From bad6d8613a05257a5171f6aa7c7e8f18226d615c Mon Sep 17 00:00:00 2001
From: Aryn <63111101+arynyklas@users.noreply.github.com>
Date: Sun, 24 Apr 2022 07:01:14 +0600
Subject: [PATCH] Fix datetime serialization error on Windows (#880)

* fix #349

* fix #349 (2)
---
 aiogram/types/fields.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/aiogram/types/fields.py b/aiogram/types/fields.py
index d7a1d8ca..a0adea65 100644
--- a/aiogram/types/fields.py
+++ b/aiogram/types/fields.py
@@ -1,6 +1,7 @@
 import abc
 import datetime
 import weakref
+import sys
 
 __all__ = ('BaseField', 'Field', 'ListField', 'DateTimeField', 'TextField', 'ListOfLists', 'ConstField')
 
@@ -168,8 +169,13 @@ class DateTimeField(Field):
     out: datetime
     """
 
-    def serialize(self, value: datetime.datetime):
-        return round(value.timestamp())
+    if sys.platform == "win32":
+        def serialize(self, value: datetime.datetime):
+            return round((value - datetime.datetime(1970, 1, 1)).total_seconds())
+
+    else:
+        def serialize(self, value: datetime.datetime):
+            return round(value.timestamp())
 
     def deserialize(self, value, parent=None):
         return datetime.datetime.fromtimestamp(value)