How can I convert a Long value to date time and convert current time to Long kotlin?

Question

The Code A can convert a long value to date value, just like 2018.01.10

1. I hope to get Date + Time value , such as 2018.01.10 23:11, how can I do with Kotlin?

2. I hope to convert current time to a long value , how can I do with Kotlin?

Thanks!

Code A

fun Long.toDateString(dateFormat: Int =  DateFormat.MEDIUM): String {
    val df = DateFormat.getDateInstance(dateFormat, Locale.getDefault())
    return df.format(this)
}

Answer 1

Try this, I use SimpleDataFormat.

fun convertLongToTime(time: Long): String {
    val date = Date(time)
    val format = SimpleDateFormat("yyyy.MM.dd HH:mm")
    return format.format(date)
}

fun currentTimeToLong(): Long {
    return System.currentTimeMillis()
}

fun convertDateToLong(date: String): Long {
    val df = SimpleDateFormat("yyyy.MM.dd HH:mm")
    return df.parse(date).time
}

And to convert java file to kotlin file with Android Studio, choosing Code->Convert java file to kotlin file.

Answer 2

No need for anything complex:

Get current time and date as a Date object

val dateTime: Date = Calendar.getInstance().time

Convert it to a Long

val dateTimeAsLong: Long = dateTime.time

Convert that Long back to a Date

val backToDate: Date = Date(dateTimeAsLong)