Java后台如何处理日期参数格式

DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd");
LocalDateTime time = LocalDateTime.now();
mTime = df.format(time);

 <if test="null != time and '' != time ">
         and DATE_FORMAT(entity.time, '%Y-%m-%d' )=#{time }
 </if>

 QueryWrapper<XXXEntity> queryWrapper = new QueryWrapper<>();
 queryWrapper.eq("date_format (meeting_time,'%Y-%m-%d')", time);
 List<XXXEntity> xentity= xxxMapper.selectList(queryWrapper);

SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd EE HH:mm”);
String startTime = sdf.format(meetings.getMeetingTime());
SimpleDateFormat sdf1 = new SimpleDateFormat(“HH:mm”);
String endTime = sdf1.format(meetings.getMeetingEndtime());
System.out.println(startTime);
System.out.println(endTime);
System.out.println(startTime+"-"+endTime);

/**
 * 交易时间
 */
@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date orderTime;

public class DateUtils {
	/** 时间格式(yyyy-MM-dd) */
	public final static String DATE_PATTERN = "yyyy-MM-dd";
	/** 时间格式(yyyy-MM-dd HH:mm:ss) */
	public final static String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
	public static String format(Date date) {
        return format(date, DATE_PATTERN);
    }
    public static String format(Date date, String pattern) {
        if(date != null){
            SimpleDateFormat df = new SimpleDateFormat(pattern);
            return df.format(date);
        }
        return null;
    }
}