Convert a String to Date in Kotlin

This post will discuss how to convert a string to a Date in Kotlin.

1. Using `LocalDate.parse()` function

The recommended solution is to use DateTimeFormatter to create a formatter object and pass it to the LocalDate.parse() function with the date string. The java.time.LocalDate is the standard class for representing a date without a time.

import java.time.LocalDate

import java.time.format.DateTimeFormatter

fun main() {

val dateString = "1 January, 2018"

val formatter = DateTimeFormatter.ofPattern("d MMMM, yyyy")

val date = LocalDate.parse(dateString, formatter)

println(date) // 2018-01-01

}

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Alternately, you can use java.time.LocalDateTime to parse a string representing both date and time.

import java.time.LocalDateTime

import java.time.format.DateTimeFormatter

fun main() {

val dateString = "Jan 01 2017, 07:34:27 pm"

val formatter = DateTimeFormatter.ofPattern("MMM dd yyyy, hh:mm:ss a")

val date = LocalDateTime.parse(dateString, formatter)

println(date) // 2017-01-01T19:34:27

}

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2. Using `Instant.parse()` function

If your string represents a valid instant in UTC, you can use the Instant.parse() function to get an java.time.Instant instance. Note that the string is parsed internally using DateTimeFormatter.ISO_INSTANT and can be parsed with a specific time zone:

import java.time.Instant

import java.time.ZoneId

fun main() {

val dateString = "2017-10-15T05:30:00Z"

val timestamp = Instant.parse(dateString)

println(timestamp)

println(timestamp.atZone(ZoneId.of("Australia/Sydney")))

}

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Output:

2017-10-15T05:30:00Z
2017-10-15T11:00+05:30[Asia/Kolkata]

3. Using `SimpleDateFormat` class

Another solution is to use the java.util.SimpleDateFormat class to format and parse dates in Kotlin, which allows you to define your date and time pattern strings for date-time formatting using the standard pattern letters.

import java.text.SimpleDateFormat

fun main() {

val dateString = "01.01.2017"

val formatter = SimpleDateFormat("MM.dd.yyyy")

val date = formatter.parse(dateString)

println(date) // Sun Jan 01 00:00:00 IST 2017

}

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That’s all about converting String to Date in Kotlin.

Convert a String to Date in Kotlin

1. Using LocalDate.parse() function

2. Using Instant.parse() function

3. Using SimpleDateFormat class

Share this:

1. Using `LocalDate.parse()` function

2. Using `Instant.parse()` function

3. Using `SimpleDateFormat` class