Merge pull request #12935 from achraftt/BAEL-5791-adaptation

BAEL-5791: Convert String to Instant (creating new module)

core-java-modules/core-java-datetime-string-2/README.md

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+## Java Dates Parsing and Formatting Cookbooks and Examples
+
+This module contains articles about parsing and formatting Java date and time objects.
+
+### Relevant Articles: 
+

core-java-modules/core-java-datetime-string-2/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-datetime-string-2</artifactId>
+    <version>${project.parent.version}</version>
+    <name>core-java-datetime-string-2</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+</project>

core-java-modules/core-java-datetime-string-2/src/test/java/com/baeldung/instant/StringToInstantConverterUnitTest.java

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+package com.baeldung.instant;
+
+import org.junit.Test;
+
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.Locale;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class StringToInstantConverterUnitTest {
+    String stringDate = "09:15:30 PM, Sun 10/09/2022";
+    String pattern = "hh:mm:ss a, EEE M/d/uuuu";
+
+    @Test public void givenStringTimeStamp_whenConvertingWithInstantUsingTimeZone_thenConvertToInstant() {
+        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern, Locale.US);
+        LocalDateTime localDateTime = LocalDateTime.parse(stringDate, dateTimeFormatter);
+        ZoneId zoneId = ZoneId.of("America/Chicago");
+        ZonedDateTime zonedDateTime = localDateTime.atZone(zoneId);
+        Instant instant = zonedDateTime.toInstant();
+        assertThat(instant.toString()).isEqualTo("2022-10-10T02:15:30Z");
+    }
+
+    @Test public void givenStringTimeStamp_whenConvertingWithLocalDateTime_thenConvertToInstant() {
+        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern(pattern, Locale.US);
+        LocalDateTime localDateTime = LocalDateTime.parse(stringDate, dateTimeFormatter);
+        assertThat(localDateTime.toString()).isEqualTo("2022-10-09T21:15:30");
+    }
+}