Question

我正在尝试使用秒的双倍值来转换为自定义时间格式。我已经尝试过SimpleDate Format，但这不起作用......

我有这种格式的双精度值：407.33386569554585（代表407秒和333毫秒......）。

我需要这种格式：HH/MM/SS.MS

我该怎么做？

提前致谢！

Answer 1

乘以1,000，然后转换为long并使用它构建日期。

Date date = new Date((long)(dubTime*1000));

从这里开始，您可以使用SimpleDateFormat制作您喜欢的字符串。

String formattedDate = new SimpleDateFormat("HH/mm/ss.SSS").format(date);

Answer 2

以Java 8样式（如果您想避免日期弃用警告）：

DateTimeFormatter formatter =
    DateTimeFormatter.ofPattern("HH/mm/ss.SSS").withZone(ZoneId.of("UTC"));
Instant instant = Instant.ofEpochMilli((long)(dubTime*1000));
return formatter.format(instant);

Answer 3

以下是我们使用的一些您可以轻松适应的代码。下面的实现将打印一个值为00days 00h00m00s00ms：

public final static long ONE_MILLISECOND = 1;
public final static long MILLISECONDS_IN_A_SECOND = 1000;

public final static long ONE_SECOND = 1000;
public final static long SECONDS_IN_A_MINUTE = 60;

public final static long ONE_MINUTE = ONE_SECOND * 60;
public final static long MINUTES_IN_AN_HOUR = 60;

public final static long ONE_HOUR = ONE_MINUTE * 60;
public final static long HOURS_IN_A_DAY = 24;
public final static long ONE_DAY = ONE_HOUR * 24;
public final static long DAYS_IN_A_YEAR = 365;

public String formatHMSM(Number n) {


    String res = "";
    if (n != null) {
        long duration = n.longValue();

        duration /= ONE_MILLISECOND;
        int milliseconds = (int) (duration % MILLISECONDS_IN_A_SECOND);
        duration /= ONE_SECOND;
        int seconds = (int) (duration % SECONDS_IN_A_MINUTE);
        duration /= SECONDS_IN_A_MINUTE;
        int minutes = (int) (duration % MINUTES_IN_AN_HOUR);
        duration /= MINUTES_IN_AN_HOUR;
        int hours = (int) (duration % HOURS_IN_A_DAY);
        duration /= HOURS_IN_A_DAY;
        int days = (int) (duration % DAYS_IN_A_YEAR);
        duration /= DAYS_IN_A_YEAR;
        int years = (int) (duration);
        if (days == 0) {
            res = String.format("%02dh%02dm%02ds%03dms", hours, minutes, seconds, milliseconds);
        } else if (years == 0) {
            res = String.format("%ddays %02dh%02dm%02ds%03dms", days, hours, minutes, seconds, milliseconds);
        } else {
            res = String.format("%dyrs %ddays %02dh%02dm%02ds", years, days, hours, minutes, seconds);
        }
    }
    return res;

}

Answer 4

只是为了补充蒂姆的答案：无论你的时区如何，都要获得正确的字符串，只需使用SimpleDateFormat.setTimeZone()：

DateFormat dateFormat = new SimpleDateFormat("HH/mm/ss.SSS");
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
// ...
double doubleTime=1000.0;
Date date = new Date((long) (doubleTime*1000));
String formattedTime = dateFormat.format(date);

请务必咨询DateFormat.setTimeZone javadoc，以了解timeZone何时可能被覆盖。

自定义字符串格式的秒数

4 个答案: