Cant display date as yyyy-MM-dd'T'HH:mm:ss:SSS Java

Question

Im getting the following error when I try to convert the following string. Id like the Date to be in the format yyyy-MM-dd'T'HH:mm:ss:SSS but instead the Date seems to be coming out as Sun Mar 01 23:00:01 GMT 2020

    String FULL_ISO_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSS";
    SimpleDateFormat formatter = new SimpleDateFormat(FULL_ISO_DATE_FORMAT);
    Date from = formatter.parse("2020-03-01T23:00:01.000");

Error

feign.FeignException: status 400 reading Controller#searchController(Date,Date,Integer,String); content:
{"status":"fail","data":{"errors":[{"type":"IllegalArgumentException","description":"Invalid value Sun Mar 01 23:00:01 GMT 2020 for filter from. Field needs to be in format: yyyy-MM-dd'T'HH:mm:ss.SSS"}]}]}

Any help would be appreciated. I need to use the Date object as the constructor Im querying is using the Date object. Ideally I'd like to use LocalDateTime but I cant.

You say that you get the error when you "try to convert the following string," but you don't specify the string; you only show the parsing pattern and an error message. Judging from the error message, I would assume that the string you are trying to parse is actually `Sun Mar 01 23:00:01 GMT 2020`, and that obviously won't work. Look for a step earlier in your request processing where you convert a `Date` instance to a `String` with its `toString()` method. This might be an implicit call somewhere. — erickson, Mar 16 '20 at 21:43
I recommend you don’t use `SimpleDateFormat` and `Date`. Those classes are poorly designed and long outdated, the former in particular notoriously troublesome. Instead just use `LocalDateTime` from [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/). — Ole V.V., Mar 17 '20 at 06:03
You are asking the impossible. A `Date` hasn’t got (as in cannot have) a format. What you are seeing when you see `Sun Mar 01 23:00:01 GMT 2020` is the result of implicitly calling its `toString` method when printing it. — Ole V.V., Mar 17 '20 at 06:04

Ryuzaki L · Answer 1 · 2020-03-16T18:59:15.890

1

Use the LocalDateTime from java-8 date-time API and stop using legacy Date classes

String FULL_ISO_DATE_FORMAT = DateTimeFormatter. ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");
LocalDateTime dateTime = LocalDateTime.now();
dateTime.format(FULL_ISO_DATE_FORMAT);

edited Mar 16 '20 at 18:59

answered Mar 16 '20 at 18:56

Ryuzaki L

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I have to use the Date object, the constructor is using Date. When I try to use the LocalDateTime it gives mismatch errors in the class – Mar 16 '20 at 19:12
can you show more code @KahunaDub with pointing to exact problem – Ryuzaki L Mar 16 '20 at 19:14
@KahunaDub I've edited my answer to show how to convert a ```LocalDateTime``` to the old ```Date```. This way you will have your compatibility. – akuzminykh Mar 16 '20 at 20:09

akuzminykh · Answer 2 · 2020-03-16T20:07:37.797

Please don't use the old classes Date and SimpleDateFormat. Use the new java.time api that is much more robust and better designed.

You can do the same thing as follows:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS");
LocalDateTime date = LocalDateTime.parse("2020-03-01T23:00:01.000", formatter);

Keep in mind that you can convert it to Date for compatibility like so:

Date legacyDate = Date.from(date.atZone(ZoneId.systemDefault()).toInstant());

Cant display date as yyyy-MM-dd'T'HH:mm:ss:SSS Java

2 Answers2