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 = Calendar.getInstance().time // Date 

Convert it to a Long

val dateTimeAsLong = dateTime.time // Long 

Convert that Long back to a Date

val backToDate = Date(dateTimeAsLong) // Date