Get time with hour, minute, second, millisecond, microsecond

Question

I have this code:

SimpleDateFormat sDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

I know that this code return hour, minute, second in the time. How i can get also the millisecond and microsecond??

When I published it users was fighting on it, it was -3 and then +1... Sometimes users reduce points just because they high rated if you know what i mean... — lolo, Jan 25 '12 at 19:26
Are you after generating a string (formatting) with microseconds or after parsing a string with microseconds into a date-time object? — Ole V.V., Feb 13 '23 at 11:45
For new readers to this question I strongly recommend that you don’t use `SimpoleDateFormat`. It’s a notorious troublemaker of a class. Use classes from [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/index.html). — Ole V.V., Feb 13 '23 at 17:20

score 7 · Accepted Answer · answered Jan 17 '12 at 10:11

7

You won't have microseconds, because a Date stores the number of milliseconds since Jan. 1 1970. For the milliseconds, use S, as documented in the javadoc.

answered Jan 17 '12 at 10:11

JB Nizet

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So, you think it is so obvious that there are not microsecond?? – lolo Jan 17 '12 at 10:19
It's not obvious, and that's why I explain it in my answer. It's pretty clear if you read the documentation, though. Did you read it? – JB Nizet Jan 17 '12 at 10:24
@lolo - Based on how it says "Millisecond" in the first table on the page that JB Nizet linked to? Yeah, I'd say so. – Dawood ibn Kareem Jan 17 '12 at 10:25
If there had been a way of getting microseconds via SimpleDateFormat, it would have been there, in that table. – Dawood ibn Kareem Jan 17 '12 at 10:39

score 6 · Answer 2 · answered Jan 17 '12 at 14:26

The only way to get micro-seconds is to parse the string yourself. Note: Date should be used to store micro-seconds, but you can use a long. (which you can also use for milli-seconds or nano-seconds)

private static final String YEARS_TO_MINUTES = "yyyy-MM-dd HH:mm";
private static final SimpleDateFormat YEARS_TO_MINUTES_SDF = new SimpleDateFormat(YEARS_TO_MINUTES);

public static long parseMicroSeconds(String text) throws ParseException {
    long timeMS;
    synchronized (YEARS_TO_MINUTES_SDF) {
        timeMS = YEARS_TO_MINUTES_SDF.parse(text.substring(0, YEARS_TO_MINUTES.length())).getTime();
    }
    long microSecs = 0;
    if (text.length() > YEARS_TO_MINUTES.length() + 1) {
        double secs = Double.parseDouble(text.substring(YEARS_TO_MINUTES.length() + 1));
        microSecs = (long) (secs * 1e6 + 0.5);
    }
    return timeMS * 1000 + microSecs;
}

public static String formatMicroSeconds(long timeMicroSeconds) {
    String dateTime;
    synchronized (YEARS_TO_MINUTES_SDF) {
        dateTime = YEARS_TO_MINUTES_SDF.format(new Date(timeMicroSeconds / 1000));
    }
    long secs = timeMicroSeconds % 60000000;
    return dateTime + String.format(":%09.6f", secs / 1e6);
}


public static void main(String... args) throws ParseException {
    String dateTime = "2011-01-17 19:27:59.999650";
    long timeUS = parseMicroSeconds(dateTime);
    for (int i = 0; i < 5; i++)
        System.out.println(formatMicroSeconds(timeUS += 175));
}

prints

2011-01-17 19:27:59.999825
2011-01-17 19:28:00.000000
2011-01-17 19:28:00.000175
2011-01-17 19:28:00.000350
2011-01-17 19:28:00.000525

You can do similarly if you need nano-timings.

Hi Peter, I understand this is off topic, but curious to know why YEARS_TO_MINUTES_SDF was synchronized. — Mahesh, Feb 20 '17 at 09:51
@Mahesh SImpleDateFormat is not thread safe. It usually works fine without synchronization, but every so often you will get a corrupt value as it has mutable fields. — Peter Lawrey, Feb 20 '17 at 09:52

score 3 · Answer 3 · answered Jan 17 '12 at 10:13

3

The best you can do is:

SimpleDateFormat sDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");

answered Jan 17 '12 at 10:13

ante

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score 1 · Answer 4 · edited Feb 13 '23 at 18:25

import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
public class MyClass
{
    public static void main(String args[]) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss:SSSSS");
        for(int i=0; i<=5;i++) {
            System.out.println("Class 1 : " + ZonedDateTime.now().format(formatter));
        }
    }
}

Example output:

Class 1 : 19:25:19:77336
Class 1 : 19:25:19:77483
Class 1 : 19:25:19:77487
Class 1 : 19:25:19:77490
Class 1 : 19:25:19:77493
Class 1 : 19:25:19:77496

score 1 · Answer 5 · answered Jan 17 '12 at 10:09

1

You can only show the millisecond: :SS.

answered Jan 17 '12 at 10:09

Bozho

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score 0 · Answer 6 · answered Jan 17 '12 at 10:11

0

Check the Java-doc of SimpleDateFormat, it tells : Millisecond : S

Microseconds are not available.

answered Jan 17 '12 at 10:11

Jerome L

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score 0 · Answer 7 · answered Jan 17 '12 at 10:13

0

This example gets millisecond. Microseconds isn't available.

Date someDate = sDate.parse(dateString);
Calendar c = Calendar.setTime(someDate);
int millisecond = c.get(Calendar.MILLISECOND);

answered Jan 17 '12 at 10:13

Buhake Sindi

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score 0 · Answer 8 · answered Jan 17 '12 at 10:16

0

Generally the milliseconds are given with capital s and in your case it will be yyyy-MM-dd HH:mm:ss:SSS. For more info refer to Customizing formats

answered Jan 17 '12 at 10:16

Sai Kalyan Kumar Akshinthala

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Get time with hour, minute, second, millisecond, microsecond

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