时间处理工具类

搜集整理比较常用的时间工具类，记录一下。

/**
 * LocalDateTime 转 时间
 */
public static String localDateTimeToDateTime(LocalDateTime localDateTime) {
    return DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(localDateTime);
}

/**
 * LocalDateTime 转 日期
 */
public static String localDateTimeToDate(LocalDateTime localDateTime) {
    return DateTimeFormatter.ofPattern("yyyy-MM-dd").format(localDateTime);
}

/**
 * 转时间戳
 */
public static String parseTimestamp(Date date) {
    SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS");
    return format.format(date);
}

/**
 * 转时间格式
 */
public static String parseYYYYMMDDHHMMSS(String date) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    return simpleDateFormat.format(date);
}

/**
 * Date转ISO8601
 */
public static String datetimeParseISO8601(Date date) {
    SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
    return iso8601DateFormat.format(date);
}

/**
 * iso8601转时间格式
 */
public static String iso8601ToDateTime(String date) {
    SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String d = "";
    try {
        d = simpleDateFormat.format(iso8601DateFormat.parse(date));
    } catch (ParseException e) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        e.printStackTrace(new PrintStream(bos));
        log.warn("--->时间转换异常：" + bos);
    }
    return d;
}

/**
 * iso8601（UTC）转时间格式
 *
 * @param date
 * @return
 */
public static String iso8601UTCToDateTime(String date) {
    SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String d = "";
    try {
        d = simpleDateFormat.format(iso8601DateFormat.parse(date));
    } catch (ParseException e) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        e.printStackTrace(new PrintStream(bos));
        log.warn("--->时间转换异常：" + bos);
    }
    return d;
}

/**
 * 时间转换
 */
public static String parseYMD(Date date) {
    SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
    return formatYMD.format(date);
}

/**
 * 将Date转String
 */
public static String dateFormatZh(Date date) {
    SimpleDateFormat simpleDateFormatZh = new SimpleDateFormat("yyyy年M月d日 HH:mm:ss");
    return simpleDateFormatZh.format(date);
}

/**
 * 将String转Date
 */
public static Date toDate(String date) {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date d = null;
    try {
        d = simpleDateFormat.parse(date);
    } catch (ParseException e) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        e.printStackTrace(new PrintStream(bos));
        log.warn("--->时间转换异常：" + " " + bos);
    }
    return d;
}

/**
 * 将Date转String
 */
public static String dateFormatMD(Date date) {
    SimpleDateFormat simpleDateFormatZhMin = new SimpleDateFormat("M月d日");
    return simpleDateFormatZhMin.format(date);
}

/**
 * 根据时间获取当月天数
 */
public static int getDayByMonth(String time) {
    int day;
    int year = Integer.parseInt(time.split("-")[0]);
    int month = Integer.parseInt(time.split("-")[1]);
    if (2 == month) {
        day = year % 4 == 0 ? 29 : 28;
    } else {
        if (month == 8 || month == 12) {
            day = 31;
        } else if (month == 9 || month == 11) {
            day = 30;
        } else {
            day = month % 2 == 0 ? 30 : 31;
        }
    }
    return day;
}

/**
 * 获取时间所在星期第几天
 */
public static int getDayOfWeek(String time) {
    LocalDate localDate = LocalDate.fromDateFields(CalendarUtils.toDate(time));
    return localDate.dayOfWeek().get();
}

/**
 * 获取时间所在月份第几天
 */
public static int getDayOfMonth(String time) {
    LocalDate localDate = LocalDate.fromDateFields(CalendarUtils.toDate(time));
    return localDate.dayOfMonth().get();
}

/**
 * 获取本周第一天
 */
public static String getFirstOfWeek() {
    SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.WEEK_OF_MONTH, 0);
    calendar.set(Calendar.DAY_OF_WEEK, 2);
    Date time = calendar.getTime();
    return formatYMD.format(time);
}

/**
 * 获取本周最后一天
 */
public static String getLastOfWeek() {
    SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMaximum(Calendar.DAY_OF_WEEK));
    calendar.add(Calendar.DAY_OF_WEEK, 1);
    Date time = calendar.getTime();
    return formatYMD.format(time);
}


/**
 * 获取时间所在星期的第一天
 *
 * @param time yyyy-MM-dd
 * @return
 */
public static String getFirstOfWeek(String time) throws ParseException {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
    time = time + " " + "23:59:59";
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(simpleDateFormat.parse(time));
    calendar.add(Calendar.WEEK_OF_MONTH, 0);
    calendar.set(Calendar.DAY_OF_WEEK, 2);
    Date date = calendar.getTime();
    return formatYMD.format(date);
}

/**
 * 获取时间所在星期的最后一天
 *
 * @param time yyyy-MM-dd
 * @return
 */
public static String getLastOfWeek(String time) throws ParseException {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
    time = time + " " + "00:00:00";
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(simpleDateFormat.parse(time));
    calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMaximum(Calendar.DAY_OF_WEEK));
    calendar.add(Calendar.DAY_OF_WEEK, 1);
    Date date = calendar.getTime();
    return formatYMD.format(date);
}

/**
 * 获取时间所在月份的第一天
 */
public static String getFirstDayOfMonth(String time) throws ParseException {
    String year = time.split("-")[0];
    String month = time.split("-")[1];
    return year + "-" + month + "-" + "01";
}


/**
 * 获取时间所在月份的最后一天
 */
public static String getLastDayOfMonth(String time) throws ParseException {
    String year = time.split("-")[0];
    String month = time.split("-")[1];
    int days = CalendarUtils.getDayByMonth(time);
    return year + "-" + month + "-" + days;
}

/**
 * 获取时间戳（UTC）
 *
 * @return
 */
public long getTimestamp() {
    return LocalDateTime.now().toEpochSecond(ZoneOffset.of("+8"));
}


/**
 * 指定日期x分钟以前的时间
 *
 * @param minutes      分钟
 * @param current_time 日期
 * @return
 */
public static Date getBefordDateTime(int minutes, String current_time) throws ParseException {
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String before_time = simpleDateFormat.format(CalendarUtils.toDate(current_time).getTime() - (long) minutes * 60 * 1000);
    return simpleDateFormat.parse(before_time);
}