时间工具类：获取指定年、季、月的开始和结束时间

public class DateUtils {

private
static SimpleDateFormat sf = new
SimpleDateFormat("yyyy-MM-dd");

public
static String getFirstDayOfMonth(int year, int month) {

Calendar cal = Calendar.getInstance();

cal.set(Calendar.YEAR, year);

cal.set(Calendar.MONTH, month - 1);

cal.set(Calendar.DAY_OF_MONTH,
cal.getMinimum(Calendar.DATE));

return sf.format(cal.getTime())+"
00:00:00";

}

public
static String getLastDayOfMonth(int year, int month) {

Calendar cal = Calendar.getInstance();

cal.set(Calendar.YEAR, year);

cal.set(Calendar.MONTH, month - 1);

cal.set(Calendar.DAY_OF_MONTH, 1);

int value =
cal.getActualMaximum(Calendar.DAY_OF_MONTH);

cal.set(Calendar.DAY_OF_MONTH, value);

return sf.format(cal.getTime())+"
23:59:59";

}

public
static String getFirstDayOfYear(int year){

Calendar calendar = Calendar.getInstance();

calendar.clear();

calendar.set(Calendar.YEAR, year);

Date currYearFirst = calendar.getTime();

return sf.format(currYearFirst)+" 00:00:00";

}

public
static String getLastDayOfYear(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 sf.format(currYearLast)+" 23:59:59";

}

public
static String getFirstDayOfSeason(int year, int season) {

if(season == 1){

return String.valueOf(year)+"-01-01
00:00:00";

}else if(season == 2){

return String.valueOf(year)+"-04-01
00:00:00";

}else if(season == 3){

return String.valueOf(year)+"-07-01
00:00:00";

}else{

return String.valueOf(year)+"-10-01
00:00:00";

}

}

public
static String getLastDayOfSeason(int year, int season) {

if(season == 1){

return String.valueOf(year)+"-03-31
23:59:59";

}else if(season == 2){

return String.valueOf(year)+"-06-30
23:59:59";

}else if(season == 3){

return String.valueOf(year)+"-09-30
23:59:59";

}else{

return String.valueOf(year)+"-12-31
23:59:59";

}

}

public
static void main(String[] args) {

String s = getFirstDayOfSeason(2013,2);

String e = getLastDayOfSeason(2013,2);

System.out.println(s);

System.out.println(e);

}

}