feat: add comprehensive GitHub workflow and development tools

app/.venv/Lib/site-packages/rest_framework/utils/timezone.py

@@ -0,0 +1,25 @@
+from datetime import datetime, timezone, tzinfo
+
+
+def datetime_exists(dt):
+    """Check if a datetime exists. Taken from: https://pytz-deprecation-shim.readthedocs.io/en/latest/migration.html"""
+    # There are no non-existent times in UTC, and comparisons between
+    # aware time zones always compare absolute times; if a datetime is
+    # not equal to the same datetime represented in UTC, it is imaginary.
+    return dt.astimezone(timezone.utc) == dt
+
+
+def datetime_ambiguous(dt: datetime):
+    """Check whether a datetime is ambiguous. Taken from: https://pytz-deprecation-shim.readthedocs.io/en/latest/migration.html"""
+    # If a datetime exists and its UTC offset changes in response to
+    # changing `fold`, it is ambiguous in the zone specified.
+    return datetime_exists(dt) and (
+        dt.replace(fold=not dt.fold).utcoffset() != dt.utcoffset()
+    )
+
+
+def valid_datetime(dt):
+    """Returns True if the datetime is not ambiguous or imaginary, False otherwise."""
+    if isinstance(dt.tzinfo, tzinfo) and not datetime_ambiguous(dt):
+        return True
+    return False