日期时间比较大小(yyyy-MM-dd或者yyyy-MM-dd HH:mm:ss格式比较大小)、获取一年内所有周六日时间和当天之后的周六日时间
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2022-08-10 22:50:51
package com.common.utils;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.List;public class DateUtils {public static String PATTERN...
package com.common.utils;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
public class DateUtils {
public static String PATTERN10 = "yyyy-MM-dd";
public static String PATTERN19 = "yyyy-MM-dd HH:mm:ss";
public static void main(String[] args) throws Exception {
String date1 = "2020-11-26 10:01:23";
String date2 = "2020-11-20 10:01:23";
SimpleDateFormat dateFormat = new SimpleDateFormat(PATTERN10);
Date dt1 = dateFormat.parse(date1);
Date dt2 = dateFormat.parse(date2);
System.out.println("date1和date2年月日时分秒比较大小:" + dateCompareTime(date1, date2));
System.out.println("date1和date2年月日比较大小:" + dateCompare(date1, date2));
System.out.println("dt1和dt2比较大小:" + dateCompare(dt1, dt2));
System.out.println("当前日之后的周六日时间集:" + weekendDate());
System.out.println("一年中的所有周六日时间集:" + weekendDate(2020));
}
/**
* 获取当前日之后的周六日时间
* @title: weekendDate
* @return
*/
public static List<String> weekendDate() {
System.out.println("======获取当前日之后的周六日时间======");
List<String> dateList = new ArrayList<String>();
Date date = new Date();
Calendar cDate = Calendar.getInstance();
int year = cDate.get(Calendar.YEAR); // 获取当前年份
SimpleDateFormat simdf = new SimpleDateFormat(PATTERN10);
String date1 = simdf.format(date);
System.out.println(date1); // 当天日期
Calendar calendar = new GregorianCalendar(year, 0, 1);
int i = 1;
while (calendar.get(Calendar.YEAR) < year + 1) {
calendar.set(Calendar.WEEK_OF_YEAR, i++);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
String date2 = simdf.format(calendar.getTime());
if (calendar.get(Calendar.YEAR) == year) {
if (!dateCompare(date1, date2)) {
System.out.println("周日:" + date2);
dateList.add(simdf.format(calendar.getTime()));
}
}
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
String date3 = simdf.format(calendar.getTime());
if (calendar.get(Calendar.YEAR) == year) {
if (!dateCompare(date1, date3)) {
System.out.println("周六:" + date3);
dateList.add(simdf.format(calendar.getTime()));
}
}
}
return dateList;
}
/**
* 获取一年中的所有周六日时间
* @title: weekendDate
* @param year 年份
* @return
*/
public static List<String> weekendDate(int year) {
System.out.println("======获取一年中的所有周六日时间======");
List<String> dateList = new ArrayList<String>();
SimpleDateFormat simdf = new SimpleDateFormat(PATTERN10);
Calendar calendar = new GregorianCalendar(year, 0, 1);
int i = 1;
while (calendar.get(Calendar.YEAR) < year + 1) {
calendar.set(Calendar.WEEK_OF_YEAR, i++);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
if (calendar.get(Calendar.YEAR) == year) {
System.out.println("周日:" + simdf.format(calendar.getTime()));
dateList.add(simdf.format(calendar.getTime()));
}
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
if (calendar.get(Calendar.YEAR) == year) {
System.out.println("周六:" + simdf.format(calendar.getTime()));
dateList.add(simdf.format(calendar.getTime()));
}
}
return dateList;
}
/**
* @title: dateCompare
* @description: 比较日期大小:yyyy-MM-dd HH:mm:ss String类型
* @param date1 日期1
* @param date2 日期2
* @return
*/
public static boolean dateCompareTime(String date1, String date2) {
boolean bf = false;
try {
SimpleDateFormat dateFormat = new SimpleDateFormat(PATTERN19);
Date dt1 = dateFormat.parse(date1);
Date dt2 = dateFormat.parse(date2);
// 比较大小
if (dt1.getTime() > dt2.getTime()) {
bf = true;
}
} catch (Exception e) {
e.printStackTrace();
}
return bf;
}
/**
* @title: dateCompare
* @description: 比较日期大小:yyyy-MM-dd String类型
* @param date1 日期1
* @param date2 日期2
* @return
*/
public static boolean dateCompare(String date1, String date2) {
boolean bf = false;
try {
SimpleDateFormat dateFormat = new SimpleDateFormat(PATTERN10);
Date dt1 = dateFormat.parse(date1);
Date dt2 = dateFormat.parse(date2);
// 比较大小
if (dt1.getTime() > dt2.getTime()) {
bf = true;
}
} catch (Exception e) {
e.printStackTrace();
}
return bf;
}
/**
* @title: dateCompare
* @description: 比较日期大小:yyyy-MM-dd Date类型
* @param date1 日期1
* @param date2 日期2
* @return
*/
public static boolean dateCompare(Date date1, Date date2) {
boolean bf = false;
// 比较大小
if (date1.getTime() > date2.getTime()) {
bf = true;
}
return bf;
}
}
本文地址:https://blog.csdn.net/u013526643/article/details/110198757