diff --git a/scripts/msys2-install-deps b/scripts/msys2-install-deps
index 0cbf864242..19d940412d 100644
--- a/scripts/msys2-install-deps
+++ b/scripts/msys2-install-deps
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-pacman -S --needed --noconfirm git mingw-w64-ucrt-x86_64-{toolchain,pkgconf,lz4,openssl,rclone,python-msgpack,python-platformdirs,python,cython,python-setuptools,python-wheel,python-build,python-pkgconfig,python-packaging,python-pip,python-paramiko,rust,python-maturin}
+pacman -S --needed --noconfirm git mingw-w64-ucrt-x86_64-{toolchain,pkgconf,lz4,openssl,rclone,python-msgpack,python-platformdirs,python,cython,python-setuptools,python-setuptools-scm,python-wheel,python-build,python-pkgconfig,python-packaging,python-pip,python-paramiko,rust,python-maturin}
 
 if [ "$1" = "development" ]; then
 	pacman -S --needed --noconfirm mingw-w64-ucrt-x86_64-python-{pytest,pytest-benchmark,pytest-cov,pytest-xdist}
diff --git a/src/borg/helpers/time.py b/src/borg/helpers/time.py
index b0610213fb..ef4f23ad01 100644
--- a/src/borg/helpers/time.py
+++ b/src/borg/helpers/time.py
@@ -24,7 +24,11 @@ def parse_local_timestamp(timestamp, tzinfo=None):
     """
     dt = datetime.fromisoformat(timestamp)
     if dt.tzinfo is None:
-        dt = dt.astimezone(tz=tzinfo)
+        try:
+            dt = dt.astimezone(tz=tzinfo)
+        except OSError as e:
+            # e.g. win32 local time conversion fails for timestamps close to (or before) the epoch.
+            raise ValueError(f"cannot convert {timestamp} to local time: {e}") from None
     return dt
 
 
diff --git a/src/borg/testsuite/archiver/completion_cmd_test.py b/src/borg/testsuite/archiver/completion_cmd_test.py
index 24a501ed94..6b582947e6 100644
--- a/src/borg/testsuite/archiver/completion_cmd_test.py
+++ b/src/borg/testsuite/archiver/completion_cmd_test.py
@@ -615,12 +615,14 @@ def test_completion_repo_is_a_directory(archivers, request, shell):
 def test_bash_repo_url_no_directories(archivers, request, tmp_path):
     archiver = request.getfixturevalue(archivers)
     (tmp_path / "somerepo").mkdir()
-    for url in REPO_URLS:
-        # a local directory looking like the start of the URL, so that plain directory completion finds it
-        (tmp_path / url.split("/")[0]).mkdir(exist_ok=True)
+    # local directories looking like the start of the URLs, so that plain directory completion finds them.
+    # created by bash: on win32, MSYS2/Cygwin map the colon to a valid file name character.
+    dirs = " ".join(sorted({url.split("/")[0] for url in REPO_URLS}))
     script = cmd(archiver, "completion", "bash")
     for url in REPO_URLS:
-        result = _run_bash_completion_fn(script, f'cd "{tmp_path}"\n_borg_complete_repo_dirs "{url}"\n')
+        result = _run_bash_completion_fn(
+            script, f'cd "{tmp_path}"\nmkdir -p {dirs}\n_borg_complete_repo_dirs "{url}"\n'
+        )
         assert result.returncode == 0, f"stderr: {result.stderr}"
         assert result.stdout == "", f"directories offered for {url}: {result.stdout}"
     result = _run_bash_completion_fn(script, f'cd "{tmp_path}"\n_borg_complete_repo_dirs some\n')
diff --git a/src/borg/testsuite/archiver/recreate_cmd_test.py b/src/borg/testsuite/archiver/recreate_cmd_test.py
index af140f7691..a0a07fd58f 100644
--- a/src/borg/testsuite/archiver/recreate_cmd_test.py
+++ b/src/borg/testsuite/archiver/recreate_cmd_test.py
@@ -262,9 +262,10 @@ def test_recreate_with_given_timestamp(archivers, request):
     # this shall recreate the archive with a different nominal timestamp.
     # --timestamp is the only change requested, so this also checks that a timestamp
     # change alone is enough to make recreate do the work instead of skipping the archive.
-    cmd(archiver, "recreate", "-a", "test0", "--timestamp", "1970-01-02T00:00:00")
+    # not 1970-01-02: win32 cannot convert that to local time east of UTC.
+    cmd(archiver, "recreate", "-a", "test0", "--timestamp", "1970-01-03T00:00:00")
     info = cmd(archiver, "info", "-a", "test0").splitlines()
-    dtime = datetime(1970, 1, 2, 0, 0, 0).astimezone()  # local time in local timezone
+    dtime = datetime(1970, 1, 3, 0, 0, 0).astimezone()  # local time in local timezone
     s_time = dtime.strftime("%Y-%m-%d %H:%M:.. %z").replace("+", r"\+")
     assert any([re.search(r"Time \(nominal\).+ %s" % s_time, item) for item in info])
     # start/end time are just from the recreate operation
diff --git a/src/borg/testsuite/helpers/time_test.py b/src/borg/testsuite/helpers/time_test.py
index 8b929213d2..44ba2da92e 100644
--- a/src/borg/testsuite/helpers/time_test.py
+++ b/src/borg/testsuite/helpers/time_test.py
@@ -3,7 +3,8 @@
 
 from ...helpers.time import safe_ns, safe_s, safe_timestamp, SUPPORT_32BIT_PLATFORMS, calculate_relative_offset
 from ...helpers.time import format_time, format_time_ns, OutputTimestamp
-from ...helpers.time import ns_to_pax_time, pax_time_to_ns
+from ...helpers.time import ns_to_pax_time, pax_time_to_ns, parse_local_timestamp
+from ...helpers import time as time_module
 
 
 def utcfromtimestamp(timestamp):
@@ -107,3 +108,14 @@ def test_ns_to_pax_time(ns, expected):
 )
 def test_pax_time_to_ns(value, expected):
     assert pax_time_to_ns(value) == expected
+
+
+def test_parse_local_timestamp_oserror(monkeypatch):
+    # win32 fails to convert 1970-01-02T00:00:00 to local time east of UTC.
+    class FailingDatetime(datetime):
+        def astimezone(self, tz=None):
+            raise OSError(22, "Invalid argument")
+
+    monkeypatch.setattr(time_module, "datetime", FailingDatetime)
+    with pytest.raises(ValueError, match="cannot convert 1970-01-02T00:00:00 to local time"):
+        parse_local_timestamp("1970-01-02T00:00:00")