How to parse Unix timestamp to date string in Kotlin

Question

How can I parse a Unix timestamp to a date string in Kotlin?

For example 1532358895 to 2018-07-23T15:14:55Z

What did you try so far? The best that comes to my mind is already answered here: https://stackoverflow.com/questions/3371326/java-date-from-unix-timestamp — Roland, Jul 23 '18 at 15:22
@Roland Because that solved the problem for me, and also I wasn't aware you could call pure java libraries from Kotlin like that. However, have changed to the `java.time` method. — Chris Edgington, Dec 04 '18 at 15:57
That's fine. Admittedly I assumed that as known... but good to know... will take that into account in future answers/comments. :-) — Roland, Dec 04 '18 at 16:08

score 26 · Answer 1 · answered Jul 23 '18 at 15:30

26

The following should work. It's just using the Java libraries for handling this:

    val sdf = java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'")
    val date = java.util.Date(1532358895 * 1000)
    sdf.format(date)

answered Jul 23 '18 at 15:30

Erik Pragt

If you can, rather use the classes and utils of `java.time`... even though for such a simple sample it doesn't really matter... – Roland Dec 04 '18 at 12:39
This answer is giving me a wrong date time...The accepted answer gives me the correct date time, but it requires min API 26... – Ramiro G.M. May 04 '23 at 19:03

score 16 · Accepted Answer · answered Jul 24 '18 at 00:37

16

Or with the new Time API:

java.time.format.DateTimeFormatter.ISO_INSTANT
    .format(java.time.Instant.ofEpochSecond(1532358895))

answered Jul 24 '18 at 00:37

jingx

2

I think this answer is much better than the one I provided. Thanks for sharing! – Erik Pragt Jul 25 '18 at 16:18
5

it just that requires API 26 – Ewoks Dec 04 '18 at 10:03

2 Answers2