Not only has it been merged, but now :mega: kotlin...

# kotlinx-datetime

[Dmitry Khalanskiy [JB]]

Not only has it been merged, but now
📣 kotlinx-datetime 0.6.0-RC was published!
Its main change is the new locale-invariant parsing and formatting capabilities. Please try it out and let us know what you think!

[John O'Reilly]

Just looking at converting some expect/actual code to new API....for example

private fun getSessionTime(session: SessionDetails, timeZone: TimeZone): String {
    val dateTimeFormat = LocalDateTime.Format {
        byUnicodePattern("HH:mm")
    }
    return session.startsAt.format(dateTimeFormat)
    //return dateService.format(session.startsAt, timeZone, "HH:mm")
}

just to confirm, there isn't way right now to use timeZone?

[Dmitry Khalanskiy [JB]]

Sorry, you'll have to clarify the question. How do you want to use it?

[John O'Reilly]

hmm, maybe I don't need time zone in this particular case

[John O'Reilly]

is it expected that MMM format doesn't work....this is due to the "locale-invariant" part?

[Dmitry Khalanskiy [JB]]

Yep. If you want English month names specifically, please use monthName(MonthNames.ENGLISH_ABBREVIATED).

[John O'Reilly]

where is that?

[Dmitry Khalanskiy [JB]]

LocalDateTime.Format {
  dayOfMonth()
  char(' ')
  monthName(MonthNames.ENGLISH_ABBREVIATED)
}

Here's the README about defining custom formats: https://github.com/Kotlin/kotlinx-datetime?tab=readme-ov-file#working-with-other-string-formats Using Java pattern strings is discouraged.

[John O'Reilly]

thanks, that worked

[John O'Reilly]

one other small thing....if I want to put a space after the comma below do I need to add another char or is there some other way of doing that?

val confDateFormat = LocalDateTime.Format {
            dayOfMonth()
            char(' ')
            monthName(MonthNames.ENGLISH_ABBREVIATED)
            char(',')
            year()
        }

[Dmitry Khalanskiy [JB]]

chars(", ")

[John O'Reilly]

btw looks like there might be abi compatibility issue with this version.....more details in https://kotlinlang.slack.com/archives/C01A6KM1SBZ/p1709291527353039 cc @bod

[florent]

Hi, thanks for the new features, I tested today and I got a format stored in DB like that 2023-11-26T232206.428362Z[Europe/London] (it was using the java string version before) Do you support that format as well?

[Dmitry Khalanskiy [JB]]

Sure:

val string = "2023-11-26T23:22:06.428362Z[Europe/London]"
val format = DateTimeComponents.Format {
    dateTimeComponents(DateTimeComponents.Formats.ISO_DATE_TIME_OFFSET)
    char('[')
    timeZoneId()
    char(']')
}
format.parse(string).apply {
    check(toLocalDateTime() == LocalDateTime(2023, 11, 26, 23, 22, 6, 428362000))
    check(toUtcOffset() == UtcOffset.ZERO)
    check(timeZoneId == "Europe/London")
    check(toInstantUsingOffset() == LocalDateTime(2023, 11, 26, 23, 22, 6, 428362000).toInstant(UtcOffset.ZERO))
}

[florent]

Perfect thanks, you rock! Maybe we should add this to the readme?

[Dmitry Khalanskiy [JB]]

There's a section about DateTimeComponents in https://github.com/Kotlin/kotlinx-datetime?tab=readme-ov-file#parsing-and-formatting-partial-compound-or-out-of-bounds-data. Is it missing something?

[florent]

I was thinking just to mention the existence of timeZoneId()

[Dmitry Khalanskiy [JB]]

Sure, we can do that. There's more urgent feedback right now, but I've written this suggestion down. Thanks!

[Joel Denke]

Is the intention add Locale support as well, or strictly invariant Locale? :)

[Dmitry Khalanskiy [JB]]

@Joel Denke, https://github.com/Kotlin/kotlinx-datetime/issues/352