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kotlinx-datetime-ext

A Kotlin Multiplatform library that provides kotlinx-datetime extensions and helper functions.

If you've recently switched from java.time APIs to kotlinx-datetime, you've probably noticed that it's missing a lot of functionality that has to be implemented manually. This library comes to close the gap by providing most of java.time's functionalities but in Kotlin!

Supported platforms

• Android
• iOS
• JVM (Desktop)
• Js & WasmJs

Implementation

implementation("com.raedghazal:kotlinx_datetime_ext:1.3.1")

If you're using it in commonMain and want to access it from androidApp, then use api(...) instead to expose it. More about the difference between implementation and api.

Initialization (JS only)

No Initialization is needed, except if you're targeting JS or WasmJS, call Locale.initPlatformLocales(...) in your JS module to setup all the locales you're supporting, default is English Locale only

examples:

1. To support specific Locales

@JsModule("date-fns/locale/pl")
external object DateFnsLocalePl

@JsModule("date-fns/locale/it")
external object DateFnsLocaleIt

Locale.initPlatformLocales(DateFnsLocalePl, DateFnsLocaleIt) // support "pl" and "it" locales

2. To support all Locales

@JsModule("date-fns/locale")
external object DateFnsLocales

Locale.initPlatformLocales(DateFnsLocales) // support all locales 

*This function is only available in the JS module, and it will not be accessible in commonMain .

Usage

1. Math

Add or subtract date or time to a LocalDateTime using operator functions + and - with duration values:

val localDateTime = LocalDateTime(2023, 1, 7, 21, 0)

val afterFiveDays = localDateTime + 5.days
val beforeThreeHours = localDateTime - 3.hours

Or using the DateTimeUnit overload:

val localDateTime = LocalDateTime(2023, 1, 7, 21, 0)

val afterFiveDays = localDateTime.plus(5, DateTimeUnit.DAY)
val beforeThreeHours = localDateTime.minus(3, DateTimeUnit.HOUR)

2. Parsing & Formatting

Formatting to String

val localDateTime = LocalDateTime(2023, 1, 1, 1, 1)
val formatter = LocalDateTimeFormatter.ofPattern("dd/MM/yyyy - HH:mm", Locale.en())

print(formatter.format(localDateTime)) //"01/01/2023 - 01:01"

There are overloads for all date/time objects:

fun format(localDateTime: LocalDateTime): String
fun format(localTime: LocalTime): String
fun format(localDate: LocalDate): String

Parsing from String

val formatter = LocalDateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss", Locale.en())
val localDateTime = formatter.parseToLocalDateTime("2023-01-01 01:01:00") // LocalDateTime(2023, 1, 1, 1, 1)

You can also parse to any date/time object

fun parseToLocalDateTime(str: String): LocalDateTime
fun parseToLocalDate(str: String): LocalDate
fun parseToLocalTime(str: String): LocalTime

Helper extension functions

Transform a LocalDate to a LocalDateTime, you can use atStartOfDay() or atEndOfDay(), similar to java.time:

val localDate = LocalDate(2023, 12, 17).atStartOfDay() //LocalDateTime(2023, 12, 17, 0, 0)
val localDate = LocalDate(2023, 12, 17).atEndOfDay() // LocalDateTime(2023, 12, 17, 23, 59, 59, 999999999)

Get the current date/time:

LocalDateTime.now()
LocalDate.now()
LocalTime.now()

Get minimum/maximum time:

LocalTime.MIN
LocalTime.MAX

Get the Duration between two LocalDateTime objects using the durationUntil infix function:

firstLocalDateTime durationUntil secondLocalDateTime

More examples can be found in the unit tests directory.

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Thank you for using the library, contributions are welcomed!
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