diff --git a/iwf-idl b/iwf-idl
index 651a3dd0..ea8e882a 160000
--- a/iwf-idl
+++ b/iwf-idl
@@ -1 +1 @@
-Subproject commit 651a3dd0f157bd5a9e4f7a78bed66218a071ef8d
+Subproject commit ea8e882af5cb0a5ced9fd5374ce1696a3d9e6b87
diff --git a/src/main/java/io/iworkflow/core/command/TimerCommand.java b/src/main/java/io/iworkflow/core/command/TimerCommand.java
index 15d55e0e..2eb8333a 100644
--- a/src/main/java/io/iworkflow/core/command/TimerCommand.java
+++ b/src/main/java/io/iworkflow/core/command/TimerCommand.java
@@ -7,18 +7,18 @@
 @Value.Immutable
 public abstract class TimerCommand implements BaseCommand {
 
-    public abstract int getFiringUnixTimestampSeconds();
+    public abstract long getDurationSeconds();
 
     public static TimerCommand createByDuration(String commandId, Duration duration) {
         return ImmutableTimerCommand.builder()
                 .commandId(commandId)
-                .firingUnixTimestampSeconds((int) (System.currentTimeMillis() / 1000 + duration.getSeconds()))
+                .durationSeconds(duration.getSeconds())
                 .build();
     }
 
     public static TimerCommand createByDuration(Duration duration) {
         return ImmutableTimerCommand.builder()
-                .firingUnixTimestampSeconds((int) (System.currentTimeMillis() / 1000 + duration.getSeconds()))
+                .durationSeconds(duration.getSeconds())
                 .build();
     }
 }
\ No newline at end of file
diff --git a/src/main/java/io/iworkflow/core/mapper/TimerCommandMapper.java b/src/main/java/io/iworkflow/core/mapper/TimerCommandMapper.java
index 833a3ff6..dfaad86f 100644
--- a/src/main/java/io/iworkflow/core/mapper/TimerCommandMapper.java
+++ b/src/main/java/io/iworkflow/core/mapper/TimerCommandMapper.java
@@ -5,7 +5,7 @@
 public class TimerCommandMapper {
     public static TimerCommand toGenerated(io.iworkflow.core.command.TimerCommand timerCommand) {
         final TimerCommand command = new TimerCommand()
-                .firingUnixTimestampSeconds((long) timerCommand.getFiringUnixTimestampSeconds());
+                .durationSeconds(timerCommand.getDurationSeconds());
         if (timerCommand.getCommandId().isPresent()) {
             command.commandId(timerCommand.getCommandId().get());
         }