_week + 1);
/*calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);*/
return shortDateFormat.format(calendar.getTime());
}
/**
* 取当周周日
*/
private static String getSundayOfThisWeek () {
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0){
day_of_week = 7;
}
calendar.add(Calendar.DATE, -day_of_week + 1);
/*calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);*/
//以上取得的是周一
calendar.add(Calendar.DATE, 6);
return shortDateFormat.format(calendar.getTime());
}
/**
* 取上周周一
*/
private static String getMondayOfPreviousWeek () {
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0){
day_of_week = 7;
}
calendar.add(Calendar.DATE, -day_of_week + 1);
calendar.add(Calendar.DATE, -7);
return shortDateFormat.format(calendar.getTime());
}
/**
* 取上周周日
*/
private static String getSundayOfPreviousWeek () {
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0){
day_of_week = 7;
}
calendar.add(Calendar.DATE, -day_of_week + 1);
calendar.add(Calendar.DATE, -1);
return shortDateFormat.format(calendar.getTime());
}
/**
* 取下周周一
*/
private static String getMondayOfNextWeek () {
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0){
day_of_week = 7;
}
calendar.add(Calendar.DATE, -day_of_week + 1); // 当周周一
calendar.add(Calendar.DATE, 7);
return shortDateFormat.format(calendar.getTime());
}
/**
* 取下周周日
*/
private static String getSundayOfNextWeek () {
Calendar calendar = Calendar.getInstance();
int day_of_week = calendar.get(Calendar.DAY_OF_WEEK) - 1;
if (day_of_week == 0){
day_of_week = 7;
}
calendar.add(Calendar.DATE, -day_of_week + 1); // 当周周一
calendar.add(Calendar.DATE, 13);
return shortDateFormat.format(calendar.getTime());
}
/**
* 取当月1号
*/
public static String getFirstDayOfThisMonth () {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设为当前月的1号
return shortDateFormat.format(calendar.getTime());
}
/**
* 取当月最后一天
*/
public static String getLastDayOfThisMonth () {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设为当前月的1号
calendar.add(Calendar.MONTH, 1); // 加一个月，变为下月的1号
calendar.add(Calendar.DATE, -1); // 减去一天，变为当月最后一天
return shortDateFormat.format(calendar.getTime());
}
/**
* 取上月1号
*/
public static String getFirstDayOfPreviousMonth() {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设为当前月的1号
calendar.add(Calendar.MONTH, -1); // 减一个月，变为上月的1号
return shortDateFormat.format(calendar.getTime());
}
/**
* 取上月最后一天
*/
public static String getLastDayOfPreviousMonth () {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DATE, 1); // 设为当前月的1号
calendar.add(Calendar.DATE, -1); // 减去一天，变为上月最后一天
return shortDateFormat.format(calendar.getTime());
}
/**
* 取下月1号
*/
private static String getFirstDayOfNextMonth () {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, 1); // 加一个月
calendar.set(Calendar.DATE, 1); // 把日期设置为当月第一天
return shortDateFormat.format(calendar.getTime());
}
/**
* 取下月最后一天
*/
private static String getLastDayOfNextMonth () {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, 1);// 加一个月
calendar.set(Calendar.DATE, 1);// 把日期设置为当月第一天
calendar.roll(Calendar.DATE, -1);// 日期回滚一天，也就是本月最后一天
return shortDateFormat.format(calendar.getTime());
}
/**
* 获得本年有多少天
*/
private static int getTotalDaysOfThisYear() {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_YEAR, 1);// 把日期设为当年第一天
calendar.roll(Calendar.DAY_OF_YEAR, -1);// 把日期回滚一天。
int totalDays = calendar.get(Calendar.DAY_OF_YEAR);
return totalDays;
}
/**
* 获取某年某月的最后一天
*/
private static int getLastDayOfMonth (int year, int month) {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
return 31;
}
if (month == 4 || month == 6 || month == 9 || month == 11) {
return 30;
}
if (month == 2) {
if (isLeapYear(year)) {
return 29;
} else {
return 28;
}
}
return 0;
}
/**
* 是否闰年
*/
public static boolean isLeapYear (int year) {
return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}
/**
* 获得本年第一天的日期
*/
public static String getFirstDayOfThisYear () {
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH, 1);
calendar.set(Calendar.DAY_OF_YEAR, 1);
Date date = new Date(calendar.getTimeInMillis());
return shortDateFormat.format(date);
}
/**
* 获得本年最后一天的日期
*/
public static String getLastDayOfThisYear () {
Date date = new Date();
String years = new SimpleDateFormat("yyyy").format(date);
return years + "-12-31";
}
/**
* 获得上年第一天的日期 *
*/
public static String getFirstDayOfPreviousYear () {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR, -1); // 若是 明年改为正整数1即可
calendar.set(Calendar.MONTH, 1);
calendar.set(Calendar.DAY_OF_YEAR, 1);
Date date = new Date(calendar.getTimeInMillis());
return shortDateFormat.format(date);
}
/**
* 两个时间之间的天数
*/
public static long getDays (String date1, String date2) {
if (date1 == null || "".equals(date1.trim())) {
return 0;
}
if (date2 == null || "".equals(date2.trim())) {
return 0;
}
// 转换为标准时间
Date date = null;
Date mydate = null;
try {
date = shortDateFormat.parse(date1);
mydate = shortDateFormat.parse(date2);
} catch (Exception e) {
e.printStackTrace();
}
long day = 0;
if (date.before(mydate)) {
day = (mydate.getTime() - date.getTime()) / (24 * 60 * 60 * 1000);
} else {
day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
}
return day;
}
/**
* 获取某个时间后的某前后几天
* 返回结果为yyyy-mm-dd
*/
public static Date beforeorafterDays(Date inputDate,int changeDate){
String result="";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar calendar = new GregorianCalendar();
calendar.setTime(inputDate);
calendar.add(calendar.DATE,changeDate);
inputDate=calendar.getTime();
result=format.format(inputDate);
try {
inputDate = format.parse(result);
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return inputDate;
}
/**
* 获取当前日期是星期几<br>
*
* @param date
* @return 当前日期是星期几
*/
public static int getWeekOfDate(Date date) {
//String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (w < 0)
w = 0;
//return weekDays[w];
return w;
}
/**
* 获取当前时间加分钟数
*
* @param minutes
* @return
*/
public static String addNowDate(Integer minutes) {
Calendar nowTime = Calendar.getInstance();
nowTime.add(Calendar.MINUTE, minutes);
return dateToString(nowTime.getTime(),"yyyy-MM-dd HH:mm:ss");
}
}