diff --git a/msystems/soap/datetime.py b/msystems/soap/datetime.py
new file mode 100644
index 0000000..ad8405c
--- /dev/null
+++ b/msystems/soap/datetime.py
@@ -0,0 +1,22 @@
+import re
+from datetime import datetime as py_datetime
+
+from core import datetime
+
+class SoapDatetime(datetime.datetime):
+    def isoformat(self):
+        return re.sub(r"[+-]00:?00$", "Z", self.strftime("%y-%m-%dT%H:%M:%S%z"))
+
+    @classmethod
+    def from_ad_date(cls, value):
+        if value is None:
+            return None
+        return SoapDatetime(value.year, value.month, value.day, 0, 0, 0, 0, py_datetime.now().astimezone().tzinfo)
+
+    @classmethod
+    def from_ad_datetime(cls, value):
+        if value is None:
+            return None
+        return SoapDatetime(value.year, value.month, value.day,
+                          value.hour, value.minute, value.second, value.microsecond,
+                          value.tzinfo or py_datetime.now().astimezone().tzinfo)
\ No newline at end of file
diff --git a/msystems/soap/models.py b/msystems/soap/models.py
index 3380594..b4a311d 100644
--- a/msystems/soap/models.py
+++ b/msystems/soap/models.py
@@ -1,3 +1,5 @@
+from datetime import timezone
+
 from spyne.model.primitive import Unicode, DateTime, Decimal, Boolean
 from spyne.model.complex import ComplexModel, Array
 from spyne.model.enum import Enum
@@ -69,8 +71,8 @@ class OrderDetails(ComplexModel):
     CustomerID = Unicode.customize(min_occurs=0, max_occurs=1, max_len=13, nillable=False)
     CustomerName = Unicode.customize(min_occurs=1, max_occurs=1, max_len=60, nillable=False)
     CustomerType = CustomerType.customize(min_occurs=1, max_occurs=1, nillable=False)
-    DueDate = DateTime.customize(min_occurs=0, max_occurs=1, nillable=False)
-    IssuedAt = DateTime.customize(min_occurs=0, max_occurs=1, nillable=False)
+    DueDate = DateTime.customize(min_occurs=0, max_occurs=1, nillable=False, as_timezone=timezone.utc)
+    IssuedAt = DateTime.customize(min_occurs=0, max_occurs=1, nillable=False, as_timezone=timezone.utc)
     Lines = (Array(OrderLine.customize(min_occurs=1, max_occurs="unbounded", nillable=False))
              .customize(min_occurs=1, max_occurs=1, nillable=False))
     OrderKey = Unicode.customize(min_occurs=1, max_occurs=1, max_len=36, nillable=False)
diff --git a/msystems/views/mpay.py b/msystems/views/mpay.py
index 582d81d..6244acc 100644
--- a/msystems/views/mpay.py
+++ b/msystems/views/mpay.py
@@ -1,6 +1,5 @@
 import decimal
 import logging
-from functools import reduce
 
 from lxml import etree
 from django.db import transaction
@@ -21,6 +20,7 @@
 from invoice.apps import InvoiceConfig
 from invoice.models import Bill, BillPayment
 from msystems.apps import MsystemsConfig
+from msystems.soap.datetime import SoapDatetime
 from msystems.soap.models import OrderDetailsQuery, GetOrderDetailsResult, OrderLine, OrderDetails, \
     PaymentConfirmation, PaymentAccount, OrderStatus, CustomerType
 from msystems.xml_utils import add_signature, verify_signature, verify_timestamp, add_timestamp
@@ -156,8 +156,8 @@ def GetOrderDetails(ctx, query: OrderDetailsQuery) -> GetOrderDetailsResult:
             ServiceID=query.ServiceID,
             Status=_order_status_map[bill.status],
             TotalAmountDue=str(bill.amount_total),
-            IssuedAt=bill.date_created.strftime("%Y-%m-%dT%H:%M:%SZ"),
-            DueAt=bill.date_due.strftime("%Y-%m-%dT%H:%M:%SZ"),
+            IssuedAt=SoapDatetime.from_ad_datetime(bill.date_created),
+            DueDate=SoapDatetime.from_ad_date(bill.date_due),
         )
 
         ret = GetOrderDetailsResult(OrderDetails=order_details)