java-time – Page 9 – Tarik Billa

How can I parse/format dates with LocalDateTime? (Java 8)

November 25, 2022 by Tarik

Parsing date and time To create a LocalDateTime object from a string you can use the static LocalDateTime.parse() method. It takes a string and a DateTimeFormatter as parameter. The DateTimeFormatter is used to specify the date/time pattern. String str = “1986-04-08 12:30”; DateTimeFormatter formatter = DateTimeFormatter.ofPattern(“yyyy-MM-dd HH:mm”); LocalDateTime dateTime = LocalDateTime.parse(str, formatter); Formatting date and … Read more

JSON Java 8 LocalDateTime format in Spring Boot

November 22, 2022 by Tarik

update: Spring Boot 2.x doesn’t require this configuration anymore. I’ve written a more up to date answer here. (This is the way of doing it before Spring Boot 2.x, it might be useful for people working on an older version of Spring Boot) I finally found here how to do it. To fix it, I … Read more

Format LocalDateTime with Timezone in Java8

November 19, 2022 by Tarik

LocalDateTime is a date-time without a time-zone. You specified the time zone offset format symbol in the format, however, LocalDateTime doesn’t have such information. That’s why the error occured. If you want time-zone information, you should use ZonedDateTime. DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern(“yyyyMMdd HH:mm:ss.SSSSSS Z”); ZonedDateTime.now().format(FORMATTER); => “20140829 14:12:22.122000 +09”

Format a date using the new date time API

November 14, 2022 by Tarik

LocalDate represents just a date, not a DateTime. So “HH:mm:ss” make no sense when formatting a LocalDate. Use a LocalDateTime instead, assuming you want to represent both a date and time.

How to convert a LocalDate to an Instant?

November 13, 2022 by Tarik

The Instant class represents an instantaneous point on the time-line. Conversion to and from a LocalDate requires a time-zone. Unlike some other date and time libraries, JSR-310 will not select the time-zone for you automatically, so you must provide it. LocalDate date = LocalDate.now(); Instant instant = date.atStartOfDay(ZoneId.systemDefault()).toInstant(); This example uses the default time-zone of … Read more

LocalDate to java.util.Date and vice versa simplest conversion? [duplicate]

October 25, 2022 by Tarik

tl;dr Is there a simple way to convert a LocalDate (introduced with Java 8) to java.util.Date object? By ‘simple’, I mean simpler than this Nope. You did it properly, and as concisely as possible. java.util.Date.from( // Convert from modern java.time class to troublesome old legacy class. DO NOT DO THIS unless you must, to inter … Read more

How to convert java.sql.timestamp to LocalDate (java8) java.time?

October 25, 2022 by Tarik

You can do: timeStamp.toLocalDateTime().toLocalDate(); Note that timestamp.toLocalDateTime() will use the Clock.systemDefaultZone() time zone to make the conversion. This may or may not be what you want.

Get first and last day of month using threeten, LocalDate

October 24, 2022 by Tarik

Just use withDayOfMonth, and lengthOfMonth(): LocalDate initial = LocalDate.of(2014, 2, 13); LocalDate start = initial.withDayOfMonth(1); LocalDate end = initial.withDayOfMonth(initial.getMonth().length(initial.isLeapYear()));

What’s the difference between ZonedDateTime and OffsetDateTime?

October 20, 2022 by Tarik

Q: What’s the difference between java 8 ZonedDateTime and OffsetDateTime? The javadocs say this: “OffsetDateTime, ZonedDateTime and Instant all store an instant on the time-line to nanosecond precision. Instant is the simplest, simply representing the instant. OffsetDateTime adds to the instant the offset from UTC/Greenwich, which allows the local date-time to be obtained. ZonedDateTime adds … Read more

What is the difference between ZoneOffset.UTC and ZoneId.of(“UTC”)?

October 18, 2022 by Tarik

The answer comes from the javadoc of ZoneId (emphasis mine) … A ZoneId is used to identify the rules used to convert between an Instant and a LocalDateTime. There are two distinct types of ID: Fixed offsets – a fully resolved offset from UTC/Greenwich, that uses the same offset for all local date-times Geographical regions … Read more