How to convert date string to timestamp in Kotlin?

Question

I want to convert a date string to unix timestamp from a date string e.g. 14-02-2018

Can someone help?

Look into using `SimpleDateFormat`, or better yet try out the Java 8 date API. — Tim Biegeleisen, Feb 17 '18 at 07:28

score 64 · Answer 1 · answered Feb 17 '18 at 07:49

64

use this to convert the date string to UNIX timestamp

val date = SimpleDateFormat("dd-MM-yyyy").parse("14-02-2018")
println(date.time)

answered Feb 17 '18 at 07:49

Arpan Sarkar

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should only be used if JDK <= 1.7 also note that the formatter is not threadsafe – s1m0nw1 Feb 17 '18 at 09:40

s1m0nw1 · Accepted Answer · 2018-02-17T19:32:01.007

30

Since JDK 8 you can do:

val l = LocalDate.parse("14-02-2018", DateTimeFormatter.ofPattern("dd-MM-yyyy"))

val unix = l.atStartOfDay(ZoneId.systemDefault()).toInstant().epochSecond

Note that the example uses your system's default timezone.

edited Feb 17 '18 at 19:32

answered Feb 17 '18 at 09:29

s1m0nw1

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Note: This only work for SDK 26 and above for lower SDK follow this : https://developer.android.com/studio/write/java8-support#library-desugaring – Mihae Kheel Apr 09 '21 at 05:54

Mihae Kheel · Answer 3 · 2021-04-09T05:56:37.020

5

For backward compatibility use ThreeTenABP library but a better solution from Android itself will be enabling support https://developer.android.com/studio/write/java8-support#library-desugaring

Once enabled you can now parse String date to any valid format pattern

LocalDate.parse(date, DateTimeFormatter.ISO_LOCAL_DATE_TIME).format(
        DateTimeFormatter.ofPattern("MMM. dd, yyyy")

edited Apr 09 '21 at 05:56

answered Apr 08 '21 at 12:19

Mihae Kheel

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How to convert date string to timestamp in Kotlin?

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