Java 8 DateTimeFormatter can't parse a date formatted by itself

Question

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss z");
ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(Instant.now(), ZoneId.systemDefault());
// 2016-10-10 09:28:45 PDT
String s = zonedDateTime.format(formatter);
// this call fails
ZonedDateTime.parse(s, formatter);

What's wrong with the given snippet, shouldn't formatter.parse(date.format(formatter)) evaluate to the same date ?
Exception :

java.time.DateTimeException: Unable to obtain LocalTime from TemporalAccessor: {MilliOfSecond=0, MicroOfSecond=0, HourOfAmPm=9, MinuteOfHour=28, NanoOfSecond=0, SecondOfMinute=45},ISO,America/Los_Angeles resolved to 2016-10-10 of type java.time.format.Parsed

Please post the exception and the value of string s to be complete. — Mark Rotteveel
– Mark Rotteveel, Commented Oct 8, 2016 at 7:31

greg-449 · Accepted Answer · 2016-10-08 07:34:49Z

5

Since you have specified hh (lower case h) for the 12 hour clock you have lost the information about whether this is AM / PM so the parse is complaining about that.

Using yyyy-MM-dd hh:mm:ss a Z to include the AM/PM indicator works.

answered Oct 8, 2016 at 7:34

greg-449

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1 Comment

Meno Hochschild Over a year ago

Or replace "h" by "H". (24-hour-clock)

clay · Accepted Answer · 2016-10-10 16:36:07Z

0

java.time.ZonedDateTime.parse("2016-10-10T09:28:45-07:00");

java.time.LocalDate.parse("2016-10-10");

answered Oct 10, 2016 at 16:36

clay

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