diff --git a/hibernate-core/src/main/java/org/hibernate/cache/internal/NoCachingTransactionSynchronizationImpl.java b/hibernate-core/src/main/java/org/hibernate/cache/internal/NoCachingTransactionSynchronizationImpl.java
index 3e24e19c9b..e71a1a3cf6 100644
--- a/hibernate-core/src/main/java/org/hibernate/cache/internal/NoCachingTransactionSynchronizationImpl.java
+++ b/hibernate-core/src/main/java/org/hibernate/cache/internal/NoCachingTransactionSynchronizationImpl.java
@@ -18,6 +18,11 @@ public class NoCachingTransactionSynchronizationImpl implements CacheTransaction
 
 	}
 
+	@Override
+	public long getCurrentTransactionStartTimestamp() {
+		return getCachingTimestamp();
+	}
+
 	@Override
 	public long getCachingTimestamp() {
 		throw new UnsupportedOperationException("Method not supported when 2LC is not enabled");
diff --git a/hibernate-core/src/main/java/org/hibernate/cache/spi/AbstractCacheTransactionSynchronization.java b/hibernate-core/src/main/java/org/hibernate/cache/spi/AbstractCacheTransactionSynchronization.java
index 49c11d29bd..11db5e0fcc 100644
--- a/hibernate-core/src/main/java/org/hibernate/cache/spi/AbstractCacheTransactionSynchronization.java
+++ b/hibernate-core/src/main/java/org/hibernate/cache/spi/AbstractCacheTransactionSynchronization.java
@@ -20,6 +20,12 @@ public abstract class AbstractCacheTransactionSynchronization implements CacheTr
 		this.regionFactory = regionFactory;
 	}
 
+	@Override
+	@Deprecated(forRemoval = true)
+	public long getCurrentTransactionStartTimestamp() {
+		return lastTransactionCompletionTimestamp;
+	}
+
 	@Override
 	public long getCachingTimestamp() {
 		return lastTransactionCompletionTimestamp;
diff --git a/hibernate-core/src/main/java/org/hibernate/cache/spi/CacheTransactionSynchronization.java b/hibernate-core/src/main/java/org/hibernate/cache/spi/CacheTransactionSynchronization.java
index 7f83994e1d..0e5dfad278 100644
--- a/hibernate-core/src/main/java/org/hibernate/cache/spi/CacheTransactionSynchronization.java
+++ b/hibernate-core/src/main/java/org/hibernate/cache/spi/CacheTransactionSynchronization.java
@@ -38,6 +38,24 @@ package org.hibernate.cache.spi;
  * @author Radim Vansa
  */
 public interface CacheTransactionSynchronization {
+
+	/**
+	 * What is the start time of this context object?
+	 *
+	 * @apiNote If not currently joined to a transaction, the timestamp from
+	 * the last transaction is safe to use.  If not ever/yet joined to a
+	 * transaction, a timestamp at the time the Session/CacheTransactionSynchronization
+	 * were created should be returned.
+	 *
+	 * @implSpec This "timestamp" need not be related to timestamp in the Java
+	 * Date/millisecond sense.  It just needs to be an incrementing value.
+	 *
+	 * @deprecated Use {@link CacheTransactionSynchronization#getCachingTimestamp()} instead.
+	 * Please do implement also getCachingTimestamp, as its default implementation will be removed.
+	 */
+	@Deprecated(forRemoval = true)
+	long getCurrentTransactionStartTimestamp();
+
 	/**
 	 * What is the start time of this context object?
 	 *
@@ -51,7 +69,9 @@ public interface CacheTransactionSynchronization {
 	 *
 	 * An UnsupportedOperationException is thrown if 2LC has not enabled
 	 */
-	long getCachingTimestamp();
+	default long getCachingTimestamp() {
+		return getCurrentTransactionStartTimestamp();
+	}
 
 	/**
 	 * Callback that owning Session has become joined to a resource transaction.
diff --git a/hibernate-core/src/main/java/org/hibernate/engine/spi/SessionDelegatorBaseImpl.java b/hibernate-core/src/main/java/org/hibernate/engine/spi/SessionDelegatorBaseImpl.java
index d13ca22417..33e415154a 100644
--- a/hibernate-core/src/main/java/org/hibernate/engine/spi/SessionDelegatorBaseImpl.java
+++ b/hibernate-core/src/main/java/org/hibernate/engine/spi/SessionDelegatorBaseImpl.java
@@ -258,6 +258,12 @@ public class SessionDelegatorBaseImpl implements SessionImplementor {
 		delegate.markForRollbackOnly();
 	}
 
+	@Override
+	@Deprecated(forRemoval = true)
+	public long getTransactionStartTimestamp() {
+		return delegate.getTransactionStartTimestamp();
+	}
+
 	@Override
 	public FlushModeType getFlushMode() {
 		return delegate.getFlushMode();
diff --git a/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionContractImplementor.java b/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionContractImplementor.java
index 418f93407a..7541a2e1e8 100644
--- a/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionContractImplementor.java
+++ b/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionContractImplementor.java
@@ -208,6 +208,18 @@ public interface SharedSessionContractImplementor
 	 */
 	void markForRollbackOnly();
 
+	/**
+	 * A "timestamp" at or before the start of the current transaction.
+	 *
+	 * @apiNote This "timestamp" need not be related to timestamp in the Java Date/millisecond
+	 * sense.  It just needs to be an incrementing value.  See
+	 * {@link CacheTransactionSynchronization#getCurrentTransactionStartTimestamp()}
+	 *
+	 * @deprecated no longer supported, will be removed soon.
+	 */
+	@Deprecated(forRemoval = true)
+	long getTransactionStartTimestamp();
+
 	/**
 	 * The current {@link CacheTransactionSynchronization} associated
 	 * with this session. This may be {@code null} if the session is not
diff --git a/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionDelegatorBaseImpl.java b/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionDelegatorBaseImpl.java
index 17a444e8d4..7fdddb1082 100644
--- a/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionDelegatorBaseImpl.java
+++ b/hibernate-core/src/main/java/org/hibernate/engine/spi/SharedSessionDelegatorBaseImpl.java
@@ -364,6 +364,11 @@ public class SharedSessionDelegatorBaseImpl implements SharedSessionContractImpl
 		delegate.markForRollbackOnly();
 	}
 
+	@Override
+	public long getTransactionStartTimestamp() {
+		return delegate.getTransactionStartTimestamp();
+	}
+
 	@Override
 	public CacheTransactionSynchronization getCacheTransactionSynchronization() {
 		return delegate.getCacheTransactionSynchronization();
diff --git a/hibernate-core/src/main/java/org/hibernate/internal/AbstractSharedSessionContract.java b/hibernate-core/src/main/java/org/hibernate/internal/AbstractSharedSessionContract.java
index a697efcc32..f20bab9c6f 100644
--- a/hibernate-core/src/main/java/org/hibernate/internal/AbstractSharedSessionContract.java
+++ b/hibernate-core/src/main/java/org/hibernate/internal/AbstractSharedSessionContract.java
@@ -513,6 +513,15 @@ public abstract class AbstractSharedSessionContract implements SharedSessionCont
 		return cacheTransactionSync;
 	}
 
+	/**
+	 * @deprecated This will be removed.
+	 */
+	@Override
+	@Deprecated(forRemoval = true)
+	public long getTransactionStartTimestamp() {
+		return getCacheTransactionSynchronization().getCachingTimestamp();
+	}
+
 	@Override
 	public Transaction beginTransaction() {
 		checkOpen();