public static String lastMonth(int allMonth) {
Date date = new Date();
int year=Integer.parseInt(new SimpleDateFormat("yyyy").format(date));
int month=Integer.parseInt(new SimpleDateFormat("MM").format(date))-allMonth;
int day=Integer.parseInt(new SimpleDateFormat("dd").format(date));
if(month <= 0){
int yearFlag = (month*(-1))/12 + 1;
int monthFlag = (month *(-1))%12;
year -= yearFlag;
month=monthFlag*(-1) +12;
}
else if(day>28){
if(month==2){
if(year%400==0||(year %4==0&&year%100!=0)){
day=29;
}else day=28;
}else if((month==4||month==6||month==9||month==11)&&day==31){
day=30;
}
}
String y = year+"";String m ="";String d ="";
if(month<10) m = "0"+month;
else m=month+"";
if(day<10) d = "0"+day;
else d = day+"";
return y+m+d;
}
计算当前日期n月前的日期
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转载自blog.csdn.net/gaofenglxx/article/details/60139953
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