DateUtil 工具处理类

public class DateUtil {
    private static final DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    /**
     * @return 当天的起始时间点
     */
    public static LocalDateTime initTimeOfCurrentDay() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MIN);
    }

    /**
     * 当天的　23:59:59
     * @return
     */
    public static LocalDateTime lastTimeOfCurrentDay() {
        return LocalDateTime.of(LocalDate.now(), LocalTime.MAX);
    }

    /**
     *
     * @param localDateTime
     * @return　指定时间点那天的零点
     */
    public static LocalDateTime initTimeOfDay(LocalDateTime localDateTime) {
        return LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.MIN);
    }

    /**
     *
     * @param localDateTime
     * @return　指定时间点那天的 23:59:59
     */
    public static LocalDateTime lastTimeOfDay(LocalDateTime localDateTime) {
        return LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.MAX);
    }

    /**
     * @param localDate 日期
     * @return 指定日期的起始时间点
     */
    public static LocalDateTime initTimeOfDay(LocalDate localDate) {
        return LocalDateTime.of(localDate, LocalTime.MIN);
    }

    /**
     * @param localDate 日期
     * @return 指定日期的最后时间点
     */
    public static LocalDateTime lastTimeOfDay(LocalDate localDate) {
        return LocalDateTime.of(localDate, LocalTime.MAX);
    }

    /**
     * LocalDateTime 转换成 java.util.Date
     *
     * @param localDateTime 新时间
     * @return 旧时间
     */
    public static Date localDateTime2Date(LocalDateTime localDateTime) {
        Instant instant = localDateTime.atZone(ZoneId.systemDefault()).toInstant();
        return Date.from(instant);
    }

    /**
     * java.util.Date 转换成 LocalDateTime
     *
     * @param date 旧时间
     * @return 新时间
     */
    public static LocalDateTime date2LocalDateTime(Date date) {
        Instant instant = Instant.ofEpochMilli(date.getTime());
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
        return localDateTime;
    }

    /**
     * 毫秒时间戳转换成 LocalDateTime
     *
     * @param timeStampMill unxi timestamp millisecond
     * @return 时间
     */
    public static LocalDateTime millTimeStamp2LocalDateTime(Long timeStampMill) {
        return LocalDateTime.ofInstant(Instant.ofEpochMilli(timeStampMill), ZoneId.systemDefault());
    }

    /**
     * 秒时间戳转换成 LocalDateTime
     *
     * @param timeStampSecond
     * @return
     */
    public static LocalDateTime secondTimeStamp2LocalDateTime(Long timeStampSecond) {
        return LocalDateTime.ofInstant(Instant.ofEpochSecond(timeStampSecond), ZoneId.systemDefault());
    }

    /**
     * 秒时间戳 转成 LocalDate
     *
     * @param timeStampSecond
     * @return
     */
    public static LocalDate timeStamp2LocalDate(Long timeStampSecond) {
        ZonedDateTime zdt = Instant.ofEpochSecond(timeStampSecond).atZone(ZoneId.systemDefault());
        return zdt.toLocalDate();
    }

    /**
     * @param localDateTime 待格式化的日期
     * @param pattern       日期格式 yyyy-MM-dd HH:mm:ss
     * @return 格式化后的日期
     */
    public static String formatDate(LocalDateTime localDateTime, String pattern) {
        assert localDateTime != null;
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        return localDateTime.format(formatter);
    }

    public static Date formatDate(String date, String pattern) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        //thread safe
        LocalDateTime localDateTime = LocalDateTime.parse(date, formatter);
        return localDateTime2Date(localDateTime);
    }

    public static String formatDate(Long timeStampSecond, String pattern) {
        LocalDateTime localDateTime = secondTimeStamp2LocalDateTime(timeStampSecond);
        //"yyyy-MM-dd HH:mm:ss"
        return formatDate(localDateTime, pattern);
    }

    public static LocalDateTime formatLocalDateTime(String date, String pattern) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        return LocalDateTime.parse(date, formatter);
    }

    public static LocalDate formatLocalDate(String date, String pattern) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        return LocalDate.parse(date, formatter);
    }

    public static LocalTime formatLocalTime(String time, String pattern) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        return LocalTime.parse(time, formatter);
    }


    /**
     * Date 类型的对象 转换 成字符串日期格式
     *
     * @param date    Date 类型的对象
     * @param pattern "yyyy-MM-dd HH:mm:ss"
     * @return
     */
    public static String date2String(Date date, String pattern) {
        LocalDateTime tmp = date2LocalDateTime(date);
        return formatDate(tmp, pattern);
    }

    /**
     * 将 LocalDateTime 对象转化成 Long unix 时间戳
     *
     * @param localDateTime
     * @return
     */
    public static Long localDateTime2Long(LocalDateTime localDateTime) {
        return localDateTime.atZone(ZoneId.systemDefault()).toEpochSecond();
    }


    public static String localDateTime2String(LocalDateTime localDateTime) {
        return df.format(localDateTime);
    }

    /**
     *
     * @param localDate
     * @param pattern yyyy-MM-dd 或者 yyyyMMdd
     * @return
     */
    public static String localDate2String(LocalDate localDate, String pattern) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        return localDate.format(formatter);
    }
}