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Tag: java-time

Why does the java.time.Clock has zone information?

Why does java.time.Clock has zone information? From the Clock you only can get an Instant when calling the instant() method – which is a time without zone info. Is the only purpose to have the zone available in the clock to e.g. create a ZonedDateTime like this? ZonedDateTime.ofInstant(clock().instant(), clock().getZone()) Wouldn’t it then make sense to have a method zonedDateTime() in

Jackson , java.time , ISO 8601 , serialize without milliseconds

I’m using Jackson 2.8 and need to communicate with an API that doesn’t allow milliseconds within ISO 8601 timestamps. The expected format is this: “2016-12-24T00:00:00Z” I’m using Jackson’s JavaTimeModule with WRITE_DATES_AS_TIMESTAMPS set to false. But this will print milliseconds. So I tried to use objectMapper.setDateFormat which didn’t change anything. My current workaround is this: I’m overriding the default serializer for

What’s the difference between ZonedDateTime and OffsetDateTime?

I’ve read the documentation, but I still can’t get when I should use one or the other: OffsetDateTime ZonedDateTime According to documentation OffsetDateTime should be used when writing date to database, but I don’t get why. Answer Q: What’s the difference between java 8 ZonedDateTime and OffsetDateTime? The javadocs say this: “OffsetDateTime, ZonedDateTime and Instant all store an instant on

JSR-310 – parsing seconds fraction with variable length

Is there a way how to create JSR-310 formatter that is able to parse both following date/times with variable length of seconds fraction? or Example code: Answer This solves the problem: The answer by JiriS is incorrect, as it uses appendValue whereas the correct way is to use DateTimeFormatterBuilder.appendFraction (which also handles the decimal point). The difference can be seen

Unit testing a class with a Java 8 Clock

Java 8 introduced java.time.Clock which can be used as an argument to many other java.time objects, allowing you to inject a real or fake clock into them. For example, I know you can create a Clock.fixed() and then call Instant.now(clock) and it will return the fixed Instant you provided. This sounds perfect for unit testing! However, I’m having trouble figuring

Convert java.util.Date to java.time.LocalDate

What is the best way to convert a java.util.Date object to the new JDK 8/JSR-310 java.time.LocalDate? Answer Short answer Explanation Despite its name, java.util.Date represents an instant on the time-line, not a “date”. The actual data stored within the object is a long count of milliseconds since 1970-01-01T00:00Z (midnight at the start of 1970 GMT/UTC). The equivalent class to java.util.Date

How to get last month/year in java?

How do I find out the last month and its year in Java? e.g. If today is Oct. 10 2012, the result should be Month = 9 and Year = 2012. If today is Jan. 10 2013, the result should be Month = 12 and Year = 2012. Answer Your solution is here but instead of addition you need to

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