How can I get the count of milliseconds since midnight for the current?

StackOverflow https://stackoverflow.com/questions/11785200

  •  24-06-2021
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Question

Note, I do NOT want millis from epoch. I want the number of milliseconds currently on the clock.

So for example, I have this bit of code.

Date date2 = new Date(); 
Long time2 = (long) (((((date2.getHours() * 60) + date2.getMinutes())* 60 ) + date2.getSeconds()) * 1000);

Is there a way to get milliseconds with date? Is there another way to do this?

Note: System.currentTimeMillis() gives me millis from epoch which is not what I'm looking for.

Was it helpful?

Solution

Do you mean?

long millis = System.currentTimeMillis() % 1000;

BTW Windows doesn't allow timetravel to 1969

C:\> date
Enter the new date: (dd-mm-yy) 2/8/1969
The system cannot accept the date entered.

OTHER TIPS

Use Calendar

Calendar.getInstance().get(Calendar.MILLISECOND);

or 

Calendar c=Calendar.getInstance();
c.setTime(new Date()); /* whatever*/
//c.setTimeZone(...); if necessary
c.get(Calendar.MILLISECOND);

In practise though I think it will nearly always equal System.currentTimeMillis()%1000; unless someone has leap-milliseconds or some calendar is defined with an epoch not on a second-boundary. 

Calendar.getInstance().get(Calendar.MILLISECOND);

tl;dr

You ask for the fraction of a second of the current time as a number of milliseconds (not count from epoch).

Instant.now()                               // Get current moment in UTC, then…
       .get( ChronoField.MILLI_OF_SECOND )  // interrogate a `TemporalField`.

2017-04-25T03:01:14.113Z → 113

  1. Get the fractional second in nanoseconds (billions).
  2. Divide by a thousand to truncate to milliseconds (thousands).

See this code run live at IdeOne.com.

Using java.time

The modern way is with the java.time classes.

Capture the current moment in UTC.

Instant.now()

Use the Instant.get method to interrogate for the value of a TemporalField. In our case, the TemporalField we want is ChronoField.MILLI_OF_SECOND.

int millis = Instant.now().get( ChronoField.MILLI_OF_SECOND ) ;  // Get current moment in UTC, then interrogate a `TemporalField`.

Or do the math yourself.

More likely you are asking this for a specific time zone. The fraction of a second is likely to be the same as with Instant but there are so many anomalies with time zones, I hesitate to make that assumption.

ZonedDateTime zdt = ZonedDateTime.now( ZoneId.of( "America/Montreal" ) ) ;

Interrogate for the fractional second. The Question asked for milliseconds, but java.time classes use a finer resolution of nanoseconds. That means the number of nanoseconds will range from from 0 to 999,999,999. 

long nanosFractionOfSecond = zdt.getNano();

If you truly want milliseconds, truncate the finer data by dividing by one million. For example, a half second is 500,000,000 nanoseconds and also is 500 milliseconds.

long millis = ( nanosFractionOfSecond / 1_000_000L ) ;  // Truncate nanoseconds to milliseconds, by a factor of one million.

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

Where to obtain the java.time classes?

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

I tried a few ones above but they seem to reset @ 1000

This one definately works, and should also take year into consideration

long millisStart = Calendar.getInstance().getTimeInMillis();

and then do the same for end time if needed.

  1. long timeNow = System.currentTimeMillis();
  2. System.out.println(new Date(timeNow));

Fri Apr 04 14:27:05 PDT 2014

Joda-Time

I think you can use Joda-Time to do this. Take a look at the DateTime class and its getMillisOfSecond method. Something like

int ms = new DateTime().getMillisOfSecond() ;

In Java 8 you can simply do

ZonedDateTime.now().toInstant().toEpochMilli()

returns : the number of milliseconds since the epoch of 1970-01-01T00:00:00Z

I did the test using java 8 It wont matter the order the builder always takes 0 milliseconds and the concat between 26 and 33 milliseconds under and iteration of a 1000 concatenation

Hope it helps try it with your ide

public void count() {

        String result = "";

        StringBuilder builder = new StringBuilder();

        long millis1 = System.currentTimeMillis(),
            millis2;

        for (int i = 0; i < 1000; i++) {
            builder.append("hello world this is the concat vs builder test enjoy");
        }

        millis2 = System.currentTimeMillis();

        System.out.println("Diff: " + (millis2 - millis1));

        millis1 = System.currentTimeMillis();

        for (int i = 0; i < 1000; i++) {
            result += "hello world this is the concat vs builder test enjoy";
        }

        millis2 = System.currentTimeMillis();

        System.out.println("Diff: " + (millis2 - millis1));
    }

Java 8:

LocalDateTime toDate = LocalDateTime.now();
LocalDateTime fromDate = LocalDateTime.of(toDate.getYear(), toDate.getMonth(), 
toDate.getDayOfMonth(), 0, 0, 0);
long millis = ChronoUnit.MILLIS.between(fromDate, toDate);

You can use java.util.Calendar class to get time in milliseconds. Example:

Calendar cal = Calendar.getInstance();
int milliSec = cal.get(Calendar.MILLISECOND);
// print milliSec

java.util.Date date = cal.getTime();
System.out.println("Output: " +  new SimpleDateFormat("yyyy/MM/dd-HH:mm:ss:SSS").format(date));
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