Hey, does anyone know how I can parse 2022-05-20T1...

# server

[Kristian Nedrevold]

Hey, does anyone know how I can parse 2022-05-20T193627Z with kotlinx-datetime?

[jw]

Do it manually? ISO 8601 is pretty straightforward. Substring+toInt will get you very far. Even regex will work.

[jw]

Pull out each number, validate the divider characters, parse each number, call the factory function for the type you want with the values

[Richard Gomez]

"2010-06-01T22:19:44.475Z".toInstant()

?
https://github.com/Kotlin/kotlinx-datetime#converting-instant-and-local-datetime-to-and-from-string

[jw]

even better. i guess when it's always UTC you don't need a timezone database!

[Richard Gomez]

All hail UTC.

[Richard Gomez]

On a serious note, I am merely pointing @Kristian Nedrevold in the direction of the README. "".toInstant() is one option, but there are many more waiting to be discovered.

[Kristian Nedrevold]

I am trying to use it with kotlinx serialization to serialize a Json response body. What I ended up doing was just parsing it to string when receiving the object and then parsing it to LocalDateTime using "".toInstant() later. I Don't know if this is the best/most corrrect way to do it though. Maybe I should write a custom serializer that parses it correctly when receiving the body? Thanks for the tip @Richard Gomez.

[jw]

A custom serializer is the way to go

[Kristian Nedrevold]

Yeah, I expected as much. I just write a custom serializer and annotate the field with @Serializable(with = MyCustomSerializer) then?

[phldavies]

kotlinx-datetime includes serializers (https://github.com/Kotlin/kotlinx-datetime/blob/master/core/common/src/serializers/InstantSerializers.kt) so you likely only need to annotate the property with @Serializable(with = InstantIso8601Serializer::class)

[Kristian Nedrevold]

@phldavies That works! Thanks a lot :)