Convert a date format in epoch

Question

I have a string with a date format such as   Jun 13 2003 23 11 52 454 UTC   containing millisec    which I want to convert in epoch   Is there an utility in Java I can use to do this conversion

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tl dr  ZonedDateTime parse                            Jun 13 2003 23 11 52 454 UTC                             DateTimeFormatter ofPattern    MMM d uuuu HH mm ss SSS z                                          toInstant                  toEpochMilli        1055545912454   java time  This Answer expands on the Answer by Lockni   DateTimeFormatter  First define a formatting pattern to match your input string by creating a DateTimeFormatter object   String input    Jun 13 2003 23 11 52 454 UTC   DateTimeFormatter f   DateTimeFormatter ofPattern    MMM d uuuu HH mm ss SSS z       ZonedDateTime  Parse the string as a ZonedDateTime  You can think of that class as    Instant   ZoneId     ZonedDateTime zdt   ZonedDateTime parse    Jun 13 2003 23 11 52 454 UTC    f         zdt toString    2003-06-13T23 11 52 454Z UTC      Count-from-epoch  I do not recommend tracking date-time values as a count-from-epoch  Doing so makes debugging tricky as humans cannot discern a meaningful date-time from a number so invalid unexpected values may slip by  Also such counts are ambiguous  in granularity  whole seconds  milli  micro  nano  etc   and in epoch  at least two dozen in by various computer systems     But if you insist you can get a count of milliseconds from the epoch of first moment of 1970 in UTC  1970-01-01T00 00 00  through the Instant class  Be aware this means data-loss as you are truncating any nanoseconds to milliseconds   Instant instant   zdt toInstant          instant toString    2003-06-13T23 11 52 454Z   long millisSinceEpoch   instant toEpochMilli           1055545912454     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   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   You may exchange java time objects directly with your database  Use a JDBC driver compliant with JDBC 4 2 or later  No need for strings  no need for java sql   classes   Where to obtain the java time classes     Java SE 8  Java SE 9  Java SE 10  Java SE 11  and later  - 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   Most 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   lt 26   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

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You can also use the new Java 8 API  import java time ZonedDateTime  import java time format DateTimeFormatter   public class StackoverflowTest      public static void main String args             String strDate    Jun 13 2003 23 11 52 454 UTC           DateTimeFormatter dtf    DateTimeFormatter ofPattern  MMM dd yyyy HH mm ss SSS zzz            ZonedDateTime     zdt    ZonedDateTime parse strDate dtf                   System out println zdt toInstant   toEpochMilli         1055545912454             The DateTimeFormatter class replaces the old SimpleDateFormat  You can then create a ZonedDateTime from which you can extract the desired epoch time   The main advantage is that you are now thread safe   Thanks to Basil Bourque for his remarks and suggestions  Read his answer for full details

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Create Common Method to Convert String to Date format  public static void main String   args  throws Exception       long test   ConvertStringToDate  May 26 10 41 23    MMM dd hh mm ss        long test2   ConvertStringToDate  Tue  Jun 06 2017  12 30 AM    EEE  MMM dd yyyy  hh mm a        long test3   ConvertStringToDate  Jun 13 2003 23 11 52 454 UTC    MMM dd yyyy HH mm ss SSS zzz       private static long ConvertStringToDate String dateString  String format        try           return new SimpleDateFormat format  parse dateString  getTime          catch  ParseException e         return 0

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String dateTime  15-3-2019 09 50 AM    time should be two digit like 08 09 10     DateTimeFormatter dtf    DateTimeFormatter ofPattern  dd-MM-yyyy hh mm a            LocalDateTime zdt    LocalDateTime parse dateTime dtf           LocalDateTime now   LocalDateTime now            ZoneId zone   ZoneId of  Asia Kolkata            ZoneOffset zoneOffSet   zone getRules   getOffset now           long a  zdt toInstant zoneOffSet  toEpochMilli            Log d  time   ---  a     you can get zone id form this  a link

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This code shows how to use a java text SimpleDateFormat to parse a java util Date from a String   String str    Jun 13 2003 23 11 52 454 UTC   SimpleDateFormat df   new SimpleDateFormat  MMM dd yyyy HH mm ss SSS zzz    Date date   df parse str   long epoch   date getTime    System out println epoch      1055545912454   Date getTime   returns the epoch time in milliseconds

[java] Convert a date format in epoch

tl;dr

java.time

`DateTimeFormatter`

`ZonedDateTime`

Count-from-epoch

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