Convert string to OffsetDateTime in Java

Question

I am trying to convert a string in OffsetDateTime but getting below error.

java.time.format.DateTimeParseException: Text '20150101' could not be parsed: Unable to obtain OffsetDateTime from TemporalAccessor: {},ISO resolved to 2015-01-01 of type java.time.format.Parsed

Code : OffsetDateTime.parse("20150101", DateTimeFormatter.ofPattern("yyyyMMdd"));

Expected output: OffsetDateTime object with date 20150101.

I really appreciate any help you can provide.

Thanks,

Answer 1

OffsetDateTime represents a date-time with an offset , for eg.

2007-12-03T10:15:30+01:00

The text you are trying to parse does not conform to the requirements of OffsetDateTime. See https://docs.oracle.com/javase/8/docs/api/java/time/OffsetDateTime.html

The string being parsed neither contains the ZoneOffset nor time. From the string and the pattern of the formatter, it looks like you just need a LocalDate. So, you could use :

LocalDate.parse("20150101", DateTimeFormatter.ofPattern("yyyyMMdd"));

Answer 2

Thanks everyone for your reply. Earlier I was using joda datetime (look at below method) to handle date and datetime both but I wanted to use Java8 libraries instead of the external libraries.

static public DateTime convertStringInDateFormat(String date, String dateFormat){
    DateTimeFormatter formatter = DateTimeFormat.forPattern(dateFormat);
return formatter.parseDateTime(date);
}

I was expecting same with OffsetDateTime but got to know we can use ZonedDateTime or OffsetDateTime if we want to work with a date/time in a certain time zone. As I am working on Period and Duration for which LocalDate can help.

String to DateTime:

LocalDate date =
LocalDate.parse("20150101", DateTimeFormatter.ofPattern("yyyyMMdd"));

LocalDate to desired string format:

String dateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'";
date.atStartOfDay().format(DateTimeFormatter.ofPattern(dateFormat));