Java用于取得当前日期相对应的月初，月末，季初，季末，年初，年末时间

转自：https://www.cnblogs.com/lr393993507/p/5542689.html

package com.zrar.date;
import java.util.Calendar;
/**
*
* 描述:此类用于取得当前日期相对应的月初，月末，季初，季末，年初，年末，返回值均为String字符串
* 1、得到当前日期 today()
* 2、得到当前月份月初 thisMonth()
* 3、得到当前月份月底 thisMonthEnd()
* 4、得到当前季度季初 thisSeason()
* 5、得到当前季度季末 thisSeasonEnd()
* 6、得到当前年份年初 thisYear()
* 7、得到当前年份年底 thisYearEnd()
* 8、判断输入年份是否为闰年 leapYear
*
* 注意事项: 日期格式为：xxxx-yy-zz (eg: 2007-12-05)
*
* 实例:
*
* @author pure
*/
public class DateThis {
private int x; // 日期属性：年
private int y; // 日期属性：月
private int z; // 日期属性：日
private Calendar localTime; // 当前日期
public DateThis() {
localTime = Calendar.getInstance();
}
/**
* 功能：得到当前日期 格式为：xxxx-yy-zz (eg: 2007-12-05)<br>
* @return String
* @author pure
*/
public String today() {
String strY = null;
String strZ = null;
x = localTime.get(Calendar.YEAR);
y = localTime.get(Calendar.MONTH) + 1;
z = localTime.get(Calendar.DATE);
strY = y >= 10 ? String.valueOf(y) : ("0" + y);
strZ = z >= 10 ? String.valueOf(z) : ("0" + z);
return x + "-" + strY + "-" + strZ;
}
/**
* 功能：得到当前月份月初 格式为：xxxx-yy-zz (eg: 2007-12-01)<br>
* @return String
* @author pure
*/
public String thisMonth() {
String strY = null;
x = localTime.get(Calendar.YEAR);
y = localTime.get(Calendar.MONTH) + 1;
strY = y >= 10 ? String.valueOf(y) : ("0" + y);
return x + "-" + strY + "-01";
}
/**
* 功能：得到当前月份月底 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
* @return String
* @author pure
*/
public String thisMonthEnd() {
String strY = null;
String strZ = null;
boolean leap = false;
x = localTime.get(Calendar.YEAR);
y = localTime.get(Calendar.MONTH) + 1;
if (y == 1 || y == 3 || y == 5 || y == 7 || y == 8 || y == 10 || y == 12) {
strZ = "31";
}
if (y == 4 || y == 6 || y == 9 || y == 11) {
strZ = "30";
}
if (y == 2) {
leap = leapYear(x);
if (leap) {
strZ = "29";
}
else {
strZ = "28";
}
}
strY = y >= 10 ? String.valueOf(y) : ("0" + y);
return x + "-" + strY + "-" + strZ;
}
/**
* 功能：得到当前季度季初 格式为：xxxx-yy-zz (eg: 2007-10-01)<br>
* @return String
* @author pure
*/
public String thisSeason() {
String dateString = "";
x = localTime.get(Calendar.YEAR);
y = localTime.get(Calendar.MONTH) + 1;
if (y >= 1 && y <= 3) {
dateString = x + "-" + "01" + "-" + "01";
}
if (y >= 4 && y <= 6) {
dateString = x + "-" + "04" + "-" + "01";
}
if (y >= 7 && y <= 9) {
dateString = x + "-" + "07" + "-" + "01";
}
if (y >= 10 && y <= 12) {
dateString = x + "-" + "10" + "-" + "01";
}
return dateString;
}
/**
* 功能：得到当前季度季末 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
* @return String
* @author pure
*/
public String thisSeasonEnd() {
String dateString = "";
x = localTime.get(Calendar.YEAR);
y = localTime.get(Calendar.MONTH) + 1;
if (y >= 1 && y <= 3) {
dateString = x + "-" + "03" + "-" + "31";
}
if (y >= 4 && y <= 6) {
dateString = x + "-" + "06" + "-" + "30";
}
if (y >= 7 && y <= 9) {
dateString = x + "-" + "09" + "-" + "30";
}
if (y >= 10 && y <= 12) {
dateString = x + "-" + "12" + "-" + "31";
}
return dateString;
}
/**
* 功能：得到当前年份年初 格式为：xxxx-yy-zz (eg: 2007-01-01)<br>
* @return String
* @author pure
*/
public String thisYear() {
x = localTime.get(Calendar.YEAR);
return x + "-01" + "-01";
}
/**
* 功能：得到当前年份年底 格式为：xxxx-yy-zz (eg: 2007-12-31)<br>
* @return String
* @author pure
*/
public String thisYearEnd() {
x = localTime.get(Calendar.YEAR);
return x + "-12" + "-31";
}
/**
* 功能：判断输入年份是否为闰年<br>
*
* @param year
* @return 是：true 否：false
* @author pure
*/
public boolean leapYear(int year) {
boolean leap;
if (year % 4 == 0) {
if (year % 100 == 0) {
if (year % 400 == 0) leap = true;
else leap = false;
}
else leap = true;
}
else leap = false;
return leap;
}
}