How to format in Kotlin date in string or timestamp to my preferred format?

Question

I'm getting date data from weather API in two versions. The first one is just string like this: 2019-08-07 09:00:00 and like this: 1565209665. How do I change it to just the name of the day or day and month? For example Monday, August.

I tried something like this in few configurations but it works only in full version. If I cat something then it throws an error:

    var date = list.get(position).dt_txt
    val formatter = DateTimeFormatterBuilder()
        .appendPattern("yyyy-MM-dd HH:mm:ss").toFormatter()
    formatter.parse(date)

Answer 1

First API format:

val firstApiFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")
val date = LocalDate.parse("2019-08-07 09:00:00" , firstApiFormat)

Log.d("parseTesting", date.dayOfWeek.toString()) // prints Wednesday
Log.d("parseTesting", date.month.toString()) // prints August

Second API format:

val secondApiFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss'Z'")
val timestamp = 1565209665.toLong() // timestamp in Long


val timestampAsDateString = java.time.format.DateTimeFormatter.ISO_INSTANT
            .format(java.time.Instant.ofEpochSecond(timestamp))

Log.d("parseTesting", timestampAsDateString) // prints 2019-08-07T20:27:45Z


val date = LocalDate.parse(timestampAsDateString, secondApiFormat)

Log.d("parseTesting", date.dayOfWeek.toString()) // prints Wednesday
Log.d("parseTesting", date.month.toString()) // prints August