How to get current moment in ISO 8601 format with date hour and minute

Question

What is the most elegant way to get ISO 8601 formatted presentation of current moment  UTC  It should look like  2010-10-12T08 50Z   Example    String iso8601   DateFormat getDateTimeInstance DateFormat ISO 8601  format date

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Still  joda-time does only support the extended format   2015-12-09T00 22 42 930Z  not the basic   20151209T002242 930Z     we might be better off testing a list of formats with java SimpleDateFormat

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I did it in Android using Calendar and SimpleDateFormat  The following method returns a Calendar with the  GMT  TimeZone  This is the universal time zone   Then you can use the Calendar class to set the hour between differents time zones  using the method setTimeZone   of the Calendar class   private static final String GMT    GMT   private static final String DATE FORMAT ISO    yyyyMMdd T HHmmss    public static Calendar isoToCalendar final String inputDate        Calendar calendar   Calendar getInstance TimeZone getTimeZone GMT        try           SimpleDateFormat dateFormat   new SimpleDateFormat DATE FORMAT ISO  Locale US           dateFormat setTimeZone TimeZone getTimeZone GMT            Date date   dateFormat parse inputDate           calendar setTime date         catch  ParseException e            Log e  TAG  e getMessage               return calendar      REMEMBER   The Date class doesn t know about the TimeZone existence  By this reason  if you debug one date you always see the date for your current timezone

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tl dr  Some of the other Answers are correct in recommending java time classes but go about using unnecessary lengths for your specific needs   Instant now                                    Capture the current moment in UTC with a resolution as fines nanoseconds but usually in microseconds or milliseconds          truncatedTo  ChronoUnit MINUTES        Lop off any seconds or fractional second  to get a value in whole minutes          toString                               Generate a String in standard ISO 8601 format where a  T  separates the year-month-day from the hour-minute-second  and the  Z  on the end for    Zulu    means UTC       2018-01-23T12 34Z   Instant  toString  The jav time Instant class represents a moment in UTC  always in UTC    Instant instant   Instant now          instant toString    2018-01-23T12 34 56 123456Z   The Z on the end of your example string 2010-10-12T08 50Z is pronounced    Zulu    and means UTC    Your desired format happens to comply with the ISO 8601 standard  The java time classes use these standard formats by default when parsing generating strings  So no need to specify a formatting pattern  Just call Instant  toString as seen above   If you specifically want whole minutes without second or fractional second  then truncate  Specify a unit of time via ChronoUnit class   Instant instant   Instant now   truncatedTo  ChronoUnit MINUTES     String output   instant toString        Generate a  String  object in standard ISO 8601 format      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   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  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   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 could use Java s SimpleDateFormat with the following pattern yyyy-MM-dd T HH mm ssXXX for ISO 8601      Sample Code   lists out for all the available time zones    for  String timeZone   TimeZone getAvailableIDs          DateFormat dateFormat   new SimpleDateFormat  yyyy-MM-dd T HH mm ssXXX        dateFormat setTimeZone TimeZone getTimeZone timeZone        String formatted   dateFormat format new Date         System out print formatted        if  formatted endsWith  Z                     These time zone s have offset of  0  from GMT          System out print   t     timeZone                    System out println        You could use      TimeZone getDefault     for the default vm timezone  More here  You might notice the date time for few time zones that end with  Z   These time zones have offset of  0  from GMT   More info can be found here

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DateTimeFormatter ISO DATE TIME          withZone ZoneOffset UTC           format yourDateObject toInstant

