优化时间格式查询：处理yyyyMM与yyyyMMdd类型的上一个月数据检索问题

传参类型 String

yyyy-MM

public String lastDate (String date){SimpleDateFormat sdf &＃61; new SimpleDateFormat("yyyy-MM");String lastDate &＃61; "";try {Date currentDate &＃61; sdf.parse(date);Calendar calendar &＃61; Calendar.getInstance();calendar.setTime(currentDate);calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1);lastDate &＃61; sdf.format(calendar.getTime());} catch (Exception e){e.printStackTrace();}return lastDate;
}

yyyy-MM-dd

DateTimeFormatter fmt &＃61; DateTimeFormatter.ofPattern("yyyy-MM-dd");
String lastDate &＃61; LocalDate.parse(startDate, fmt).minusMonths(1).format(fmt);