diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index a8e54d91..f01fad2b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,6 +1,9 @@
 default_language_version:
   python: python3.9
 
+ci:
+  skip: [pydocstyle, flake8]
+
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v3.4.0
diff --git a/tests/data/gsp/test.zarr/.zattrs b/tests/data/gsp/test.zarr/.zattrs
index 9e26dfee..0967ef42 100644
--- a/tests/data/gsp/test.zarr/.zattrs
+++ b/tests/data/gsp/test.zarr/.zattrs
@@ -1 +1 @@
-{}
\ No newline at end of file
+{}
diff --git a/tests/data/gsp/test.zarr/.zgroup b/tests/data/gsp/test.zarr/.zgroup
index 3b7daf22..3f3fad2d 100644
--- a/tests/data/gsp/test.zarr/.zgroup
+++ b/tests/data/gsp/test.zarr/.zgroup
@@ -1,3 +1,3 @@
 {
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/.zattrs b/tests/data/nwp_data/test.zarr/.zattrs
index 9e26dfee..0967ef42 100644
--- a/tests/data/nwp_data/test.zarr/.zattrs
+++ b/tests/data/nwp_data/test.zarr/.zattrs
@@ -1 +1 @@
-{}
\ No newline at end of file
+{}
diff --git a/tests/data/nwp_data/test.zarr/.zgroup b/tests/data/nwp_data/test.zarr/.zgroup
index 3b7daf22..3f3fad2d 100644
--- a/tests/data/nwp_data/test.zarr/.zgroup
+++ b/tests/data/nwp_data/test.zarr/.zgroup
@@ -1,3 +1,3 @@
 {
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/UKV/.zattrs b/tests/data/nwp_data/test.zarr/UKV/.zattrs
index 8288e411..1809cee2 100644
--- a/tests/data/nwp_data/test.zarr/UKV/.zattrs
+++ b/tests/data/nwp_data/test.zarr/UKV/.zattrs
@@ -6,4 +6,4 @@
         "y",
         "x"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/init_time/.zarray b/tests/data/nwp_data/test.zarr/init_time/.zarray
index 5a32dfb2..17010b82 100644
--- a/tests/data/nwp_data/test.zarr/init_time/.zarray
+++ b/tests/data/nwp_data/test.zarr/init_time/.zarray
@@ -17,4 +17,4 @@
         9
     ],
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/init_time/.zattrs b/tests/data/nwp_data/test.zarr/init_time/.zattrs
index 5933f893..66e1ad79 100644
--- a/tests/data/nwp_data/test.zarr/init_time/.zattrs
+++ b/tests/data/nwp_data/test.zarr/init_time/.zattrs
@@ -6,4 +6,4 @@
     "long_name": "initial time of forecast",
     "standard_name": "forecast_reference_time",
     "units": "hours since 2018-01-01"
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/step/.zattrs b/tests/data/nwp_data/test.zarr/step/.zattrs
index c3543a66..e24d4a1a 100644
--- a/tests/data/nwp_data/test.zarr/step/.zattrs
+++ b/tests/data/nwp_data/test.zarr/step/.zattrs
@@ -5,4 +5,4 @@
     "long_name": "time since forecast_reference_time",
     "standard_name": "forecast_period",
     "units": "hours"
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/variable/.zattrs b/tests/data/nwp_data/test.zarr/variable/.zattrs
index c006e0ba..7b27a29d 100644
--- a/tests/data/nwp_data/test.zarr/variable/.zattrs
+++ b/tests/data/nwp_data/test.zarr/variable/.zattrs
@@ -2,4 +2,4 @@
     "_ARRAY_DIMENSIONS": [
         "variable"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/x/.zattrs b/tests/data/nwp_data/test.zarr/x/.zattrs
index 4b15671e..1727aa4a 100644
--- a/tests/data/nwp_data/test.zarr/x/.zattrs
+++ b/tests/data/nwp_data/test.zarr/x/.zattrs
@@ -2,4 +2,4 @@
     "_ARRAY_DIMENSIONS": [
         "x"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/nwp_data/test.zarr/y/.zattrs b/tests/data/nwp_data/test.zarr/y/.zattrs
index 64ccf306..c08a98ca 100644
--- a/tests/data/nwp_data/test.zarr/y/.zattrs
+++ b/tests/data/nwp_data/test.zarr/y/.zattrs
@@ -2,4 +2,4 @@
     "_ARRAY_DIMENSIONS": [
         "y"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/.zattrs b/tests/data/sat_data.zarr/.zattrs
index 9e26dfee..0967ef42 100644
--- a/tests/data/sat_data.zarr/.zattrs
+++ b/tests/data/sat_data.zarr/.zattrs
@@ -1 +1 @@
-{}
\ No newline at end of file
+{}
diff --git a/tests/data/sat_data.zarr/.zgroup b/tests/data/sat_data.zarr/.zgroup
index 3b7daf22..3f3fad2d 100644
--- a/tests/data/sat_data.zarr/.zgroup
+++ b/tests/data/sat_data.zarr/.zgroup
@@ -1,3 +1,3 @@
 {
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/.zmetadata b/tests/data/sat_data.zarr/.zmetadata
index c785eaaa..82e63773 100644
--- a/tests/data/sat_data.zarr/.zmetadata
+++ b/tests/data/sat_data.zarr/.zmetadata
@@ -154,4 +154,4 @@
         }
     },
     "zarr_consolidated_format": 1
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/stacked_eumetsat_data/.zarray b/tests/data/sat_data.zarr/stacked_eumetsat_data/.zarray
index 71f8b301..869d5506 100644
--- a/tests/data/sat_data.zarr/stacked_eumetsat_data/.zarray
+++ b/tests/data/sat_data.zarr/stacked_eumetsat_data/.zarray
@@ -23,4 +23,4 @@
         1
     ],
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/stacked_eumetsat_data/.zattrs b/tests/data/sat_data.zarr/stacked_eumetsat_data/.zattrs
index 53bc11fd..d1e6397f 100644
--- a/tests/data/sat_data.zarr/stacked_eumetsat_data/.zattrs
+++ b/tests/data/sat_data.zarr/stacked_eumetsat_data/.zattrs
@@ -5,4 +5,4 @@
         "x",
         "variable"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/time/.zarray b/tests/data/sat_data.zarr/time/.zarray
index da1fec09..6790794f 100644
--- a/tests/data/sat_data.zarr/time/.zarray
+++ b/tests/data/sat_data.zarr/time/.zarray
@@ -23,4 +23,4 @@
         72
     ],
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/time/.zattrs b/tests/data/sat_data.zarr/time/.zattrs
index d8725dac..f0272439 100644
--- a/tests/data/sat_data.zarr/time/.zattrs
+++ b/tests/data/sat_data.zarr/time/.zattrs
@@ -4,4 +4,4 @@
     ],
     "calendar": "proleptic_gregorian",
     "units": "minutes since 2018-05-31T00:04:00"
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/variable/.zarray b/tests/data/sat_data.zarr/variable/.zarray
index 7d4ed29f..79dad97f 100644
--- a/tests/data/sat_data.zarr/variable/.zarray
+++ b/tests/data/sat_data.zarr/variable/.zarray
@@ -23,4 +23,4 @@
         1
     ],
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/variable/.zattrs b/tests/data/sat_data.zarr/variable/.zattrs
index c006e0ba..7b27a29d 100644
--- a/tests/data/sat_data.zarr/variable/.zattrs
+++ b/tests/data/sat_data.zarr/variable/.zattrs
@@ -2,4 +2,4 @@
     "_ARRAY_DIMENSIONS": [
         "variable"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/x/.zarray b/tests/data/sat_data.zarr/x/.zarray
index 48a158c2..cc88bbd1 100644
--- a/tests/data/sat_data.zarr/x/.zarray
+++ b/tests/data/sat_data.zarr/x/.zarray
@@ -17,4 +17,4 @@
         548
     ],
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/x/.zattrs b/tests/data/sat_data.zarr/x/.zattrs
index 4b15671e..1727aa4a 100644
--- a/tests/data/sat_data.zarr/x/.zattrs
+++ b/tests/data/sat_data.zarr/x/.zattrs
@@ -2,4 +2,4 @@
     "_ARRAY_DIMENSIONS": [
         "x"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/y/.zarray b/tests/data/sat_data.zarr/y/.zarray
index 790599d3..1255fc19 100644
--- a/tests/data/sat_data.zarr/y/.zarray
+++ b/tests/data/sat_data.zarr/y/.zarray
@@ -17,4 +17,4 @@
         704
     ],
     "zarr_format": 2
-}
\ No newline at end of file
+}
diff --git a/tests/data/sat_data.zarr/y/.zattrs b/tests/data/sat_data.zarr/y/.zattrs
index 64ccf306..c08a98ca 100644
--- a/tests/data/sat_data.zarr/y/.zattrs
+++ b/tests/data/sat_data.zarr/y/.zattrs
@@ -2,4 +2,4 @@
     "_ARRAY_DIMENSIONS": [
         "y"
     ]
-}
\ No newline at end of file
+}
diff --git a/tests/test_manager.py b/tests/test_manager.py
index 751bbeb0..255afeb8 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -2,8 +2,12 @@
 from datetime import datetime
 from pathlib import Path
 
