Polish "Complete support for project.build.outputTimestamp"

See gh-42922

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/intTest/java/org/springframework/boot/maven/BuildInfoIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package org.springframework.boot.maven;
 import java.io.File;
 import java.io.FileReader;
 import java.io.IOException;
+import java.time.Instant;
 import java.util.Properties;
 import java.util.function.Consumer;
 
@@ -85,12 +86,12 @@ class BuildInfoIntegrationTests {
 
 	@TestTemplate
 	void generatedBuildInfoReproducibleEpochSeconds(MavenBuild mavenBuild) {
-		mavenBuild.project("build-info-reproducible-epochseconds")
+		mavenBuild.project("build-info-reproducible-epoch-seconds")
 			.execute(buildInfo((buildInfo) -> assertThat(buildInfo).hasBuildGroup("org.springframework.boot.maven.it")
-				.hasBuildArtifact("build-reproducible-epochseconds")
+				.hasBuildArtifact("build-reproducible-epoch-seconds")
 				.hasBuildName("Generate build info with build time from project.build.outputTimestamp")
 				.hasBuildVersion("0.0.1.BUILD-SNAPSHOT")
-				.hasBuildTime("1976-01-09T12:00:00Z")));
+				.hasBuildTime(Instant.ofEpochSecond(1619004153).toString())));
 	}
 
 	@TestTemplate

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/intTest/projects/build-info-reproducible-epoch-seconds/pom.xml

@@ -3,15 +3,14 @@
 		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.springframework.boot.maven.it</groupId>
-	<artifactId>build-reproducible-epochseconds</artifactId>
+	<artifactId>build-reproducible-epoch-seconds</artifactId>
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<name>Generate build info with build time from project.build.outputTimestamp</name>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<maven.compiler.source>@java.version@</maven.compiler.source>
 		<maven.compiler.target>@java.version@</maven.compiler.target>
-		<!-- Epoch seconds should be support bey build-info plugin too -->
-		<project.build.outputTimestamp>190036800</project.build.outputTimestamp>
+		<project.build.outputTimestamp>1619004153</project.build.outputTimestamp>
 	</properties>
 	<build>
 		<plugins>

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/BuildInfoMojo.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.