时间工具类

public class DateUtils extends org.apache.commons.lang3.time.DateUtils
{
public static String YYYY = “yyyy”;

public static String YYYY_MM = "yyyy-MM";

public static String YYYY_MM_DD = "yyyy-MM-dd";

public static String YYYYMMDD = "yyyyMMdd";

public static String YYYYMMDD_HH_MM_SS = "yyyyMMdd HH:mm:ss";

public static String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

public static String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

private static String[] parsePatterns = {
        "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM", 
        "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
        "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};

/**
 * 获取当前Date型日期
 * 
 * @return Date() 当前日期
 */
public static Date getNowDate()
{
    return new Date();
}

/**
 * 获取当前日期, 默认格式为yyyy-MM-dd
 * 
 * @return String
 */
public static String getDate()
{
    return dateTimeNow(YYYY_MM_DD);
}

public static final String getTime()
{
    return dateTimeNow(YYYY_MM_DD_HH_MM_SS);
}

public static final String dateTimeNow()
{
    return dateTimeNow(YYYYMMDDHHMMSS);
}

public static final String dateTimeNow(final String format)
{
    return parseDateToStr(format, new Date());
}

public static final String dateTime(final Date date)
{
    return parseDateToStr(YYYY_MM_DD, date);
}

public static final String parseDateToStr(final String format, final Date date)
{
    return new SimpleDateFormat(format).format(date);
}

public static final Date dateTime(final String format, final String ts)
{
    try
    {
        return new SimpleDateFormat(format).parse(ts);
    }
    catch (ParseException e)
    {
        throw new RuntimeException(e);
    }
}

/**
 * 日期路径 即年/月/日 如2018/08/08
 */
public static final String datePath()
{
    Date now = new Date();
    return DateFormatUtils.format(now, "yyyy/MM/dd");
}

/**
 * 日期路径 即年/月/日 如20180808
 */
public static final String dateTime()
{
    Date now = new Date();
    return DateFormatUtils.format(now, "yyyyMMdd");
}

/**
 * 日期型字符串转化为日期 格式
 */
public static Date parseDate(Object str)
{
    if (str == null)
    {
        return null;
    }
    try
    {
        return parseDate(str.toString(), parsePatterns);
    }
    catch (ParseException e)
    {
        return null;
    }
}

/**
 * 获取服务器启动时间
 */
public static Date getServerStartDate()
{
    long time = ManagementFactory.getRuntimeMXBean().getStartTime();
    return new Date(time);
}

/**
 * 计算相差天数
 */
public static int differentDaysByMillisecond(Date date1, Date date2)
{
    return Math.abs((int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24)));
}

/**
 * 计算相差天数
 */
public static int subtraction(Date date1, Date date2)
{
    return (int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24));
}

/**
 * 计算两个时间差
 */
public static String getDatePoor(Date endDate, Date nowDate)
{
    long nd = 1000 * 24 * 60 * 60;
    long nh = 1000 * 60 * 60;
    long nm = 1000 * 60;
    // long ns = 1000;
    // 获得两个时间的毫秒时间差异
    long diff = endDate.getTime() - nowDate.getTime();
    // 计算差多少天
    long day = diff / nd;
    // 计算差多少小时
    long hour = diff % nd / nh;
    // 计算差多少分钟
    long min = diff % nd % nh / nm;
    // 计算差多少秒//输出结果
    // long sec = diff % nd % nh % nm / ns;
    return day + "天" + hour + "小时" + min + "分钟";
}

/**
 * 增加 LocalDateTime ==> Date
 */
public static Date toDate(LocalDateTime temporalAccessor)
{
    ZonedDateTime zdt = temporalAccessor.atZone(ZoneId.systemDefault());
    return Date.from(zdt.toInstant());
}

/**
 * 增加 LocalDate ==> Date
 */
public static Date toDate(LocalDate temporalAccessor)
{
    LocalDateTime localDateTime = LocalDateTime.of(temporalAccessor, LocalTime.of(0, 0, 0));
    ZonedDateTime zdt = localDateTime.atZone(ZoneId.systemDefault());
    return Date.from(zdt.toInstant());
}

}