+import numpy as np
+import pandas as pd
+
 import nowcasting_dataset
 from nowcasting_dataset.data_sources.gsp.gsp_data_source import GSPDataSource
+from nowcasting_dataset.data_sources.satellite.satellite_data_source import SatelliteDataSource
 from nowcasting_dataset.manager import Manager
 
 
@@ -44,4 +48,32 @@ def test_load_yaml_configuration():  # noqa: D103
     assert isinstance(manager.data_source_which_defines_geospatial_locations, GSPDataSource)
 
 
+def test_get_daylight_datetime_index():
+    """ Check that 'manager' gets the correct t0 datetime over nighttime"""
+    filename = Path(nowcasting_dataset.__file__).parent.parent / "tests" / "data" / "sat_data.zarr"
+
+    sat = SatelliteDataSource(
+        zarr_path=filename,
+        history_minutes=30,
+        forecast_minutes=60,
+        image_size_pixels=64,
+        meters_per_pixel=2000,
+    )
+
+    manager = Manager()
+    manager.data_sources = {"sat": sat}
+    manager.data_source_which_defines_geospatial_locations = sat
+    t0_datetimes = manager.get_t0_datetimes_across_all_data_sources(freq="5T")
+
+    # The testing sat_data.zarr has contiguous data from 12:05 to 18:00.
+    # nowcasting_datamodule.history_minutes = 30
+    # nowcasting_datamodule.forecast_minutes = 60
+    # Daylight ends at 16:20.
+    # So the expected t0_datetimes start at 12:35 (12:05 + 30 minutes)
+    # and end at 15:20 (16:20 - 60 minutes)
+
+    correct_t0_datetimes = pd.date_range("2019-01-01 12:35", "2019-01-01 15:20", freq="5 min")
+    np.testing.assert_array_equal(t0_datetimes, correct_t0_datetimes)
+
+
 # TODO: Issue #322: Test the other Manager methods!