kotlinlang #kotlinx-datetime

What's the plan for more time types? I consistently find myself in the situation of creating new time types myself like LocalTime, MonthDay etc. As a full replacement for the java time operations the library feels really half baked.

➕ 4

Nikita Khlebushkin

07/16/2021, 6:12 PM

Hello! I am having some strange bug:

java.lang.NoSuchFieldError: No field MIN of type Lj$/time/Instant; in class Lj$/time/Instant; or its superclasses (declaration of 'j$.time.Instant' appears in /data/app/my.app-Rumayx4kmF4yH-665uzCBw==/base.apk!classes2.dex)
        at kotlinx.datetime.Instant.<clinit>(Instant.kt:96)
        at kotlinx.datetime.Clock$System.now(Clock.kt:17)

The line where it happens:

val fetchStartEpoch = clock.now().toEpochMilliseconds()

I tried with datetime 0.1.1 and 0.2.1, same result. Another interesting detail is that it only happened after I added

compileOptions {
        isCoreLibraryDesugaringEnabled = true
    }

I had to add it after the library started to crash on Android 26. Any clues how I can deal with it?

Imran/Malic

08/22/2021, 2:10 PM

Hi all, is UtcOffset the equivalent of

OffsetDateTime

? And is there a snapshot release somewhere?

Nick

08/26/2021, 9:16 PM

I’d like to convert an ISO string to a readable format the end user would understand. I can’t seem to find how to do it with Date-Time. Am I missing something? This would go in a ViewModel, which I intend on making multiplatform.

Desmond van der Meer

08/31/2021, 6:39 AM

Hi, I'm having a problem with my unit tests when running them in JavaScript. I'm using

TimeZone.of("Europe/Amsterdam")

, but that is not recognized during unit tests in JS (a

IllegalTimeZoneException

is thrown), presumably because it can't find some asset/resource with time zone information? Is this a known issue, does anyone know how to solve this? The time zone can be found without problem when I run the code normally

Yang

09/08/2021, 10:52 AM

👋 are there plans to add Apple silicon targets? https://github.com/Kotlin/kotlinx-datetime/issues/141

➕ 7

Zhiqiang Bian

09/28/2021, 6:48 PM

Hi all! I am using

kotlinx-datetime

for KMM development. In my

androidApp/build.gradle.kts

, if I set

debuggable

true

, then it works well. But if I set

debuggable

false

(for release), the app will crash immediately when executing any

kotlinx-datetime

code (in common folder). Does anyone know the reason?

✅ 1

chi

12/07/2021, 8:07 PM

Hello all, is there a way to directly parse a date string in this format; "MM/dd/yyyy HH🇲🇲ss" using Kotlin Date time?

LocalDateTime

Instant

string parsing methods fail

jim

12/13/2021, 9:36 AM

Hey! I'm trying to add https://github.com/Kotlin/kotlinx-datetime to my kotlinjs project, but I'm getting errors related to joda-timezone. I've added

implementation(npm("@js-joda/timezone", "2.3.0"))

to my

jsMain

dependencies, and also added a block to the beginning of my

Main.kt

file:

@JsModule("@js-joda/timezone")
@JsNonModule
external object JsJodaTimeZoneModule

private val jsJodaTz = JsJodaTimeZoneModule

I build with

jsBrowserDistribution

but if I look at the build output javascript file, the very first few lines are:

(function (root, factory) {
  if (typeof define === 'function' && define.amd)
    define(['exports', '@js-joda/timezone', '@js-joda/core'], factory);
  else if (typeof exports === 'object')
    factory(module.exports, require('@js-joda/timezone'), require('@js-joda/core'));
  else {
    if (typeof JsJodaTimeZoneModule === 'undefined') {
      throw new Error("Error loading module 'turntaker-js'. Its dependency '@js-joda/timezone' was not found. Please, check whether '@js-joda/timezone' is loaded prior to 'turntaker-js'.");
    }if (typeof this['@js-joda/core'] === 'undefined') {
      throw new Error("Error loading module 'turntaker-js'. Its dependency '@js-joda/core' was not found. Please, check whether '@js-joda/core' is loaded prior to 'turntaker-js'.");
    }root['turntaker-js'] = factory(typeof this['turntaker-js'] === 'undefined' ? {} : this['turntaker-js'], JsJodaTimeZoneModule, this['@js-joda/core']);
  }
}(this, function (_, JsJodaTimeZoneModule, $module$_js_joda_core) {

which would seem to imply that the JsJodaTimeZoneModule is not being included, or certainly not being included prior to the check running

