fix test

src/nd2/_ome.py

@@ -56,7 +56,7 @@ def nd2_ome_metadata(
     rdr = cast("ModernReader", f._rdr)
     meta = f.metadata
     images = []
-    acquisition_date = rdr._acquisition_date()
+    acquisition_date = rdr._acquisition_datetime()
     uuid_ = f"urn:uuid:{uuid.uuid4()}"
     sizes = dict(f.sizes)
     n_positions = sizes.pop(AXIS.POSITION, 1)

src/nd2/readers/_modern/modern_reader.py

@@ -3,6 +3,7 @@
 import os
 import warnings
 import zlib
+from contextlib import suppress
 from typing import TYPE_CHECKING, Any, Iterable, Mapping, Sequence, cast
 
 import numpy as np
@@ -528,11 +529,13 @@ def _app_info(self) -> dict:
         k = b"CustomDataVar|AppInfo_V1_0!"
         return self._decode_chunk(k) if k in self.chunkmap else {}
 
-    def _acquisition_date(self) -> datetime.datetime | None:
+    def _acquisition_datetime(self) -> datetime.datetime | None:
         """Try to extract acquisition date."""
         time = self._cached_global_metadata().get("time", {})
-        jdn = time.get("absoluteJulianDayNumber")
-        return _util.jdn_to_datetime(jdn) if jdn else None
+        if jdn := time.get("absoluteJulianDayNumber"):
+            with suppress(ValueError):
+                return _util.jdn_to_datetime(jdn)
+        return None
 
     def binary_data(self) -> BinaryLayers | None:
         from nd2._binary import BinaryLayer, BinaryLayers, decode_binary_mask