思路：

先获得当前季度的开始和结束日期，在当前日期的基础上往前推3个月即上个季度的开始和结束日期

/** * @param flag true：开始日期；false：结束日期 * @return */ public static String getLastQuarterTime(boolean flag){ SimpleDateFormat shortSdf = new SimpleDateFormat("yyyy-MM-dd"); SimpleDateFormat longSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String resultDate=""; Date now = null; try { Calendar calendar = Calendar.getInstance(); int currentMonth = calendar.get(Calendar.MONTH) + 1; //true：开始日期；false：结束日期 if(flag){ if (currentMonth >= 1 && currentMonth <= 3) calendar.set(Calendar.MONTH, 0); else if (currentMonth >= 4 && currentMonth <= 6) calendar.set(Calendar.MONTH, 3); else if (currentMonth >= 7 && currentMonth <= 9) calendar.set(Calendar.MONTH, 6); else if (currentMonth >= 10 && currentMonth <= 12) calendar.set(Calendar.MONTH, 9); calendar.set(Calendar.DATE, 1); now = longSdf.parse(shortSdf.format(calendar.getTime()) + " 00:00:00"); }else{ if (currentMonth >= 1 && currentMonth <= 3) { calendar.set(Calendar.MONTH, 2); calendar.set(Calendar.DATE, 31); } else if (currentMonth >= 4 && currentMonth <= 6) { calendar.set(Calendar.MONTH, 5); calendar.set(Calendar.DATE, 30); } else if (currentMonth >= 7 && currentMonth <= 9) { calendar.set(Calendar.MONTH, 8); calendar.set(Calendar.DATE, 30); } else if (currentMonth >= 10 && currentMonth <= 12) { calendar.set(Calendar.MONTH, 11); calendar.set(Calendar.DATE, 31); } now = longSdf.parse(shortSdf.format(calendar.getTime()) + " 23:59:59"); } calendar.setTime(now);// 设置日期 calendar.add(Calendar.MONTH, -3); resultDate = longSdf.format(calendar.getTime()); } catch (Exception e) { ; } return resultDate; }