public class Test {
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
public static void main(String[] args)
{
int year= 2013;
int m=1;//月份计数
while (m<13)
{
int month=m;
Calendar cal=Calendar.getInstance();//获得当前日期对象
cal.clear();//清除信息
cal.set(Calendar.YEAR,year);
cal.set(Calendar.MONTH,month-1);//1月从0开始
cal.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
