日期工具

public final class DateTimeUtils {
    public static final String PATTERN = "yyyy-MM-dd HH:mm:ss:SSS";
    
    // 日期转Str
    public static String date2Str(Date date) {
        Instant instant = date.toInstant();
        ZoneId zone = ZoneId.systemDefault();
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
        DateTimeFormatter format = DateTimeFormatter.ofPattern(PATTERN);
        String nowStr = localDateTime.format(format);
        return nowStr;
    }
    // 日期转字符串
    public static Date str2Date(String dateStr) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(PATTERN);
        LocalDateTime localDateTime = LocalDateTime.parse(dateStr, dateTimeFormatter);
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = localDateTime.atZone(zone).toInstant();
        Date date = Date.from(instant);
        return date;
    }
    // 当天日期
    public static String nowTimeStr() {
        return date2Str(new Date());
    }
    // 字符串日期转时间戳
    public static long getTimestamp(String dateStr) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(PATTERN);
        LocalDateTime localDateTime = LocalDateTime.parse(dateStr, dateTimeFormatter);
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = localDateTime.atZone(zone).toInstant();
        return instant.toEpochMilli();
    }
    /**
    * 获取当前毫秒数
    */
    public static Long toEpochMilli(LocalDateTime dateTime) {
        return dateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
    }
    /**
    * 判断是否为闰年
    */
    public static boolean isLeapYear(LocalDate localDate) {
        return localDate.isLeapYear();
    }
}