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BAEL-5386: Format Instant to String in Java (#11970) 

* first commit

* remove extra spaces

* add the requested changes
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Azhwani 2022-04-01 03:04:10 +02:00 committed by GitHub
parent 2dd4d435ab
commit b1c60e9093
1 changed files with 54 additions and 0 deletions
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core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatinstant/FormatInstantUnitTest.java Normal file
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package com.baeldung.formatinstant;
import static org.assertj.core.api.Assertions.assertThat;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.UnsupportedTemporalTypeException;
import org.joda.time.format.DateTimeFormat;
import org.junit.Test;
public class FormatInstantUnitTest {
private static final String PATTERN_FORMAT = "dd.MM.yyyy";
@Test
public void givenInstant_whenUsingDateTimeFormatter_thenFormat() {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(PATTERN_FORMAT)
.withZone(ZoneId.systemDefault());
Instant instant = Instant.parse("2022-02-15T18:35:24.00Z");
String formattedInstant = formatter.format(instant);
assertThat(formattedInstant).isEqualTo("15.02.2022");
}
@Test(expected = UnsupportedTemporalTypeException.class)
public void givenInstant_whenNotSpecifyingTimeZone_thenThrowException() {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(PATTERN_FORMAT);
Instant instant = Instant.now();
formatter.format(instant);
}
@Test
public void givenInstant_whenUsingToString_thenFormat() {
Instant instant = Instant.ofEpochMilli(1641828224000L);
String formattedInstant = instant.toString();
assertThat(formattedInstant).isEqualTo("2022-01-10T15:23:44Z");
}
@Test
public void givenInstant_whenUsingJodaTime_thenFormat() {
org.joda.time.Instant instant = new org.joda.time.Instant("2022-03-20T10:11:12");
String formattedInstant = DateTimeFormat.forPattern(PATTERN_FORMAT)
.print(instant);
assertThat(formattedInstant).isEqualTo("20.03.2022");
}
}