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Java 8 Native  java time makes it simple since Java 8   And thread safe   ZonedDateTime now  ZoneOffset UTC   format  DateTimeFormatter ISO INSTANT     Result  2015-04-14T11 07 36 639Z     You may be tempted to use lighter Temporal such as Instant or LocalDateTime    but they lacks formatter support or time zone data    Only ZonedDateTime works out of the box    By tuning or chaining the options   operations of ZonedDateTime and DateTimeFormatter  you can easily control the timezone and precision  to a certain degree   ZonedDateTime now  ZoneId of   Europe Paris                    truncatedTo  ChronoUnit MINUTES                 format  DateTimeFormatter ISO DATE TIME     Result  2015-04-14T11 07 00 01 00 Europe Paris   Refined requirements  such as removing the seconds part  must still be served by custom formats or custom post process    format  DateTimeFormatter ISO LOCAL DATE TIME      2015-04-14T11 07 00  format  DateTimeFormatter ISO LOCAL DATE      2015-04-14  format  DateTimeFormatter ISO LOCAL TIME      11 07 00  format  DateTimeFormatter ofPattern   yyyy-MM-dd HH mm         2015-04-14 11 07      For Java 6  amp  7  you may consider back-ports of java time such as ThreeTen-Backport  which also has an Android port    Both are lighter than Joda  and has learned from Joda s experience - esp  considering that java time is designed by Joda s author

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If you don t want to include Jodatime  as nice as it is   javax xml bind DatatypeConverter printDateTime      Calendar getInstance TimeZone getTimeZone  UTC         which returns a string of   2012-07-10T16 02 48 440Z   which is slightly different to the original request but is still ISO-8601

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Joda-Time  Update  The Joda-Time project is now in maintenance mode  with the team advising migration to the java time classes  For Java 6  amp  7  see the ThreeTen-Backport project  further adapted for Android in the ThreeTenABP project   Using the Joda-Time library     String output   new DateTime  DateTimeZone UTC   toString       This is thread-safe  Joda-Time creates new immutable objects rather than changing existing objects   If you truly intended to ask for a format without seconds  resolving to minutes  then use one of the many other built-in formatters in Joda-Time   DateTime now   new DateTime  DateTimeZone UTC     String output   ISODateTimeFormat dateHourMinute print  now       java time  For Java 8 and later  Joda-Time continues to work  But the built-in java time framework supplants Joda-Time  So migrate your code from Joda-Time to java time as soon as is convenient   See my other Answer for a modern solution     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   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  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   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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private static String getCurrentDateIso            Returns the current date with the same format as Javascript s new Date   toJSON    ISO 8601     DateFormat dateFormat   new SimpleDateFormat  yyyy-MM-dd T HH mm ss SSS Z    Locale US       dateFormat setTimeZone TimeZone getTimeZone  UTC         return dateFormat format new Date

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Here s a whole class optimized so that invoking  now    doesn t do anything more that it has to do   public class Iso8601Util       private static TimeZone tz   TimeZone getTimeZone  UTC        private static DateFormat df   new SimpleDateFormat  yyyy-MM-dd T HH mm Z          static               df setTimeZone tz              public static String now                 return df format new Date

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As of Java 8 you can simply do   Instant now   toString      From the java time Instant docs      now            public static Instant now        Obtains the current instant from the system clock       This will query the system UTC clock to obtain the current instant     nbsp      toString            public String toString        A string representation of this instant using ISO-8601 representation       The format used is the same as DateTimeFormatter ISO INSTANT

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Use SimpleDateFormat to format any Date object you want   TimeZone tz   TimeZone getTimeZone  UTC    DateFormat df   new SimpleDateFormat  yyyy-MM-dd T HH mm Z        Quoted  Z  to indicate UTC  no timezone offset df setTimeZone tz   String nowAsISO   df format new Date       Using a new Date   as shown above will format the current time

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ISO 8601 may contains seconds  see http   en wikipedia org wiki ISO 8601 Times  so the code should be   DateFormat df   new SimpleDateFormat  yyyy-MM-dd T HH mm ss Z

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They should have added some kind of simple way to go from Date to Instant and also a method called toISO8601  which is what a lot of people are looking for  As a complement to other answers  from a java util Date to ISO 8601 format   Instant ofEpochMilli date getTime    toString      It is not really visible when using auto-completion but  java time Instant toString         A string representation of this instant using ISO-8601

