date和localdatetime转换_date和localdatetime

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 /**
     * Date转换成LocalDate
     * @param date
     * @return
     */
    public static LocalDate date2LocalDate(Date date) {
        if(null == date) {
            return null;
        }
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
    }

    /**
     * LocalDate转换成Date
     * @param localDate
     * @return
     */
    public static Date localDate2Date(LocalDate localDate) {
        if(null == localDate) {
            return null;
        }
        ZonedDateTime zonedDateTime = localDate.atStartOfDay(ZoneId.systemDefault());
        return Date.from(zonedDateTime.toInstant());
    }

    //获取月第一天
    public static Date getStartDayOfMonth(String date) {
        LocalDate now = LocalDate.parse(date);
        return getStartDayOfMonth(now);
    }

    public static Date getStartDayOfMonth(LocalDate date) {
        LocalDate now = date.with(TemporalAdjusters.firstDayOfMonth());
        return localDate2Date(now);
    }

    public static Date getStartDayOfMonth() {
        return getStartDayOfMonth(LocalDate.now());
    }


    //获取月最后一天
    public static Date getEndDayOfMonth(String date) {
        LocalDate localDate = LocalDate.parse(date);
        return getEndDayOfMonth(localDate);
    }

    public static Date getEndDayOfMonth(Date date) {
        return getEndDayOfMonth(date2LocalDate(date));
    }

    public static Date getEndDayOfMonth(LocalDate date) {
        LocalDate now = date.with(TemporalAdjusters.lastDayOfMonth());
        Date.from(now.atStartOfDay(ZoneId.systemDefault()).plusDays(1L).minusNanos(1L).toInstant());
        return localDate2Date(now);
    }

    public static Date getEndDayOfMonth() {
        return getEndDayOfMonth(LocalDate.now());
    }


    //获取周第一天
    public static Date getStartDayOfWeek(String date) {
        LocalDate now = LocalDate.parse(date);
        return getStartDayOfWeek(now);
    }

    public static Date getStartDayOfWeek(TemporalAccessor date) {
        TemporalField fieldISO = WeekFields.of(Locale.CHINA).dayOfWeek();
        LocalDate localDate = LocalDate.from(date);
        localDate = localDate.with(fieldISO, 1);
        return localDate2Date(localDate);
    }

    //获取周最后一天
    public static Date getEndDayOfWeek(String date) {
        LocalDate localDate = LocalDate.parse(date);
        return getEndDayOfWeek(localDate);
    }

    public static Date getEndDayOfWeek(TemporalAccessor date) {
        TemporalField fieldISO = WeekFields.of(Locale.CHINA).dayOfWeek();
        LocalDate localDate = LocalDate.from(date);
        localDate = localDate.with(fieldISO, 7);
        return Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).plusDays(1L).minusNanos(1L).toInstant());
    }

    //一天的开始
    public static LocalDateTime getStartOfDay(LocalDate date) {
        LocalDateTime time = LocalDateTime.of(date, LocalTime.MIN);
        return time;
    }

    public static LocalDateTime getStartOfDay() {
        return getStartOfDay(LocalDate.now());
    }

    /**
     * 一天的结束
     */
    public static LocalDateTime getEndOfDay(LocalDate date) {
        LocalDateTime time = LocalDateTime.of(date, LocalTime.MAX);
        return time;
    }

    public static LocalDateTime getEndOfDay() {
        return getEndOfDay(LocalDate.now());
    }
    //获取下个月的某一天
    public static LocalDate getNextMonth(String date) {
        LocalDate now = LocalDate.parse(date);
        return now.minusMonths(-1);
    }
    //获取上个月的某一天
    public static LocalDate getLastMonth(String date) {
        LocalDate now = LocalDate.parse(date);
        return now.minusMonths(1);
    }