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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)
                I tried to use, but I changed to DateTimeFormatterBuilder and I didn't change val name. Sorry for that.
– beginner992
                Aug 8, 2019 at 10:47
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
                The second one works very well! Thank you so much! Do you know how to add to the names of day and month time from timestamp? For example: Thursday August 10:00?
– beginner992
                Aug 8, 2019 at 11:27
This is really simple
val dateFormated = SimpleDateFormat("dd/MM/yyyy").format(trans.created_date.toDate())
I hope this works for everybody, thanks to https://www.datetimeformatter.com/how-to-format-date-time-in-kotlin/
Method 
fun getAbbreviatedFromDateTime(dateTime: String, dateFormat: String, field: String): String? {
    val input = SimpleDateFormat(dateFormat)
    val output = SimpleDateFormat(field)
    try {
        val getAbbreviate = input.parse(dateTime)    // parse input
        return output.format(getAbbreviate)    // format output
    } catch (e: ParseException) {
        e.printStackTrace()
    return null
*How to use
val monthName=getAbbreviatedFromDateTime("2019-08-07 09:00:00","yyyy-MM-dd HH:mm:ss","MMMM")
    println("monthName--"+monthName)
    val dayOfWeek=getAbbreviatedFromDateTime("2019-08-07 09:00:00","yyyy-MM-dd HH:mm:ss","EEEE")
    println("dayOfWeek--"+dayOfWeek)
To Timemillis
Methods
 fun convertStringToCalendar( timeMillis: Long) {
    //get calendar instance
    val calendarDate = Calendar.getInstance()
    calendarDate.timeInMillis = timeMillis
    val month=getAbbreviatedFromDateTime(calendarDate,"MMMM");
    val day=getAbbreviatedFromDateTime(calendarDate,"EEEE");
    Log.d("parseTesting", month)// prints August
    Log.d("parseTesting",day)// prints Wednesday
fun getAbbreviatedFromDateTime(dateTime: Calendar, field: String): String? {
    val output = SimpleDateFormat(field)
    try {
        return output.format(dateTime.time)    // format output
    } catch (e: Exception) {
        e.printStackTrace()
    return null
 val timestamp = "1565209665".toLong()
    convertStringToCalendar(timestamp)
                Please not. When the questioner is already using Joda-Time (or perhaps java.time), suggesting SimpleDateFormat and Calendar is very bad advice. Those classes are poorly designed, which was why Joda-Time was developed, and they are also long outdated.
– Ole V.V.
                Aug 8, 2019 at 6:48
    "yyyy-MM-dd HH:mm:ss", Locale.ENGLISH
val date = dateFormat_yyyyMMddHHmmss.parse(stringDate)
val calendar = Calendar.getInstance()
calendar.setTime(date)
val dayOfWeekString = calendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.ENGLISH)
Output:
dayOfWeekString : wednesday
val timeInMillis = 1565242471228
val calendar = Calendar.getInstance()
calendar.setTimeInMillis(timeInMillis)
val dayOfWeekString = calendar.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.ENGLISH)
                Please not. When the questioner is already using Joda-Time (or perhaps java.time), suggesting SimpleDateFormat and Calendar is very bad advice. Those classes are poorly designed, which was why Joda-Time was developed, and they are also long outdated.
– Ole V.V.
                Aug 8, 2019 at 6:48
                The questioner used DateTimeFormatterBuilder class, not Joda-Time & DateTimeFormatterBuilder is added in Added in API level 26 & that's why I gave SimpleDateFormat example
– Jignesh Mayani
                Aug 8, 2019 at 7:01
val parsedDate: String? = if(monthOfYear < 10 && dayOfMonth > 10){
                            "${dayOfMonth}/0${monthOfYear + 1}/${year}"
                        } else if(dayOfMonth < 10 && monthOfYear > 10) {
                            "0${dayOfMonth}/${monthOfYear + 1}/${year}"
                        } else if(dayOfMonth < 10 && monthOfYear < 10){
                            "0${dayOfMonth}/0${monthOfYear + 1}/${year}"
                        }else{
                            "0${dayOfMonth}/${monthOfYear + 1}/${year}"
                        date?.text = parsedDate
I tried different things but in Date picker this works for me in kotlin
        
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