diff --git a/src/dolphin/interferogram.py b/src/dolphin/interferogram.py
index c8dece3e..d27101af 100644
--- a/src/dolphin/interferogram.py
+++ b/src/dolphin/interferogram.py
@@ -774,6 +774,7 @@ def convert_pl_to_ifg(
     reference_date: DateOrDatetime,
     output_dir: Filename,
     dry_run: bool = False,
+    date_format: str = io.DEFAULT_DATETIME_FORMAT,
 ) -> Path:
     """Convert a phase-linked SLC to an interferogram by conjugating the phase.
 
@@ -793,6 +794,11 @@ def convert_pl_to_ifg(
         Default = False (the ifgs will be created/written to disk.)
         `dry_run=True` is used to plan out which ifgs will be formed
         before actually running the workflow.
+    date_format : str, optional
+        ``strptime``-compatible format used both to parse the date from
+        ``phase_linked_slc`` and to format the output filename. Must match
+        the format of the input filename so the time-of-day component is
+        preserved when callers use formats like ``"%Y%m%d%H%M%S"``.
 
     Returns
     -------
@@ -802,8 +808,8 @@ def convert_pl_to_ifg(
     """
     # The phase_linked_slc will be named with the secondary date.
     # Make the output from that, plus the given reference date
-    secondary_date = get_dates(phase_linked_slc)[-1]
-    date_str = utils.format_date_pair(reference_date, secondary_date)
+    secondary_date = get_dates(phase_linked_slc, fmt=date_format)[-1]
+    date_str = utils.format_date_pair(reference_date, secondary_date, fmt=date_format)
     out_name = Path(output_dir) / f"{date_str}.int.vrt"
     if dry_run:
         return out_name
diff --git a/src/dolphin/stack.py b/src/dolphin/stack.py
index 945f0592..6788c368 100755
--- a/src/dolphin/stack.py
+++ b/src/dolphin/stack.py
@@ -547,6 +547,7 @@ def plan(
                 output_reference_idx=output_reference_idx,
                 compressed_reference_idx=compressed_reference_idx,
                 output_folder=cur_output_folder,
+                file_date_fmt=self.file_date_fmt,
             )
 
             output_ministacks.append(cur_ministack)
diff --git a/src/dolphin/stitching.py b/src/dolphin/stitching.py
index 4bb823cb..f15d82d8 100644
--- a/src/dolphin/stitching.py
+++ b/src/dolphin/stitching.py
@@ -110,7 +110,7 @@ def merge_by_date(
 
     for dates, cur_images in grouped_images.items():
         logger.info(f"{dates}: Stitching {len(cur_images)} images.")
-        date_str = utils.format_dates(*dates)
+        date_str = utils.format_dates(*dates, fmt=file_date_fmt)
         # If we passed files where different dates have different prefixes,
         # we need to use the common prefix before the first date token
         # e.g. if we have "temporal_coherence_<dates>,...
diff --git a/src/dolphin/timeseries.py b/src/dolphin/timeseries.py
index 6efa0fb0..ebf2e3a4 100644
--- a/src/dolphin/timeseries.py
+++ b/src/dolphin/timeseries.py
@@ -215,6 +215,7 @@ def run(
             wavelength=wavelength,
             method=method,
             bad_pixel_mask=bad_pixel_mask,
+            file_date_fmt=file_date_fmt,
         )
         if extra_reference_date is None:
             final_ts_paths = inverted_phase_paths
@@ -309,7 +310,7 @@ def _redo_reference(
         # To create the interferogram (r, r+1), we subtract
         # (1, r) from (1, r+1)
         cur_img = inverted_phase_paths[idx]
-        new_stem = format_dates(ref_date, secondary_dates[idx])
+        new_stem = format_dates(ref_date, secondary_dates[idx], fmt=file_date_fmt)
         cur_output_name = extra_out_dir / f"{new_stem}.tif"
         cur = io.load_gdal(cur_img, masked=True)
         new_out = cur - ref
@@ -1046,10 +1047,12 @@ def invert_unw_network(
     suffix = ".tif"
     # Create the `n_sar_dates - 1` output files (skipping the 0 reference raster)
     out_paths = [
-        Path(output_dir) / f"{format_dates(ref_date, d)}{suffix}" for d in sar_dates[1:]
+        Path(output_dir) / f"{format_dates(ref_date, d, fmt=file_date_fmt)}{suffix}"
+        for d in sar_dates[1:]
     ]
     out_residuals_paths = [
-        Path(output_dir) / f"residuals_{format_dates(ref_date, d)}{suffix}"
+        Path(output_dir)
+        / f"residuals_{format_dates(ref_date, d, fmt=file_date_fmt)}{suffix}"
         for d in sar_dates[1:]
     ]
     if all(p.exists() for p in out_paths):
@@ -1585,7 +1588,7 @@ def create_nonzero_conncomp_counts(
 