Tristan

12/15/2021, 6:59 PM

Hello, I have a Kotlin/JS project only (not multiplatform) where I import the library like this:

plugins {
    kotlin("js") version "1.5.10"
}

repositories {
    mavenCentral()
}

kotlin {
    js(IR) {
        binaries.executable()
        browser()
    }

    sourceSets {
        val main by getting {
            dependencies {
                implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.1")
            }
        }
    }
}

But when I try to compile, I get this error

> Task :compileKotlinJs FAILED
e: java.lang.AssertionError: Built-in class kotlin.Unit is not found

How should I import this? Thanks for your help.

ptsiogas

01/24/2022, 3:42 PM

Hi there, it’s been over a year since this post. Is there any way to do what is being described?

👀 1

jean

01/26/2022, 10:21 AM

Jean Tuffier [11:15 AM] Is there a way to convert a string from utc time zone like this

2021-11-29T23:00:00.000+0000

to it’s equivalent in another time zone? I tried this :

internal fun String.localDateTime(): LocalDateTime = Instant.parseWithBasicOffset(this) //parseWithBasicOffset is a custom parse due to time zone written without ":" 
    .toLocalDateTime(TimeZone.currentSystemDefault())

but

myString.localDateTime().toString()

returns

2021-11-30T00:00

the date is correct but I lost the time zone there, which I need for further processing. So my question is : how do I go from

2021-11-29T23:00:00.000+0000

2021-11-30T00:00:00.000+0100

(or eventually

+01:00

)

jean

02/14/2022, 2:20 PM

let’s say I want the value of “yesterday”, I can do something like this :

Clock.System.now()
    .minus(1, DateTimeUnit.DAY, TimeZone.of(timeZoneId))

I just realized that

now

is also relative to my personal timezone, isn’t? I could ask for the now value of japan for example, which is way different that mine. So why doesn’t

now

take a Timezone parameter? Or did I miss something?

brabo-hi

02/17/2022, 6:56 AM

Hi all i have received a weird crash error when invoking

Clock.System.now()

Fatal Exception: java.lang.NoClassDefFoundError
kotlinx.datetime.Instant
kotlinx.datetime.Clock$System.now (Clock.kt:17)

mkrussel

02/24/2022, 8:05 PM

Why are all the releases listed on GItHub prereleases? It makes it seem like they should not be used.

andylamax

03/23/2022, 11:47 AM

Can we please Mark

LocalDate

LocalDateTime

and

Instant

with

@JsExport

, At the moment, we can't use it

Konstantin Zolotov

04/22/2022, 2:50 PM

Hello there! Probably stupid question, but search doesn’t give me an answer unfortunately. Is there a simple way to clamp

LocalDateTime

to the beginning of the day? So far I see only the option

localDateTime.date.atTime(0, 0)

, is this the way? :mandalorian:

Paul Woitaschek

05/05/2022, 9:31 AM

What’s the motivation that datetime 0.3.3 now targets a beta kotlin release? This causes bugs from the kotlin beta preventing us from updating kotlinx date time

> Task :uniqueId:linkDebugTestIosSimulatorArm64 FAILED
e: Compilation failed: Unexpected IrType kind: KIND_NOT_SET

 * Source files: 
 * Compiler version info: Konan: 1.6.21 / Kotlin: 1.6.21
 * Output kind: STATIC_CACHE

e: java.lang.IllegalStateException: Unexpected IrType kind: KIND_NOT_SET

👀 1

🤷‍♂️ 1

Dmitry Khalanskiy [JB]

06/24/2022, 1:49 PM

📣 📣 📣 kotlinx.datetime 0.4.0 is here! The highlight:

LocalTime

, a representation of time-of-day, is now provided (a contribution by https://github.com/bishiboosh).

