DateTimeFormatter String to LocalDateTime

Question

I am trying to convert the value 2022-04-30 14:34:52.900426+00:00 an instance of LocalDateTime. I have written the following code:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSSSSS'Z'");

I am getting the following error

could not be parsed at index 26

What should my formatter string be?

Answer 1

It's not working because the UTC Time offsets hasn't been written properly. It should look like this with a custom DateTimeFormatter:

//Custom DatTimeFormatter
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSSSSSZZZZZ");
formatter.parse("2022-04-30 14:34:52.900426+00:00");

You could either use the predefined ISO_OFFSET_DATE_TIME DatTimeFormatter only by replacing the space between date and time with a capital T, as the standard requires.

//Predefined DateTimeFormatter
DateTimeFormatter.ISO_OFFSET_DATE_TIME.parse("2022-04-30T14:34:52.900426+00:00");

Besides, to answer your question under @Taco Jan Osinga's reply:

No, it is not correct to use "+00:00" to just match the datetime you're trying to parse. That custom DateTimeFormatter you would build would only match datetime referring to your local TimeZone; thus it won't work with datetime from different areas.

Answer 2

Have you tried "yyyy-MM-dd HH:mm:ss.SSSSSS+00:00"?

Answer 3

tl;dr

OffsetDateTime                          // Use `OffsetDateTime`, not `LocalDateTime`, to represent a date with time and offset. 
.parse( 
    "2022-04-30 14:34:52.900426+00:00"  // Almost in ISO 8601 format.
    .replace( " " , "T" )               // Replace SPACE with T to comply with ISO 8691.
) 

See this code run live at IdeOne.com.

Wrong class, use OffsetDateTime, not LocalDateTime

LocalDateTime is exactly the wing class to use in this case. That represents a date with time-of-day. But your input indicates a date with time-of-day and an offset-from-UTC. The +00:00 means an offset of zero hours-minutes-seconds from UTC.

So parse that input as a OffsetDateTime object instead.

Rather than define a formatting pattern, I suggest merely replacing the SPACE in the middle with a T to comply with the ISO 8601 standard used by default in the java.time classes when parsing/generating text.

String input = "2022-04-30 14:34:52.900426+00:00".replace( " " , "T" ) ; 
OffsetDateTime odt = OffsetDateTime.parse( input ) ;