feat: add ...timestamp.iso placeholder

README.md

@@ -221,6 +221,7 @@ e.g `${dirty:+SNAPSHOT}` resolves to `-SNAPSHOT` instead of `-DIRTY`
 - `${commit.timestamp.minute}` commit minute of hour e.g. '59'
 - `${commit.timestamp.second}` commit second of minute e.g. '30'
 - `${commit.timestamp.datetime}` commit timestamp formatted as `yyyyMMdd.HHmmss`e.g. '20190616.161442'
+- `${commit.timestamp.iso}` commit timestamp formatted as `yyyy-MM-ddTHH:mm:ssZ`e.g. '2019-06-16T16:14:42Z'
       <br><br>
 
 - `${build.timestamp}` maven-build-timestamp (epoch seconds) e.g. '1560694278'
@@ -232,6 +233,7 @@ e.g `${dirty:+SNAPSHOT}` resolves to `-SNAPSHOT` instead of `-DIRTY`
 - `${build.timestamp.minute}` maven-build-timestamp minute of hour e.g. '59'
 - `${build.timestamp.second}` maven-build-timestamp second of minute e.g. '30'
 - `${build.timestamp.datetime}` maven-build-timestamp formatted as `yyyyMMdd.HHmmss`e.g. '20190616.161442'
+- `${build.timestamp.iso}` commit timestamp formatted as `yyyy-MM-ddTHH:mm:ssZ`e.g. '2019-06-16T16:14:42Z'
      <br><br>
 
 - `${describe}` Will resolve to `git describe` output

src/main/java/me/qoomon/maven/gitversioning/GitVersioningModelProcessor.java

@@ -900,7 +900,9 @@ private Map<String, Supplier<String>> generateGlobalFormatPlaceholderMap(GitSitu
         placeholderMap.put("commit.timestamp.minute", Lazy.by(() -> leftPad(String.valueOf(headCommitDateTime.get().getMinute()), 2, "0")));
         placeholderMap.put("commit.timestamp.second", Lazy.by(() -> leftPad(String.valueOf(headCommitDateTime.get().getSecond()), 2, "0")));
         placeholderMap.put("commit.timestamp.datetime", Lazy.by(() -> headCommitDateTime.get().toEpochSecond() > 0
-                ? headCommitDateTime.get().format(DateTimeFormatter.ofPattern("yyyyMMdd.HHmmss")) : "00000000.000000"));
+                ? headCommitDateTime.get().format(DateTimeFormatter.ofPattern("yyyyMMdd.HHmmss")) : "00000101.000000"));
+        placeholderMap.put("commit.timestamp.iso", Lazy.by(() -> headCommitDateTime.get().toEpochSecond() > 0
+                ? headCommitDateTime.get().format(DateTimeFormatter.ISO_INSTANT) : "0000-01-01T00:00:00Z"));
 
         final Lazy<ZonedDateTime> buildCommitDateTime = Lazy.by(() -> mavenSession.getStartTime().toInstant().atZone(ZoneId.systemDefault()));
         placeholderMap.put("build.timestamp", Lazy.by(() -> String.valueOf(buildCommitDateTime.get().toEpochSecond())));
@@ -913,6 +915,8 @@ private Map<String, Supplier<String>> generateGlobalFormatPlaceholderMap(GitSitu
         placeholderMap.put("build.timestamp.second", Lazy.by(() -> leftPad(String.valueOf(buildCommitDateTime.get().getSecond()), 2, "0")));
         placeholderMap.put("build.timestamp.datetime", Lazy.by(() -> buildCommitDateTime.get().toEpochSecond() > 0
                 ? buildCommitDateTime.get().format(DateTimeFormatter.ofPattern("yyyyMMdd.HHmmss")) : "00000000.000000"));
+        placeholderMap.put("build.timestamp.iso", Lazy.by(() -> buildCommitDateTime.get().toEpochSecond() > 0
+                ? headCommitDateTime.get().format(DateTimeFormatter.ISO_INSTANT) : "0000-01-01T00:00:00Z"));
 
         final String refName = gitVersionDetails.getRefName();
         final Lazy<String> refNameSlug = Lazy.by(() -> slugify(refName));