java util Date format SSSSSS if not microseconds what are the last 3 digits

Question

Just tested this code on both my Windows  8  workstation and an AIX       public static void main String   args            System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SSSSSS   format new Date              System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SSSSSS   format new Date              and got something similar to this as a result   2013-10-07 12 53 26 000905 2013-10-07 12 53 26 000906   Can someone please explain me what are the last digits  if not microseconds   Note  I interact with a DB2 database in which chronological data is stored using timed columns as TIMESTAMP with 6 digits AFTER the seconds i e  microseconds  IMO   But all those  timestamps  are created by requesting the following query   SELECT current timestamp as currenttimestamp FROM Table   values  1   temp   I wonder if  given the above results  I couldn t just use in my code new Date   instead of selecting the current timestamp from the database   Thanks   PS  I searched but found no relevant  answered  questions  like  Current time in microseconds in java or Get time with hour  minute  second  millisecond  microsecond

User · Answer

Use java sql Timestamp toString if you want to get fractional seconds in text representation  The difference betwen Timestamp from DB and Java Date is that DB precision is nanoseconds while Java Date precision is milliseconds

User · Answer

SSSSSS is microseconds  Let us say the time is 10 30 22  Seconds 22  and 10 30 22 1 would be 22 seconds and 1 10 of a second   Extending the same logic   10 32 22 000132 would be 22 seconds and 132 1 000 000 of a second  which is nothing but microseconds

User · Answer

From the documentation of SimpleDateFormat   Letter     Date or Time Component     Presentation     Examples   S          Millisecond                Number           978    So it is milliseconds  or 1 1000th of a second  You just format it with on 6 digits  so you add 3 extra leading zeroes     You can check it this way       Date d  new Date        System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss S   format d        System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SS   format d        System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SSS   format d        System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SSSS   format d        System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SSSSS   format d        System out println new SimpleDateFormat  yyyy-MM-dd HH mm ss SSSSSS   format d      Output   2013-10-07 12 13 27 132 2013-10-07 12 13 27 132 2013-10-07 12 13 27 132 2013-10-07 12 13 27 0132 2013-10-07 12 13 27 00132 2013-10-07 12 13 27 000132    Ideone fiddle

User · Answer

tl dr  Instant now           toString         2018-02-02T00 28 02 487114Z   Instant parse       2018-02-02T00 28 02 487114Z      java time  The accepted Answer by ppeterka is correct  Your abuse of the formatting pattern results in an erroneous display of data  while the internal value is always limited milliseconds   The troublesome SimpleDateFormat and Date classes you are using are now legacy  supplanted by the java time classes  The java time classes handle nanoseconds resolution  much finer than the milliseconds limit of the legacy classes   The equivalent to java util Date is  java time Instant  You can even convert between them using new methods added to the old classes   Instant instant   myJavaUtilDate toInstant       The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds  up to nine  9  digits of a decimal fraction     Capture the current moment in UTC  Java 8 captures the current moment in milliseconds  while a new Clock implementation in Java 9 captures the moment in finer granularity  typically microseconds though it depends on the capabilities of your computer hardware clock  amp  OS  amp  JVM implementation   Instant instant   Instant now       Generate a String in standard ISO 8601 format   String output   instant toString          2018-02-02T00 28 02 487114Z   To generate strings in other formats  search Stack Overflow for DateTimeFormatter  already covered many times   To adjust into a time zone other than UTC  use ZonedDateTime   ZonedDateTime zdt   instant atZone  ZoneId of   Pacific Auckland            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  Java 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 Java SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   Later versions of Android bundle implementations of the java time classes  For earlier Android  the ThreeTenABP project adapts ThreeTen-Backport  mentioned above   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

I used yet another trick to format date with 6-digit precision  microseconds    System out println      new SimpleDateFormat  yyyy-MM-dd HH mm ss    format microseconds 1000       String format   06d   microseconds 1000000      This technique can be extended further  to nanoseconds and up

[java] java.util.Date format SSSSSS: if not microseconds what are the last 3 digits?

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