diff --git a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/repositories/mission/IRpnExportRepository.kt b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/repositories/mission/IRpnExportRepository.kt
index b94c8f36..c19a3f8e 100644
--- a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/repositories/mission/IRpnExportRepository.kt
+++ b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/repositories/mission/IRpnExportRepository.kt
@@ -2,14 +2,12 @@ package fr.gouv.dgampa.rapportnav.domain.repositories.mission
 
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.crew.MissionCrewEntity
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.export.MissionExportEntity
-import java.time.LocalDate
-import java.time.ZonedDateTime
 
 data class ExportParams(
     val service: String?,
     val id: String,
-    val startDateTime: ZonedDateTime?,
-    val endDateTime: ZonedDateTime?,
+    val startDateTime: String?,
+    val endDateTime: String?,
     val presenceMer: Map<String, Int>,
     val presenceQuai: Map<String, Int>,
     val indisponibilite: Map<String, Int>,
@@ -21,7 +19,7 @@ data class ExportParams(
     val goMarine: Float?,
     val essence: Float?,
     val crew: List<MissionCrewEntity>,
-    val timeline: Map<LocalDate, List<String>>?
+    val timeline: Map<String, List<String>>?
 )
 
 interface IRpnExportRepository {
diff --git a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/action/GroupActionByDate.kt b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/action/GroupActionByDate.kt
index 3b17a5f5..056881c7 100644
--- a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/action/GroupActionByDate.kt
+++ b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/action/GroupActionByDate.kt
@@ -2,16 +2,21 @@ package fr.gouv.dgampa.rapportnav.domain.use_cases.mission.action
 
 import fr.gouv.dgampa.rapportnav.config.UseCase
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.MissionActionEntity
-import java.time.LocalDate
 
 @UseCase
 class GroupActionByDate {
-    fun execute(actions: List<MissionActionEntity>?): Map<LocalDate, List<MissionActionEntity>>? {
+    fun execute(actions: List<MissionActionEntity>?): Map<String, List<MissionActionEntity>>? {
         return actions?.groupBy { action ->
             when (action) {
-                is MissionActionEntity.EnvAction -> action.envAction?.controlAction?.action?.actionStartDateTimeUtc?.toLocalDate()
-                is MissionActionEntity.FishAction -> action.fishAction.controlAction?.action?.actionDatetimeUtc?.toLocalDate()
-                is MissionActionEntity.NavAction -> action.navAction.startDateTimeUtc.toLocalDate()
+                is MissionActionEntity.EnvAction -> action.envAction?.controlAction?.action?.actionStartDateTimeUtc?.takeIf { true }
+                    ?.toLocalDate().toString()
+
+                is MissionActionEntity.FishAction -> action.fishAction.controlAction?.action?.actionDatetimeUtc?.takeIf { true }
+                    ?.toLocalDate().toString()
+
+                is MissionActionEntity.NavAction -> action.navAction.startDateTimeUtc.takeIf { true }
+                    ?.toLocalDate().toString()
+
                 else -> null // Handle other types of actions, if any
             }
         }?.mapNotNull { (date, actions) ->
diff --git a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/ExportMission.kt b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/ExportMission.kt
index c8251805..c6a4ac43 100644
--- a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/ExportMission.kt
+++ b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/ExportMission.kt
@@ -49,8 +49,8 @@ class ExportMission(
             val exportParams = ExportParams(
                 service = mission.openBy,
                 id = "pam" + mission.id,
-                startDateTime = mission.startDateTimeUtc,
-                endDateTime = mission.endDateTimeUtc,
+                startDateTime = mission.startDateTimeUtc.toString(),
+                endDateTime = mission.endDateTimeUtc?.toString(),
                 presenceMer = durations["atSeaDurations"].orEmpty(),
                 presenceQuai = durations["dockingDurations"].orEmpty(),
                 indisponibilite = durations["unavailabilityDurations"].orEmpty(),
diff --git a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/FormatActionsForTimeline.kt b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/FormatActionsForTimeline.kt
index 71b9177d..9c2a06b0 100644
--- a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/FormatActionsForTimeline.kt
+++ b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/domain/use_cases/mission/export/FormatActionsForTimeline.kt
@@ -5,10 +5,12 @@ import fr.gouv.dgampa.rapportnav.domain.entities.mission.MissionActionEntity
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.env.envActions.EnvActionControlEntity
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.fish.fishActions.InfractionType
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.fish.fishActions.MissionAction
-import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.action.*
+import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.action.ActionControlEntity
+import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.action.ActionFreeNoteEntity
+import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.action.ActionStatusEntity
+import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.action.ActionType
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.status.mapActionStatusTypeToHumanString
 import fr.gouv.dgampa.rapportnav.domain.use_cases.mission.action.GroupActionByDate
-import java.time.LocalDate
 import java.time.ZonedDateTime
 
 @UseCase
@@ -16,7 +18,7 @@ class FormatActionsForTimeline(
     private val groupActionByDate: GroupActionByDate,
 ) {
 
-    fun formatTimeline(actions: List<MissionActionEntity>?): Map<LocalDate, List<String>>? {
+    fun formatTimeline(actions: List<MissionActionEntity>?): Map<String, List<String>>? {
 
         if (actions.isNullOrEmpty()) {
             return null
diff --git a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/APIRpnExportRepository.kt b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/APIRpnExportRepository.kt
index 9b4ea85f..394a497b 100644
--- a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/APIRpnExportRepository.kt
+++ b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/APIRpnExportRepository.kt
@@ -28,8 +28,8 @@ class APIRpnExportRepository(
         val content = ExportMissionODTInput(
             service = params.service,
             id = params.id,
-            startDateTime = params.startDateTime?.toString(),
-            endDateTime = params.endDateTime?.toString(),
+            startDateTime = params.startDateTime,
+            endDateTime = params.endDateTime,
             presenceMer = params.presenceMer,
             presenceQuai = params.presenceQuai,
             indisponibilite = params.indisponibilite,
diff --git a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/adapters/inputs/ExportMissionODTInput.kt b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/adapters/inputs/ExportMissionODTInput.kt
index 5d8d3b46..d9b40551 100644
--- a/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/adapters/inputs/ExportMissionODTInput.kt
+++ b/backend/src/main/kotlin/fr/gouv/dgampa/rapportnav/infrastructure/rapportnav1/adapters/inputs/ExportMissionODTInput.kt
@@ -1,9 +1,8 @@
 package fr.gouv.dgampa.rapportnav.infrastructure.rapportnav1.adapters.inputs
 
 import fr.gouv.dgampa.rapportnav.domain.entities.mission.nav.crew.MissionCrewEntity
-import java.time.LocalDate
 
-class ExportMissionODTInput (
+class ExportMissionODTInput(
     val service: String?,
     val id: String?,
     val startDateTime: String?,
@@ -19,5 +18,5 @@ class ExportMissionODTInput (
     val goMarine: Float?,
     val essence: Float?,
     val crew: List<MissionCrewEntity>,
-    val timeline: Map<LocalDate, List<String>>?
+    val timeline: Map<String, List<String>>?
 )