Milliseconds and nanoseconds in time format

Question

This is my code:

long currentTime = System.currentTimeMillis();
Date date = new Date(currentTime); // if you really have long
String result = new SimpleDateFormat("HH:mm:ss").format(date.getTime());

Is it possible to add milliseconds and nanoseconds to the date format ?

Please learn to use the [Javadoc](http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html). — fvu, Nov 28 '12 at 14:41
Also note the existence of microseconds. There are 1 000 000 nanoseconds in a millisecond. — John Dvorak, Nov 28 '12 at 14:45
Also note that system clocks can rarely measure in the nanosecond range. Even the miliseconds won't be accurate. — John Dvorak, Nov 28 '12 at 14:47
`java.util.Date` works internally with millis stored in a `long` type. So I am afraid there is no smaller fraction than millis for something dealing with `Date`. — Fabian Barney, Nov 28 '12 at 14:47

score 14 · Accepted Answer · answered Nov 28 '12 at 14:39

14

You can add milliseconds by adding SSS at the end, such as the format will be HH:mm:ss.SSS.

There is no reference in the SimpleDateFormat to nanoseconds. Usually System.nanoTime() is used for performance debugging and not for display purposes.

answered Nov 28 '12 at 14:39

Dan D.

32,246
5
63
79

PermGenError · Answer 2 · 2012-11-28T14:49:38.183

6

String result = new SimpleDateFormat("HH:mm:ss:SSS").format(date);

"HH:mm:ss:SSS" //SSS stands for milliseconds

Check SimpleDateFormat API for more info

edited Nov 28 '12 at 14:49

answered Nov 28 '12 at 14:38

PermGenError

45,977
8
87
106

1

You probably want SSS, not SS. These are milliseconds, not centi-seconds. – Dan D. Nov 28 '12 at 14:41
@Dan: `SS` works fine too, but millis between 10 and 99 won't have a leading 0. – Keppil Nov 28 '12 at 14:46
@GriffeyDog hmm, true, i tought `date` was Calender reference here :P – PermGenError Nov 28 '12 at 14:50

score 0 · Answer 3 · answered Mar 24 '14 at 12:56

String timeStamp = new SimpleDateFormat("dd:MM:yyyy_HH:mm:ss:SSS").format(Calendar.getInstance().getTime());
timeStamp = timeStamp + ":" + System.nanoTime();

This gave me output,

24:03:2014_18:24:09:890:2018826751601473

Milliseconds and nanoseconds in time format

3 Answers3

Linked

Related