How to get TimeZone offset value in java

Question

I have a date coming from a device and I want to do the following in Java:

I want to parse this date "2021-05-27T18:47:07+0530" to yyyy-mm-dd HH:MM:SS
Get the Date's offset value so that I can get the timezone offset as +05:30 or whatever timezone it comes from.

For the first one I have done this and looks like it works, but any better smaller approach will be handy as well:


        String date = "2021-05-27T18:47:07+0530";
        String inputPattern = "yyyy-MM-dd'T'HH:mm:ss+SSSS";
        String outputPattern = "yyyy-MM-dd HH:mm:ss";
        LocalDateTime inputDate = null;
        String outputDate = null;
        DateTimeFormatter inputFormatter = DateTimeFormatter.ofPattern(inputPattern, Locale.ENGLISH);
        DateTimeFormatter outputFormatter = DateTimeFormatter.ofPattern(outputPattern, Locale.ENGLISH);
        inputDate = LocalDateTime.parse(date, inputFormatter);
        outputDate = outputFormatter.format(inputDate);
        System.out.println("inputDate: " + inputDate);
        System.out.println("outputDate: " + outputDate);

The Ouput is:

inputDate: 2021-05-27T18:47:07.053
outputDate: 2021-05-27 18:47:07

I don't know how to get the offset value of timezone in this case.

There are many recommendations including using SimpleDateFormat and ZonedDateTime etc but should be the best answer for this considering the offset value can be dynamic i.e it can be +05:30,+09:00 etc.

Please help in this case.

even though is deprecated, you can use Date::getTimezoneOffset — Alberto
– Alberto, Commented May 27, 2021 at 20:05
Does this answer your question? Get TimeZone offset value from TimeZone without TimeZone name — Alberto
– Alberto, Commented May 27, 2021 at 20:05
Hi @Berto99 there are too many answers to come to a conclusion and most the accepted answer is taking date as the current date not the date we are providing. So, that's why it doesn't really answer my question. — RahulNans
– RahulNans, Commented May 28, 2021 at 18:26

WJS · Accepted Answer · 2021-05-28 00:05:11Z

2

Try it like this.

String dateTime = "2021-05-27T18:47:07+0530";
String inputPattern = "yyyy-MM-dd'T'HH:mm:ssZ";
String outputPattern = "yyyy-MM-dd HH:mm:ss";
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ssZ", 
    Locale.ENGLISH);
ZonedDateTime zdt = ZonedDateTime.parse(dateTime, dtf);
ZoneOffset tz = zdt.getOffset();
System.out.println(tz);
System.out.println(zdt.format(DateTimeFormatter.ofPattern(outputPattern,
        Locale.ENGLISH)));

Prints

+05:30
2021-05-27 18:47:07

The zoned date time could also be reprinted using the same format by which it was originally parsed.

answered May 28, 2021 at 0:05

WJS

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8 Comments

Anonymous Over a year ago

Good answer. Prefer OffsetDateTime over ZonedDateTmesince the string contains an offset and no time zone (like Asia/Colombo or America/New_York).

RahulNans Over a year ago

It works very well in the case of let's say +0100 or +0900 but when using +0000 which is GMT it returns the value Z for the offset. As I understand is the Zulu date time and it would return Z instead of 00:00. Correct?

WJS Over a year ago

Yes. But check out this link which addresses a solution using an offset formatter.

RahulNans Over a year ago

I used this, since by date is dynamic, not instant.now(), so I converted to Instant object and

Instant result = Instant.from(dtf.parse(dateTime));         ZoneOffset offset = ZoneId.systemDefault().getRules().getOffset(result);         System.out.println(offsetFormatter.format(offset));

will get me the same result everytime that is my timezone offset. So, I think the instant date needs to be corrected.

WJS Over a year ago

@RahulNans Great! Whatever meets your requirements.

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