What is this date format 2011-08-12T20 17 46 384Z

Question

I have the following date   2011-08-12T20 17 46 384Z   What format is this   I m trying to parse it with Java 1 4 via DateFormat getDateInstance   parse dateStr  and I m getting     java text ParseException  Unparseable date   2011-08-12T20 17 46 384Z    I think I should be using SimpleDateFormat for parsing  but I have to know the format string first   All I have for that so far is yyyy-MM-dd  because I don t know what the T means in this string--something time zone-related   This date string is coming from the lcmis downloadedOn tag shown on Files CMIS download history media type

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tl dr Standard ISO 8601 format is used by your input string  Instant parse    quot 2011-08-12T20 17 46 384Z quot      ISO 8601 This format is defined by the sensible practical standard  ISO 8601  The T separates the date portion from the time-of-day portion  The Z on the end means UTC  that is  an offset-from-UTC of zero hours-minutes-seconds   The Z is pronounced    Zulu     java time The old date-time classes bundled with the earliest versions of Java have proven to be poorly designed  confusing  and troublesome  Avoid them  Instead  use the java time framework built into Java 8 and later  The java time classes supplant both the old date-time classes and the highly successful Joda-Time library  The java time classes use ISO 8601 by default when parsing generating textual representations of date-time values  The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds  That class can directly parse your input string without bothering to define a formatting pattern  Instant instant   Instant parse    quot 2011-08-12T20 17 46 384Z quot          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  Hibernate 5  amp  JPA 2 2 support java time  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 brought 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  26   bundle implementations of the java time classes  For earlier Android   lt 26   a process known as API desugaring brings a subset of the java time functionality not originally built into Android   If the desugaring does not offer what you need  the ThreeTenABP project adapts ThreeTen-Backport  mentioned above  to Android  See How to use ThreeTenABP

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This technique translates java util Date to UTC format  or any other  and back again   Define a class like so   import java util Date   import org joda time DateTime  import org joda time format DateTimeFormat  import org joda time format DateTimeFormatter   public class UtcUtility    public static DateTimeFormatter UTC   DateTimeFormat forPattern  yyyy-MM-dd T HH mm ss SSS Z    withZoneUTC      public static Date parse DateTimeFormatter dateTimeFormatter  String date        return dateTimeFormatter parseDateTime date  toDate       public static String format DateTimeFormatter dateTimeFormatter  Date date        return format dateTimeFormatter  date getTime        private static String format DateTimeFormatter dateTimeFormatter  long timeInMillis        DateTime dateTime   new DateTime timeInMillis       String formattedString   dateTimeFormatter print dateTime       return formattedString         Then use it like this   Date date   format UTC   2020-04-19T00 30 07 000Z     or  String date   parse UTC  new Date      You can also define other date formats if you require  not just UTC

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John-Skeet gave me the clue to fix my own issue around this   As a younger programmer this small issue is easy to miss and hard to diagnose   So Im sharing it in the hopes it will help someone     My issue was that I wanted to parse the following string contraining a time stamp from a JSON I have no influence over and put it in more useful variables   But I kept getting errors     So given the following  pay attention to the string parameter inside ofPattern      String str    20190927T182730 000Z   LocalDateTime fin  fin   LocalDateTime parse  str  DateTimeFormatter ofPattern  yyyyMMdd T HHmmss SSSZ        Error   Exception in thread  main  java time format DateTimeParseException  Text   20190927T182730 000Z  could not be parsed at index 19   The problem   The Z at the end of the Pattern needs to be wrapped in  Z  just like the  T  is   Change  yyyyMMdd T HHmmss SSSZ  to   yyyyMMdd T HHmmss SSS Z   and it works     Removing the Z from the pattern alltogether also led to errors   Frankly  I d expect a Java class to have anticipated this

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The T is just a literal to separate the date from the time  and the Z means  zero hour offset  also known as  Zulu time   UTC   If your strings always have a  Z  you can use   SimpleDateFormat format   new SimpleDateFormat       yyyy-MM-dd T HH mm ss SSS Z    Locale US   format setTimeZone TimeZone getTimeZone  UTC       Or using Joda Time  you can use ISODateTimeFormat dateTime

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You can use the following example       String date    2011-08-12T20 17 46 384Z        String inputPattern    yyyy-MM-dd T HH mm ss SSS Z         String outputPattern    yyyy-MM-dd HH mm ss        LocalDateTime inputDate   null      String outputDate   null        DateTimeFormatter inputFormatter   DateTimeFormatter ofPattern inputPattern  Locale ENGLISH       DateTimeFormatter outputFormatter   DateTimeFormatter ofPattern outputPattern  Locale ENGLISH        inputDate   LocalDateTime parse date  inputFormatter       outputDate   outputFormatter format inputDate        System out println  inputDate      inputDate       System out println  outputDate      outputDate

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If you guys are looking for a solution for Android  you can use the following code to get the epoch seconds from the timestamp string   public static long timestampToEpochSeconds String srcTimestamp        long epoch   0       try           if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES O                Instant instant   Instant parse srcTimestamp               epoch   instant getEpochSecond              else               SimpleDateFormat sdf   new SimpleDateFormat  yyyy-MM-dd T hh mm ss SSSSSS Z    Locale getDefault                 sdf setTimeZone TimeZone getTimeZone  UTC                 Date date   sdf parse srcTimestamp               if  date    null                    epoch   date getTime     1000                                catch  Exception e            e printStackTrace               return epoch      Sample input  2019-10-15T05 51 31 537979Z  Sample output  1571128673

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Not sure about the Java parsing  but that s ISO8601  http   en wikipedia org wiki ISO 8601

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There are other ways to parse it rather than the first answer  To parse it   1  If you want to grab information about date and time  you can parse it to a ZonedDatetime since Java 8  or Date old  object      ZonedDateTime s default format requires a zone ID like  Australia Sydney   in the end     Here  we provide a format which can parse the string correctly  DateTimeFormatter dtf   DateTimeFormatter ISO DATE TIME  ZonedDateTime zdt   ZonedDateTime parse  2011-08-12T20 17 46 384Z   dtf     or      T  is a literal      X  is ISO Zone Offset like  01  -08   For UTC  it is interpreted as  Z  Zero  literal  String pattern    yyyy-MM-dd T HH mm ss SSSX       since no built-in format  we provides pattern directly  DateFormat df   new SimpleDateFormat pattern    Date myDate   df parse  2011-08-12T20 17 46 384Z       2  If you don t care the date and time and just want to treat the information as a moment in nanoseconds  then you can use Instant      The ISO format without zone ID is Instant s default     There is no need to pass any format  Instant ins   Instant parse  2011-08-12T20 17 46 384Z

[java] What is this date format? 2011-08-12T20:17:46.384Z

tl;dr

ISO 8601

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