package com.dada.test;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* @author li_yueling
* @version 1.0 2011-03-25
*
*/
public class DateUtil {
/**
* 默认日期格式
*/
public static String DEFAULT_FORMAT = "yyyy-MM-dd";
/**
* 测试主方法
* @param args
*/
public static void main(String[] args) {
for(int i = 1951;i < 1960;i++){
System.out.println(formatDate(getYearFirst(i)));
System.out.println(formatDate(getYearLast(i)));
}
System.out.println(formatDate(getCurrYearFirst()));
System.out.println(formatDate(getCurrYearLast()));
}
/**
* 格式化日期
* @param date 日期对象
* @return String 日期字符串
*/
public static String formatDate(Date date){
SimpleDateFormat f = new SimpleDateFormat(DEFAULT_FORMAT);
String sDate = f.format(date);
return sDate;
}
/**
* 获取当年的第一天
* @param year
* @return
*/
public static Date getCurrYearFirst(){
Calendar currCal=Calendar.getInstance();
int currentYear = currCal.get(Calendar.YEAR);
return getYearFirst(currentYear);
}
/**
* 获取当年的最后一天
* @param year
* @return
*/
public static Date getCurrYearLast(){
Calendar currCal=Calendar.getInstance();
int currentYear = currCal.get(Calendar.YEAR);
return getYearLast(currentYear);
}
/**
* 获取某年第一天日期
* @param year 年份
* @return Date
*/
public static Date getYearFirst(int year){
Calendar calendar = Calendar.getInstance();
calendar.clear();
calendar.set(Calendar.YEAR, year);
Date currYearFirst = calendar.getTime();
return currYearFirst;
}
/**
* 获取某年最后一天日期
* @param year 年份
* @return Date
*/
public static Date getYearLast(int year){
Calendar calendar = Calendar.getInstance();
calendar.clear();
calendar.set(Calendar.YEAR, year);
calendar.roll(Calendar.DAY_OF_YEAR, -1);
Date currYearLast = calendar.getTime();
return currYearLast;
}
/**
* 返回指定日期的季度
*
* @param date
* @return
*/
private static int getQuarterOfYear(Date date) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
return calendar.get(Calendar.MONTH) / 3 + 1;
} }