CODEWITHSUNDEEP
javadatetimezoneddatetime
KunLun
KunLun

Reputation: 3225

Convert String to ZonedDateTime and change TimeZone

I have this string "Tue Apr 09 2019 12:59:51 GMT+0300"

I want to convert to ZonedDateTime. 

DateTimeFormatter dtf = DateTimeFormatter.ofPattern("EEE MMM dd yyyy HH:mm:ss OOOO");
ZonedDateTime zdt = ZonedDateTime.parse(a, dtf);

After convert to ZonedDateTime, I want to change the timezone from GMT+0300 to other timezone.

My first problem is at parse. I get:

DateTimeParseException: Text 'Tue Apr 09 2019 12:59:51 GMT+0300' could not be parsed at index 25 (at GMT+0300, I think OOOO it's not right, but I don't know what else it is)

After that I don't know how to change the timezone.

Upvotes: 2

Views: 1299

Answers (2)

Anonymous
Anonymous

Reputation: 86120

Since your string contains an offset and no time zone, what do you want a ZonedDateTime for? OffsetDateTime is more appropriate.

    DateTimeFormatter dtf = DateTimeFormatter.ofPattern(
            "EEE MMM dd yyyy HH:mm:ss 'GMT'xx", Locale.ROOT);
    String a = "Tue Apr 09 2019 12:59:51 GMT+0300";
    System.out.println(OffsetDateTime.parse(a, dtf));

2019-04-09T12:59:51+03:00

A time zone is a place on earth and encompasses historic and known future changes in UTC offset in that place. A time zone is conventionally given in the region/city format, for example Asia/Rangoon.

Edit

I use ZonedDateTime because I use time zone in my app.

I’m unsure exactly what you mean. Maybe you have decided in advance which time zone you are using? For example:

    ZoneId zone = ZoneId.of("Europe/Zaporozhye");
    OffsetDateTime odt = OffsetDateTime.parse(a, dtf);
    ZonedDateTime zdt = odt.atZoneSameInstant(zone);
    System.out.println(zdt);

2019-04-09T12:59:51+03:00[Europe/Zaporozhye]

If for some reason you want to regard GMT+0300 as a time zone even though it isn’t, the parsing I showed first works with ZonedDateTime too:

    System.out.println(ZonedDateTime.parse(a, dtf));

2019-04-09T12:59:51+03:00

Upvotes: 2

xingbin
xingbin

Reputation: 28269

OOOO expects the a colon before minute field, as the doc says:

Four letters outputs the full form, which is localized offset text, such as 'GMT, with 2-digit hour and minute field, optional second field if non-zero, and colon, for example 'GMT+08:00'.

You can insert a : before the last 00 programmatically, then parse it.

Upvotes: 4

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