Open swuecho opened 8 months ago
In Scala 3, you can create a custom given instance for encoding java.time.LocalDateTime
instances using Circe. Here's an example:
import io.circe._
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter
object LocalDateTimeEncoders {
given Encoder[LocalDateTime] with {
val formatter: DateTimeFormatter = DateTimeFormatter.ISO_LOCAL_DATE_TIME
override def apply(a: LocalDateTime): Json = Json.fromString(formatter.format(a))
}
}
In this example, we define a given instance of Encoder
for java.time.LocalDateTime
. Inside the given block, we define a DateTimeFormatter
to format the LocalDateTime
and then use it to convert the LocalDateTime
instance to a String
representation, which is then wrapped in a Json
object using Json.fromString
.
To use this custom encoder, you can import it alongside the rest of your Circe code and Circe will use it automatically when encountering LocalDateTime
instances during encoding.
You can create a custom encoder for handling
java.util.Date
instances in Circe by utilizing theEncoder
type class from the Circe library. Here's an example:In this example, we create a custom encoder for
java.util.Date
instances by implicitly defining anEncoder[Date]
. Inside theEncoder
instance, we define aSimpleDateFormat
to format the date and then use it to convert theDate
instance to aString
representation, which is then wrapped in aJson
object usingJson.fromString
.To use this custom encoder, you can import it alongside the rest of your Circe code and Circe will use it automatically when encountering
Date
instances during encoding.