在本地仓库中，找到版本对应的 maven-metadata-*.xml 

这里以 maven-metadata-spring-snapshot.xml 为例子

包含了构件的构建信息。

timestamp：快照时间戳

buildNumber：构建次数

lastUpdated：最后一次更新时间

<?xml version="1.0" encoding="UTF-8"?>
<metadata modelVersion="1.1.0">
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>5.2.10.BUILD-SNAPSHOT</version>
  <versioning>
    <snapshot>
      <timestamp>20201023.122514</timestamp>
      <buildNumber>33</buildNumber>
    </snapshot>
    <lastUpdated>20201023123408</lastUpdated>
    <snapshotVersions>
      <snapshotVersion>
        <classifier>javadoc</classifier>
        <extension>jar</extension>
        <value>5.2.10.BUILD-20201023.122514-33</value>
        <updated>20201023122514</updated>
      </snapshotVersion>
      <snapshotVersion>
        <classifier>sources</classifier>
        <extension>jar</extension>
        <value>5.2.10.BUILD-20201023.122514-33</value>
        <updated>20201023122514</updated>
      </snapshotVersion>
      <snapshotVersion>
        <extension>jar</extension>
        <value>5.2.10.BUILD-20201023.122514-33</value>
        <updated>20201023122514</updated>
      </snapshotVersion>
      <snapshotVersion>
        <extension>pom</extension>
        <value>5.2.10.BUILD-20201023.122514-33</value>
        <updated>20201023122514</updated>
      </snapshotVersion>
    </snapshotVersions>
  </versioning>
</metadata>