{"id":18899,"date":"2018-07-31T04:23:43","date_gmt":"2018-07-30T22:53:43","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-java-date-and-utctimeoffset-closed\/"},"modified":"2018-07-31T04:23:43","modified_gmt":"2018-07-30T22:53:43","slug":"solved-java-date-and-utctimeoffset-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-java-date-and-utctimeoffset-closed\/","title":{"rendered":"[Solved] Java Date and utcTimeOffset [closed]"},"content":{"rendered":"

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java.time, the modern Java date and time API<\/h2>\n
    ZoneId danishTime = ZoneId.of(\"Europe\/Copenhagen\");\n    DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(\"uuuuMMddHHmmss\");\n    DateTimeFormatter offsetFormatter = DateTimeFormatter.ofPattern(\"XX\");\n\n    String dateTimeString = \"20180730131847\";\n    String offsetString = \"+0200\";\n    ZoneOffset offset = ZoneOffset.from(offsetFormatter.parse(offsetString));\n    ZonedDateTime dateTime = LocalDateTime.parse(dateTimeString, dateTimeFormatter)\n            .atOffset(offset)\n            .atZoneSameInstant(danishTime);\n    System.out.println(\"Danish time: \" + dateTime);\n<\/code><\/pre>\n
Output from this code is:<\/p>\n
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Danish time: 2018-07-30T13:18:47+02:00[Europe\/Copenhagen]<\/p>\n<\/blockquote>\n
The time zone to use for Denmark is Europe\/Copenhagen. While the Faroe islands and Greenland use other time zones and are in a national community (\u201crigsf\u00e6llesskab\u201d) with Denmark under the same queen, they are not part of Denmark proper, so can be ignored when Danish time is asked for. Since Danish summer time agrees with your example offset of +0200, in this case we get the same time out as we put in. With a date in winter, for example, this would not have been the case because Danish standard time is at offset +0100.<\/p>\n
Java 8 is not an option<\/h2>\n
No big problem. java.time has been backported.<\/p>\n