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工具类:
public static Date addYearMonth (Date dt, int month) {
Calendar c = Calendar.getInstance();
c.setTime(dt);
c.add(Calendar.MONTH, month); //这里改 紫色DATE , YEAR.
return c.getTime();
}
eg: //获取上个月分
Date currentDate = 工具类.addYearMonth(获取系统当前时间, -1);