add optional 'utcoffset' argument to 'parse_datetime()'

gallery_dl/text.py

@@ -233,7 +233,7 @@ def parse_timestamp(ts, default=None):
         return default
 
 
-def parse_datetime(date_string, format="%Y-%m-%dT%H:%M:%S%z"):
+def parse_datetime(date_string, format="%Y-%m-%dT%H:%M:%S%z", utcoffset=0):
     """Create a datetime object by parsing 'date_string'"""
     try:
         if format.endswith("%z") and date_string[-3] == ":":
@@ -244,7 +244,11 @@ def parse_datetime(date_string, format="%Y-%m-%dT%H:%M:%S%z"):
         d = datetime.datetime.strptime(ds, format)
         o = d.utcoffset()
         if o is not None:
-            d = d.replace(tzinfo=None) - o  # convert to naive UTC
+            # convert to naive UTC
+            d = d.replace(tzinfo=None) - o
+        elif utcoffset:
+            # apply manual UTC offset
+            d += datetime.timedelta(0, utcoffset * -3600)
         return d
     except (TypeError, IndexError, KeyError):
         return None

test/test_text.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-# Copyright 2015-2018 Mike Fährmann
+# Copyright 2015-2020 Mike Fährmann
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 as
@@ -375,6 +375,10 @@ class TestText(unittest.TestCase):
             f("2019-05-07T21:25:02+0900"),
             datetime.datetime(2019, 5, 7, 12, 25, 2),
         )
+        self.assertEqual(
+            f("2019-05-07T21:25:02", "%Y-%m-%dT%H:%M:%S", utcoffset=9),
+            datetime.datetime(2019, 5, 7, 12, 25, 2),
+        )
         self.assertEqual(
             f("2019-05-07 21:25:02"),
             "2019-05-07 21:25:02",