java time format DateTimeParseException Text could not be parsed at index 21

Question

I get the datetime value as    created at   2012-02-22T02 06 58 147Z  Read-only  The time at which this task was created    Which is given by Asana API  I am using Java 8 to parse the date time as following  import java time    import java time format     public class Times      public static void main String   args        final String dateTime    2012-02-22T02 06 58 147Z       DateTimeFormatter formatter   DateTimeFormatter ofPattern  yyyy-MM-dd T hh mm ss SX          final ZonedDateTime parsed   ZonedDateTime parse dateTime  formatter       System out println parsed           When I run this  I get the following error  Exception in thread  main  java time format DateTimeParseException  Text  2012-02-22T02 06 58 147Z  could not be parsed at index 21     at java time format DateTimeFormatter parseResolved0 DateTimeFormatter java 1947      at java time format DateTimeFormatter parse DateTimeFormatter java 1849      at java time ZonedDateTime parse ZonedDateTime java 597      at Times main Times java 11      at sun reflect NativeMethodAccessorImpl invoke0 Native Method      at sun reflect NativeMethodAccessorImpl invoke NativeMethodAccessorImpl java 62      at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 43      at java lang reflect Method invoke Method java 497      at com intellij rt execution application AppMain main AppMain java 140    What is not right here

User · Answer

If your input always has a time zone of "zulu" ("Z" = UTC), then you can use DateTimeFormatter.ISO_INSTANT (implicitly):

final Instant parsed = Instant.parse(dateTime);

If time zone varies and has the form of "+01:00" or "+01:00:00" (when not "Z"), then you can use DateTimeFormatter.ISO_OFFSET_DATE_TIME:

DateTimeFormatter formatter = DateTimeFormatter.ISO_OFFSET_DATE_TIME;
final ZonedDateTime parsed = ZonedDateTime.parse(dateTime, formatter);

If neither is the case, you can construct a DateTimeFormatter in the same manner as DateTimeFormatter.ISO_OFFSET_DATE_TIME is constructed.

Your current pattern has several problems:

not using strict mode (ResolverStyle.STRICT);
using yyyy instead of uuuu (yyyy will not work in strict mode);
using 12-hour hh instead of 24-hour HH;
using only one digit S for fractional seconds, but input has three.

User · Answer

Your original problem was wrong pattern symbol  h  which stands for the clock hour  range 1-12   In this case  the am-pm-information is missing  Better  use the pattern symbol  H  instead  hour of day in range 0-23   So the pattern should rather have been like   uuuu-MM-dd T HH mm ss SSSX  best pattern also suitable for strict mode

User · Answer

The default parser can parse your input  So you don t need a custom formatter and  String dateTime    2012-02-22T02 06 58 147Z   ZonedDateTime d   ZonedDateTime parse dateTime     works as expected

User · Answer

The following worked for me  import java time    import java time format     public class Times      public static void main String   args        final String dateTime    2012-02-22T02 06 58 147Z       DateTimeFormatter formatter   DateTimeFormatter ISO INSTANT      final ZonedDateTime parsed   ZonedDateTime parse dateTime  formatter withZone ZoneId of  UTC          System out println parsed toLocalDateTime             and gave me output as    2012-02-22T02 06 58 147

[java] java.time.format.DateTimeParseException: Text could not be parsed at index 21

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