diff --git a/modules/apps/portal/portal-upgrade-impl/src/main/java/com/liferay/portal/upgrade/internal/report/UpgradeReport.java b/modules/apps/portal/portal-upgrade-impl/src/main/java/com/liferay/portal/upgrade/internal/report/UpgradeReport.java
index dbec42c1a4e5f7..91c41d77d66991 100644
--- a/modules/apps/portal/portal-upgrade-impl/src/main/java/com/liferay/portal/upgrade/internal/report/UpgradeReport.java
+++ b/modules/apps/portal/portal-upgrade-impl/src/main/java/com/liferay/portal/upgrade/internal/report/UpgradeReport.java
@@ -104,7 +104,7 @@ public void generateReport(UpgradeRecorder upgradeRecorder) {
 			_log.info("Starting upgrade report generation");
 		}
 
-		_executionDate = _getExecutionDate();
+		_executionDateString = _getExecutionDateString();
 		_executionTime =
 			(DBUpgrader.getUpgradeTime() / Time.SECOND) + " seconds";
 		_rootDir = _getRootDir();
@@ -136,7 +136,7 @@ private int _getBuildNumber() {
 		return 0;
 	}
 
-	private String _getExecutionDate() {
+	private String _getExecutionDateString() {
 		SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
 			"EEE, MMM dd, yyyy hh:mm:ss z");
 
@@ -211,7 +211,7 @@ private Map<String, Object> _getReportData(
 		Set<String> propertiesFilePathStrings = _getPropertiesFilePathStrings();
 
 		return LinkedHashMapBuilder.<String, Object>put(
-			"execution.date", _executionDate
+			"execution.date", _executionDateString
 		).put(
 			"execution.time", _executionTime
 		).put(
@@ -543,7 +543,7 @@ private Map<String, Object> _getReportDataDiagnostics(
 		UpgradeRecorder upgradeRecorder) {
 
 		return LinkedHashMapBuilder.<String, Object>put(
-			"execution.date", _executionDate
+			"execution.date", _executionDateString
 		).put(
 			"execution.time", _executionTime
 		).put(
@@ -975,7 +975,7 @@ else if (value instanceof Map<?, ?>) {
 
 	private double _dlSize;
 	private final Thread _dlSizeThread = new DLSizeThread();
-	private String _executionDate;
+	private String _executionDateString;
 	private String _executionTime;
 	private final int _initialBuildNumber;
 	private Map<String, Integer> _initialTableCounts;