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For Java version 7  You can follow Oracle documentation   http   docs oracle com javase 7 docs api java text SimpleDateFormat html  X - is used for ISO 8601 time zone  TimeZone tz   TimeZone getTimeZone  UTC    DateFormat df   new SimpleDateFormat  yyyy-MM-dd T HH mm ssX    df setTimeZone tz   String nowAsISO   df format new Date      System out println nowAsISO    DateFormat df1   new SimpleDateFormat  yyyy-MM-dd T HH mm ssX      nowAsISO    2013-05-31T00 00 00Z   Date finalResult   df1 parse nowAsISO    System out println finalResult

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I do believe the easiest way is to first go to instant and then to string like    String d   new Date   toInstant   toString      Which will result in   2017-09-08T12 56 45 331Z

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Java 8   thisMoment   DateTimeFormatter ofPattern  yyyy-MM-dd T HH mmX                                  withZone ZoneOffset UTC                                 format Instant now         Pre Java 8   thisMoment   String format   tFT  lt tRZ                              Calendar getInstance TimeZone getTimeZone  Z        From the docs       R  nbsp  nbsp  nbsp  Time formatted for the 24-hour clock as   tH  tM     F  nbsp  nbsp  nbsp  ISO 8601  complete date formatted as   tY- tm- td

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For systems where the default Time Zone is not UTC     TimeZone tz   TimeZone getTimeZone  UTC    DateFormat df   new SimpleDateFormat  yyyy-MM-dd T HH mm Z     df setTimeZone tz   String nowAsISO   df format new Date       The SimpleDateFormat instance may be declared as a global constant if needed frequently  but beware that this class is not thread-safe  It must be synchronized if accessed concurrently by multiple threads     EDIT  I would prefer Joda Time if doing many different Times Date manipulations    EDIT2  corrected  setTimeZone does not accept a String  corrected by Paul

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use JodaTime      The ISO 8601 calendar system is the default implementation within Joda-Time     Here is the doc for JodaTime Formatter   Edit   If you don t want to add or if you don t see value of adding above library you could just use in built SimpleDateFormat class to format the Date to required ISO format  as suggested by  Joachim Sauer  DateFormat df   new SimpleDateFormat  yyyy-MM-dd T HH mmZ    String nowAsString   df format new Date

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DateFormatUtils from Apache commons-lang3 have useful constants  for example  DateFormatUtils ISO DATETIME FORMAT

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If you care about performance  I created a library which outperforms standard Java parser and formatter in manipulating with ISO8601-formatted dates  DatetimeProcessor implementations are thread-safe and can be cached in a concurrent map or static fields    lt dependency gt     lt groupId gt com axibase lt  groupId gt     lt artifactId gt date-processor lt  artifactId gt     lt version gt 1 0 3 lt  version gt   lt  dependency gt    import com axibase date DatetimeProcessor  import com axibase date PatternResolver  import org junit Before  import org junit Test   import java time Clock  import java time Instant  import java time ZoneId  import java time ZoneOffset   import static org hamcrest MatcherAssert assertThat  import static org hamcrest core Is is   public class DateFormatTest       private Clock clock        Before     public void prepare             clock   Clock fixed Instant ofEpochMilli 1571285405300L   ZoneId of  Europe Berlin                 Test     public void testIsoMillis            final DatetimeProcessor formatter   PatternResolver createNewFormatter  iso            assertThat formatter print clock millis    ZoneOffset UTC   is  2019-10-17T04 10 05 300Z                 Test     public void testIsoMillisLocalZone            final DatetimeProcessor formatter   PatternResolver createNewFormatter  iso            assertThat formatter print clock millis    clock getZone     is  2019-10-17T06 10 05 300 02 00                 Test     public void testIsoMinutes            final DatetimeProcessor formatter   PatternResolver createNewFormatter  yyyy-MM-ddTHH mmXXX            assertThat formatter print clock millis    ZoneOffset UTC   is  2019-10-17T04 10Z

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Try This   SimpleDateFormat sdf   new SimpleDateFormat  yyyy-MM-dd T HH mm ss SSSSSSSZ            String date sdf format  new Date        Its For  ISO 8601 format

[java] How to get current moment in ISO 8601 format with date, hour, and minute?

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