How can I change java.util.Date to ISO String using ThreeTenABP

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I'm using ThreeTenABP for converting date time for Android. My question is how can I change a java.util.Date to an ISO String (format is 2018-05-24T02:33:10.062Z) by ThreeTenABP?

A ThreetenABP-solution can look like this:

java.util.Date d = ...;
org.threeten.bp.Instant instant = org.threeten.bp.DateTimeUtils.toInstant(d);
String iso = instant.toString();

If you wish more control over formatting then you can convert the instant to a ZonedDateTime (or better to an OffsetDateTime) and use a dedicated DateTimeFormatter.

DateTimeFormatter (ThreeTen backport 1.4.4 API), A ThreetenABP-solution can look like this: java.util.Date d = ; org.threeten.bp. Instant instant = org.threeten.bp.DateTimeUtils.toInstant(d); String iso = instant. Converting a string to a date in Java (or any programming language) is a fundamental skill and is useful to know when working on projects. Sometimes, it's simply easier to work with a string to represent a date, and then convert it into a Date object for further use. In this article, we'll go over the many methods and libraries you can use to convert a Java string into a date object. The Date

I do not know about android, but if java.text.SimpleDateFormat is available you could do:

new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'").format(new Date())

Package java.time, Returns the ISO date formatter that prints/parses a date with the offset if java. lang.String, format(TemporalAccessor temporal). Formats a date-time object java.util.Set<TemporalField>, getResolverFields(). Gets the resolver fields to use � 0 How can I change java.util.Date to ISO String using ThreeTenABP Dec 31 '19 0 Using static variables in Spring annotations Apr 7 0 Custom JQuery inputmask including time Aug 28 '19

Expression:

new Date().toInstant().toString()

results in

2019-12-31T06:32:37.997Z

java, A date-time with an offset from UTC/Greenwich in the ISO-8601 calendar system, such as ZonedDateTime is the closest equivalent class to java.util. Thus, the set of date-time types provided is a compromise between purity and practicality. Questions: I am trying to convert an ISO 8601 formatted String to a java.util.Date. I found the pattern “yyyy-MM-dd’T’HH:mm:ssZ” to be ISO8601-compliant if used with a Locale (compare sample). However, using the java.text.SimpleDateFormat, I cannot convert the correctly formatted String “2010-01-01T12:00:00+01:00”.

Convert Date to ISO 8601 String in Java, 我正在使用ThreeTenABP转换Android的日期时间。 我的问题是如何 How can I change java.util.Date to ISO String using ThreeTenABP. ISO 8601. Your input string complies with the ISO 8601 standard for formatting strings representing date-time values. The java.time classes use the standard formats by default when parsing/generating strings, so no need to specify a formatting pattern. The Z on the end is short for Zulu and means UTC.

Converting a String to Java Date in ISO 8601 date-time format , Convert Java dates to ISO-8601 string: this post explains how to convert java.util. Date, java.util.Calendar, java.time.ZonedDateTime to string. I'm a little bit frustrated of java 8 date format/parse functionality. I was trying to find Jackson configuration and DateTimeFormatter to parse "2018-02-13T10:20:12.120+0000" string to any Java 8 date, and didn't find it. This is java.util.Date example which works fine:

How can I extract the week number from java.util.Date in scala, I am trying to convert a string into an ISO 8601 date-time format. Never use SimpleDateFormat , Date , Calendar , etc. For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). You may want to store just a string of the date, in ISO 8601 format of YYYY-MM-DD. Or use a LocalDate object from Joda-Time (see below). Joda-Time. First thing to learn in Java: Avoid the notoriously troublesome java.util.Date & java.util.Calendar classes bundled with Java. As correctly noted in the answer by user3277382, use either Joda-Time

Comments
  • You save my day too. That's more relevant answer for my question
  • @OleV.V. I agree that using a fixed offset and hence the type OffsetDateTime is here the natural choice. Have adjusted the answer accordingly.
  • Currently ur answer suitable for me. But I also need with threetenabp
  • Escaping the pattern letter "Z" is a heavy mistake resulting in wrong data. But using the pattern letter "X" is a good alternative.
  • There is a way through to getting the string with correct time and the Z with SimpleDateFormat (at least if your Android API level is high enough), but it’s not straightforward. Since SimpleDateFormat is both outdated and notoriously troublesome, I’d rather not bother, and would use the good answer by Meno Hochschild instead.
  • yes, of course it is better to set a timezone on the format. next time i'll be more cautious when posting answers.