pygit2: convert libgit2/pygit2 timezone offsets to standard git offsets

src/scmrepo/git/backend/pygit2/__init__.py

@@ -401,15 +401,15 @@ def resolve_commit(self, rev: str) -> "GitCommit":
         return GitCommit(
             str(commit.id),
             commit.commit_time,
-            commit.commit_time_offset,
+            commit.commit_time_offset * 60,
             commit.message,
             [str(parent) for parent in commit.parent_ids],
             commit.committer.name,
             commit.committer.email,
             commit.author.name,
             commit.author.email,
             commit.author.time,
-            commit.author.offset,
+            commit.author.offset * 60,
         )
 
     def _get_stash(self, ref: str):
@@ -962,7 +962,7 @@ def get_tag(self, name: str) -> Optional[Union[str, "GitTag"]]:
                     tag.tagger.name,
                     tag.tagger.email,
                     tag.tagger.time,
-                    tag.tagger.offset,
+                    tag.tagger.offset * 60,
                     tag.message,
                 )
         except KeyError:

src/scmrepo/git/objects.py

@@ -1,3 +1,4 @@
+import datetime
 import stat
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
@@ -12,6 +13,11 @@ def S_ISGITLINK(m: int) -> bool:
     return stat.S_IFMT(m) == S_IFGITLINK
 
 
+def _to_datetime(time: int, offset: int) -> datetime.datetime:
+    tz = datetime.timezone(datetime.timedelta(seconds=offset))
+    return datetime.datetime.fromtimestamp(time, tz=tz)
+
+
 class GitObject(ABC):
     @abstractmethod
     def open(self, mode: str = "r", encoding: str = None):
@@ -169,6 +175,14 @@ class GitCommit:
     author_time: int
     author_time_offset: int
 
+    @property
+    def commit_datetime(self) -> datetime.datetime:
+        return _to_datetime(self.commit_time, self.commit_time_offset)
+
+    @property
+    def author_datetime(self) -> datetime.datetime:
+        return _to_datetime(self.author_time, self.author_time_offset)
+
 
 @dataclass
 class GitTag:
@@ -180,3 +194,7 @@ class GitTag:
     tag_time: int
     tag_time_offset: int
     message: str
+
+    @property
+    def tag_datetime(self) -> datetime.datetime:
+        return _to_datetime(self.tag_time, self.tag_time_offset)