❤️ 3

👍 6

Akram Bensalem

06/28/2022, 11:28 AM

Hello, The current time is always with "06" minutes !!! Is this a bug ?

✅ 1

Akram Bensalem

07/19/2022, 1:36 PM

How to specify the language of the return value of this:

val date = DateTimeFormatter
    .ofPattern(pattern)
    .withZone(zoneId)
    .format(date.toJavaInstant())

I don't want it to return the default language of the system

kevin.cianfarini

07/27/2022, 4:38 PM

is there any reason

Clock

isn’t a

fun interface

humblehacker

08/12/2022, 8:52 PM

Given a

LocalDate

, how do I format it as a localized string?

java.time.LocalDate()

has a

format()

method, but the kotlinx version doesn't, and so far my google searches are unsuccessful.

kevin.cianfarini

08/17/2022, 1:22 PM

Should serializing a FixedOffsetTimeZone like

TimeZone.UTC

just yield a

'Z'

? This was violating a backend contract we have and took me by surprise. Doing

TimeZone.of("UTC")

fixed this.

andylamax

08/24/2022, 7:43 AM

Is the team accepting pull requests?? I wish to submit one. But I see here there are un merged pull requests which where submitted since July 2021. Is it worth it? or just a waster of time?

Vsevolod Tolstopyatov [JB]

10/19/2022, 4:15 PM

We’ve initiated the discussion about zoned date times: https://github.com/Kotlin/kotlinx-datetime/discussions/237 Feel free to participate!

Dragos Rachieru

10/24/2022, 11:55 AM

Hello, how can I get units from an instant? Like

instant.get(DateTimeUnit.HOUR)

romainbsl

11/14/2022, 9:39 AM

Hi, any idea why embedded linuxes are not supported by KX DateTime ? https://github.com/Kotlin/kotlinx-datetime/issues/165

farmerbb

11/23/2022, 8:24 PM

Does kotlinx.datetime have a multiplatform equivalent for

java.time.format.DateTimeFormatter

Stylianos Gakis

12/14/2022, 12:27 PM

Does the library offer some way to run tests with a test instance of the

Clock

interface? Basically one where I can control the time passed myself. Basically I’m trying to run a test where two classes receive a Clock instance, current just passing in Clock.System in, but then

now()

resolves two different times but I want for the test for them to resolve on the same now. I can probably make my own Clock instance where I just always return the same Instance, but just checking if there’s some existing artifact which gives a nice test Clock instance with some more control than what I’d do myself.

Title

Stylianos Gakis

12/14/2022, 12:27 PM

Does the library offer some way to run tests with a test instance of the

Clock

interface? Basically one where I can control the time passed myself. Basically I’m trying to run a test where two classes receive a Clock instance, current just passing in Clock.System in, but then

now()

Dmitry Khalanskiy [JB]

12/14/2022, 12:33 PM

Nothing official is provided, but this probably should be fairly straightforward to implement, no?

public class TestClock: Clock {
    private var now: Instant = Clock.System.now()

    public fun advanceTimeBy(duration: Duration) {
        require(duration > Duration.ZERO)
        now += duration
    }

    override fun now(): Instant = now
}

Stylianos Gakis

12/14/2022, 12:39 PM

Yeap this is pretty much what I had written myself too (minus the require step, which is smart 😅) I was simply wondering if there was something somewhere that I missed, but I understand why there’s not atm. Thanks for the help 🤗

hfhbd

12/14/2022, 2:58 PM

Alternative if you want to sync your clock with

runTest

and its `testTimeSource`:

@ExperimentalTime
 public fun TimeSource.toClock(offset: Instant = Instant.fromEpochSeconds(0)): Clock = object : Clock {
     private val startMark: TimeMark = markNow()
     override fun now() = offset + startMark.elapsedNow()
 }

Stylianos Gakis

12/14/2022, 3:01 PM

Ohh interesting yeah I might need that in the future, thanks!

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