java中判断是否是今天，返回时间的字符串_java判断是当天返回时间不是则加上日期

private String getDateType(Date dateTime){
        Date nowtime = new Date();
        SimpleDateFormat sf = new SimpleDateFormat(DateUtils.PATTERN_2);
        SimpleDateFormat sd = new SimpleDateFormat(DateUtils.PATTERN_7);
        SimpleDateFormat sdf = new SimpleDateFormat(DateUtils.PATTERN_6);
        String day = sf.format(dateTime);
        String now = sf.format(nowtime);
        if (now.equals(day)){
            sd.format(dateTime);
            return "今天 "+sd.format(dateTime);
        }
        return sdf.format(dateTime);
    }
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用到的时间字符串

public class DateUtils {

    //每一天的毫秒数
    private static final long MS_EVERY_DAY = 1000 * 60 * 60 * 24;

    /**
     * 例：2021-02-01
     */
    public static String FORMAT_SHORT = "yyyy-MM-dd";
    public static String PATTERN_1 = "yyyy-MM-dd HH:mm";
    public static String PATTERN_2 = "yyyy/MM/dd HH:mm";
    public static String PATTERN_3 = "yyyy-MM-dd";
    public static String PATTERN_4 = "yyyy/MM/dd";
    public static String PATTERN_5 = "yyyy-MM";
    public static String PATTERN_6 = "HH:mm:ss";
    public static String PATTERN_7 = "HH:mm";

  public static void main(String[] args) {
        Integer integer = compareMonth(DateUtils.addMonth(new Date(), -5), new Date());
        System.out.println(integer);
    }


}
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