SimpleDateFormat parsing date with Z literal

Question

I am trying to parse a date that looks like this      2010-04-05T17 16 00Z   This is a valid date per http   www ietf org rfc rfc3339 txt  The  Z  literal  quote   imply that UTC is the preferred reference point for the specified time    If I try to parse it using SimpleDateFormat and this pattern   yyyy-MM-dd T HH mm ss   it will be parsed as a Mon Apr 05 17 16 00 EDT 2010   SimpleDateFormat is unable to parse the string with these patterns   yyyy-MM-dd T HH mm ssz yyyy-MM-dd T HH mm ssZ   I can explicitly set the TimeZone to use on the SimpleDateFormat to get the expected output  but I don t think that should be necessary  Is there something I am missing  Is there an alternative date parser

User · Answer

Since java 8 just use ZonedDateTime parse  2010-04-05T17 16 00Z

User · Answer

In the pattern  the inclusion of a  z  date-time component indicates that timezone format needs to conform to the General time zone  standard   examples of which are Pacific Standard Time  PST  GMT-08 00    A  Z  indicates that the timezone conforms to the RFC 822 time zone standard  e g  -0800   I think you need a DatatypeConverter       Test public void testTimezoneIsGreenwichMeanTime   throws ParseException       final Calendar calendar   javax xml bind DatatypeConverter parseDateTime  2010-04-05T17 16 00Z        TestCase assertEquals  gotten timezone    GMT 00 00   calendar getTimeZone   getID

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The restlet project includes an InternetDateFormat class that can parse RFC 3339 dates   Restlet InternetDateFormat  Though  you might just want to replace the trailing  Z  with  UTC  before you parse it

User · Answer

The date you are parsing is in ISO 8601 format   In Java 7 the pattern to read and apply the timezone suffix should read yyyy-MM-dd T HH mm ssX

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I provide another answer that I found by api-client-library by Google  try       DateTime dateTime   DateTime parseRfc3339 date       dateTime   new DateTime new Date dateTime getValue     TimeZone getDefault         long timestamp   dateTime getValue        get date in timestamp     int timeZone   dateTime getTimeZoneShift        get timezone offset   catch  NumberFormatException e        e printStackTrace        Installation guide  https   developers google com api-client-library java google-api-java-client setup download  Here is API reference  https   developers google com api-client-library java google-http-java-client reference 1 20 0 com google api client util DateTime  Source code of DateTime Class  https   github com google google-http-java-client blob master google-http-client src main java com google api client util DateTime java  DateTime unit tests  https   github com google google-http-java-client blob master google-http-client src test java com google api client util DateTimeTest java L121

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The  X  only works if partial seconds are not present  i e  SimpleDateFormat pattern of   yyyy-MM-dd T HH mm ssX   Will correctly parse   2008-01-31T00 00 00Z   but   yyyy-MM-dd T HH mm ss SX   Will NOT parse   2008-01-31T00 00 00 000Z   Sad but true  a date-time with partial seconds does not appear to be a valid ISO date  http   en wikipedia org wiki ISO 8601

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With regards to JSR-310 another project of interest might be threetenbp      JSR-310 provides a new date and time library for Java SE 8  This project is the backport to Java SE 6 and 7    In case you are working on an Android project you might want to checkout the ThreeTenABP library   compile  com jakewharton threetenabp threetenabp   version        JSR-310 was included in Java 8 as the java time   package  It is a full replacement for the ailing Date and Calendar APIs in both Java and Android  JSR-310 was backported to Java 6 by its creator  Stephen Colebourne  from which this library is adapted

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tl dr  Instant parse    2010-04-05T17 16 00Z        ISO 8601 Standard  Your String complies with the ISO 8601 standard  of which the mentioned RFC 3339 is a profile    Avoid java util Date  The java util Date and  Calendar classes bundled with Java are notoriously troublesome  Avoid them   Instead use either the Joda-Time library or the new java time package in Java 8  Both use ISO 8601 as their defaults for parsing and generating string representations of date-time values    java time  The java time framework built into Java 8 and later supplants the troublesome old java util Date  Calendar classes  The new classes are inspired by the highly successful Joda-Time framework  intended as its successor  similar in concept but re-architected  Defined by JSR 310  Extended by the ThreeTen-Extra project  See the Tutorial   The Instant class in java time represents a moment on the timeline in UTC time zone   The Z at the end of your input string means Zulu which stands for UTC  Such a string can be directly parsed by the Instant class  with no need to specify a formatter   String input    2010-04-05T17 16 00Z   Instant instant   Instant parse   input      Dump to console   System out println    instant      instant         instant  2010-04-05T17 16 00Z   From there you can apply a time zone  ZoneId  to adjust this Instant into a ZonedDateTime  Search Stack Overflow for discussion and examples   If you must use a java util Date object  you can convert by calling the new conversion methods added to the old classes such as the static method java util Date from  Instant     java util Date date   java util Date from  instant      Joda-Time  Example in Joda-Time 2 5   DateTimeZone timeZone   DateTimeZone forID   Europe Paris     DateTime dateTime   new DateTime   2010-04-05T17 16 00Z   timeZone      Convert to UTC   DateTime dateTimeUtc   dateTime withZone  DateTimeZone UTC      Convert to a java util Date if necessary   java util Date date   dateTime toDate

User · Answer

Java doesn t parse ISO dates correctly   Similar to McKenzie s answer   Just fix the Z before parsing   Code  String string    2013-03-05T18 05 05 000Z   String defaultTimezone   TimeZone getDefault   getID    Date date    new SimpleDateFormat  yyyy-MM-dd T HH mm ss SSSZ    parse string replaceAll  Z      0000      System out println  string      string   System out println  defaultTimezone      defaultTimezone   System out println  date       new SimpleDateFormat  yyyy-MM-dd T HH mm ss SSSZ    format date      Result  string  2013-03-05T18 05 05 000Z defaultTimezone  America New York date  2013-03-05T13 05 05 000-0500

User · Answer

Under Java 8 use the predefined DateTimeFormatter ISO DATE TIME   DateTimeFormatter formatter   DateTimeFormatter ISO DATE TIME   ZonedDateTime result   ZonedDateTime parse  2010-04-05T17 16 00Z   formatter     I guess its the easiest way

User · Answer

The time zone should be something like  GMT 00 00  or 0000 in order to be properly parsed by the SimpleDateFormat - you can replace Z with this construction

User · Answer

According to last row on the Date and Time Patterns table of the Java 7 API   X   Time zone   ISO 8601 time zone  -08  -0800  -08 00  For ISO 8601 time zone you should use     X for  -08 or Z     XX for  -0800 or Z   XXX for  -08 00 or Z     so to parse your  2010-04-05T17 16 00Z  you can use either   yyyy-MM-dd T HH mm ssX  or  yyyy-MM-dd T HH mm ssXX  or  yyyy-MM-dd T HH mm ssXXX          System out println new SimpleDateFormat  yyyy-MM-dd T HH mm ssX   parse  2010-04-05T17 16 00Z         System out println new SimpleDateFormat  yyyy-MM-dd T HH mm ssXX   parse  2010-04-05T17 16 00Z         System out println new SimpleDateFormat  yyyy-MM-dd T HH mm ssXXX   parse  2010-04-05T17 16 00Z       will correctly print out  Mon Apr 05 13 16 00 EDT 2010

[java] SimpleDateFormat parsing date with 'Z' literal

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