diff --git a/pms_api_rest/datamodels/__init__.py b/pms_api_rest/datamodels/__init__.py
index fd0bf8e53d..155aaec3e2 100644
--- a/pms_api_rest/datamodels/__init__.py
+++ b/pms_api_rest/datamodels/__init__.py
@@ -12,3 +12,5 @@
 
 from . import pms_checkin_partner_info
 from . import pms_partner_info
+
+from . import pms_calendar_swap_info
diff --git a/pms_api_rest/datamodels/pms_calendar_swap_info.py b/pms_api_rest/datamodels/pms_calendar_swap_info.py
new file mode 100644
index 0000000000..ee9f2a0bb0
--- /dev/null
+++ b/pms_api_rest/datamodels/pms_calendar_swap_info.py
@@ -0,0 +1,11 @@
+from marshmallow import fields
+
+from odoo.addons.datamodel.core import Datamodel
+
+
+class PmsCalendarSwapInfo(Datamodel):
+    _name = "pms.calendar.swap.info"
+    swapFrom = fields.String(required=True, allow_none=False)
+    swapTo = fields.String(required=True, allow_none=False)
+    roomIdA = fields.Integer(required=True, allow_none=False)
+    roomIdB = fields.Integer(required=True, allow_none=False)
diff --git a/pms_api_rest/services/calendar_service.py b/pms_api_rest/services/calendar_service.py
index 7a0d36e147..b33660dbf5 100644
--- a/pms_api_rest/services/calendar_service.py
+++ b/pms_api_rest/services/calendar_service.py
@@ -26,12 +26,8 @@ class PmsCalendarService(Component):
     )
     def get_calendar(self, calendar_search_param):
         domain = list()
-        domain.append(
-            ("date", ">", datetime.fromisoformat(calendar_search_param.date_from))
-        )
-        domain.append(
-            ("date", "<=", datetime.fromisoformat(calendar_search_param.date_to))
-        )
+        domain.append(("date", ">=", calendar_search_param.date_from))
+        domain.append(("date", "<=", calendar_search_param.date_to))
         result_lines = []
         PmsCalendarInfo = self.env.datamodels["pms.calendar.info"]
         for line in (
@@ -51,3 +47,44 @@ def get_calendar(self, calendar_search_param):
                 )
             )
         return result_lines
+
+    @restapi.method(
+        [
+            (
+                [
+                    "/swap",
+                ],
+                "POST",
+            )
+        ],
+        input_param=Datamodel("pms.calendar.swap.info", is_list=False),
+        auth="public",
+    )
+    def swap_reservation_slices(self, swap_info):
+        room_id_a = swap_info.roomIdA
+        room_id_b = swap_info.roomIdB
+
+        lines_room_a = self.env["pms.reservation.line"].search(
+            [
+                ("room_id", "=", room_id_a),
+                ("date", ">=", swap_info.swapFrom),
+                ("date", "<=", swap_info.swapTo),
+            ]
+        )
+
+        lines_room_b = self.env["pms.reservation.line"].search(
+            [
+                ("room_id", "=", room_id_b),
+                ("date", ">=", swap_info.swapFrom),
+                ("date", "<=", swap_info.swapTo),
+            ]
+        )
+        lines_room_a.occupies_availability = False
+        lines_room_b.occupies_availability = False
+        lines_room_a.flush()
+        lines_room_b.flush()
+        lines_room_a.room_id = room_id_b
+        lines_room_b.room_id = room_id_a
+
+        lines_room_a._compute_occupies_availability()
+        lines_room_b._compute_occupies_availability()