better timestamp format for active-active (#29329)

akka-persistence-typed/src/main/scala/akka/persistence/typed/internal/Running.scala

@@ -4,10 +4,15 @@
 
 package akka.persistence.typed.internal
 
+import java.time.Instant
+import java.time.LocalDateTime
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
 import java.util.concurrent.atomic.AtomicReference
 
 import scala.annotation.tailrec
 import scala.collection.immutable
+
 import akka.actor.UnhandledMessage
 import akka.actor.typed.eventstream.EventStream
 import akka.actor.typed.{ Behavior, Signal }
@@ -52,7 +57,6 @@ import akka.stream.scaladsl.Keep
 import akka.stream.{ SharedKillSwitch, SystemMaterializer }
 import akka.stream.scaladsl.{ RestartSource, Sink }
 import akka.stream.typed.scaladsl.ActorFlow
-import akka.util.Helpers
 import akka.util.OptionVal
 import akka.util.unused
 import akka.util.Timeout
@@ -174,6 +178,13 @@ private[akka] object Running {
       }
     }
   }
+
+  private val timestampFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS")
+  private val UTC = ZoneId.of("UTC")
+
+  def formatTimestamp(time: Long): String = {
+    timestampFormatter.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(time), UTC))
+  }
 }
 
 // ===============================================
@@ -186,6 +197,7 @@ private[akka] object Running {
   import BehaviorSetup._
   import InternalProtocol._
   import Running.RunningState
+  import Running.formatTimestamp
 
   // Needed for WithSeqNrAccessible, when unstashing
   private var _currentSequenceNumber = 0L
@@ -315,9 +327,9 @@ private[akka] object Running {
         } else {
           if (log.isTraceEnabled)
             log.traceN(
-              "Received published replicated event [{}] with timestamp [{}] from replica [{}] seqNr [{}]",
+              "Received published replicated event [{}] with timestamp [{} (UTC)] from replica [{}] seqNr [{}]",
               Logging.simpleName(event.event.getClass),
-              Helpers.timestamp(event.timestamp),
+              formatTimestamp(event.timestamp),
               originReplicaId,
               event.sequenceNumber)