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

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

User · Accepted Answer

Do you mean   long millis   System currentTimeMillis     1000      BTW Windows doesn t allow timetravel to 1969  C   gt  date Enter the new date   dd-mm-yy  2 8 1969 The system cannot accept the date entered

User · Answer

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

User · Answer

long timeNow   System currentTimeMillis      System out println new Date timeNow         Fri Apr 04 14 27 05 PDT 2014

User · Answer

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

User · Answer

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  quot Output   quot     new SimpleDateFormat  quot yyyy MM dd-HH mm ss SSS quot   format date

User · Answer

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  lt  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  lt  1000  i                  result     hello world this is the concat vs builder test enjoy                      millis2   System currentTimeMillis             System out println  Diff       millis2 - millis1

User · Answer

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    Get the fractional second in nanoseconds  billions   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   amp  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     Java SE 8 and SE 9 and later   Built-in   Part of the standard Java API with a bundled implementation  Java 9 adds some minor features and fixes   Java SE 6 and SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   The ThreeTenABP project adapts ThreeTen-Backport  mentioned above  for Android specifically  See How to use ThreeTenABP        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

User · Answer

Calendar getInstance   get Calendar MILLISECOND

User · Answer

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

User · Answer

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

User · Answer

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

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

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