判断日期是否在当前月份的月初(月中之前)

                    String endDate = "2020-11-11";
                    DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                    Calendar c = Calendar.getInstance();
                    try {
                        c.setTime(format.parse(endDate));
                    } catch (ParseException e) {
                        Logger.error(e.getMessage());
                    }
                    // 当前月最后一天
                    int maxDay = c.getActualMaximum(Calendar.DATE);
                    
                    c.add(Calendar.DATE, maxDay/2);
                    int day = c.get(Calendar.DAY_OF_MONTH);
                    if (day < maxDay && day > maxDay/2) { // 月初
                        // 取上个月的最后一天
                        c.add(Calendar.MONTH, -1);
                        c.set(Calendar.DATE, c.getActualMaximum(Calendar.DATE));
                        
                        String format2 = format.format(c.getTime());
                        enddate = new UFLiteralDate(format2.toString());
                    } else {
                        enddate = new UFLiteralDate(endDate.toString());
                    }