Java jdk 8 带 T的时间字符串的格式化问题

Posted 2022-06-23 请叫我大师兄_

比如给的字符串的时间是 "2021-10-01T04:37:34,703"，给转成秒或者毫秒。

    /**
     * 8小时的秒数
     */
    private static final int OFFSET = 8 * 60 * 60;
    private static final ZoneId ZONE_ID = ZoneOffset.systemDefault();
    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss,SSS");

    @Test
    public void test() 
        String string = "2021-10-01T04:37:34,703";
        LocalDateTime localDateTime = LocalDateTime.parse(string, FORMATTER);
        long s = localDateTime.atZone(ZONE_ID).toEpochSecond();
        long ms = localDateTime.toInstant(ZoneOffset.ofTotalSeconds(OFFSET)).toEpochMilli();
        System.out.println(s);
        System.out.println(ms);
    

实际运行结果：

1633034254
1633034254703