     # Create output paths for each date
     suffix = "_valid_count.tif"
-    out_paths = [output_dir / f"{d.strftime('%Y%m%d')}{suffix}" for d in sar_dates]
+    out_paths = [output_dir / f"{d.strftime(file_date_fmt)}{suffix}" for d in sar_dates]
 
     if all(p.exists() for p in out_paths):
         logger.info("All output files exist, skipping counting")
diff --git a/src/dolphin/unwrap/_unwrap.py b/src/dolphin/unwrap/_unwrap.py
index 6e1c5fa6..c2e9ae76 100644
--- a/src/dolphin/unwrap/_unwrap.py
+++ b/src/dolphin/unwrap/_unwrap.py
@@ -55,6 +55,7 @@ def run(
     scratchdir: PathOrStr | None = None,
     delete_intermediate: bool = True,
     overwrite: bool = False,
+    file_date_fmt: str = "%Y%m%d",
 ) -> tuple[list[Path], list[Path]]:
     """Run snaphu on all interferograms in a directory.
 
@@ -94,6 +95,10 @@ def run(
         Must specify `scratchdir` for this option to be used.
     overwrite : bool, optional, default = False
         Overwrite existing unwrapped files.
+    file_date_fmt : str, optional
+        The strftime format used to parse acquisition dates from input
+        filenames and to write the date portion of output filenames.
+        Default is "%Y%m%d".
 
     Returns
     -------
@@ -129,6 +134,7 @@ def run(
             mask_filename=mask_filename,
             options=unwrap_options.spurt_options,
             scratchdir=scratchdir,
+            file_date_fmt=file_date_fmt,
         )
         for f in unw_paths:
             io.set_raster_units(f, "radians")
diff --git a/src/dolphin/unwrap/_unwrap_3d.py b/src/dolphin/unwrap/_unwrap_3d.py
index c813fda6..5b13bbb9 100644
--- a/src/dolphin/unwrap/_unwrap_3d.py
+++ b/src/dolphin/unwrap/_unwrap_3d.py
@@ -36,6 +36,7 @@ def unwrap_spurt(
     options: SpurtOptions = DEFAULT_OPTIONS,
     scratchdir: PathOrStr | None = None,
     num_retries: int = 3,
+    file_date_fmt: str = "%Y%m%d",
 ) -> tuple[list[Path], list[Path]]:
     """Perform 3D unwrapping using `spurt` via subprocess call."""
     # NOTE: we are working around spurt currently wanting "temporal_coherence.tif",
@@ -86,6 +87,8 @@ def unwrap_spurt(
         str(scratch_path / "emcf_tmp"),
         "-c",
         str(0.5),  # arbitrary, since we are passing a 0/1 file anyway
+        "--date-fmt",
+        file_date_fmt,
     ]
     if not options.general_settings.use_tiles:
         cmd.append("--singletile")
@@ -157,7 +160,9 @@ def run_with_retry(cmd: list[str], num_retries: int = 3) -> int:
     )
 
     if options.run_ambiguity_interpolation:
-        filled_masked_unw_regions(unw_filenames, ifg_filenames)
+        filled_masked_unw_regions(
+            unw_filenames, ifg_filenames, file_date_fmt=file_date_fmt
+        )
     return unw_filenames, conncomp_filenames
 
 
diff --git a/src/dolphin/workflows/displacement.py b/src/dolphin/workflows/displacement.py
index 0c4e18ed..c4dc900f 100755
--- a/src/dolphin/workflows/displacement.py
+++ b/src/dolphin/workflows/displacement.py
@@ -262,6 +262,7 @@ def run(
         nlooks=nlooks,
         unwrap_options=cfg.unwrap_options,
         mask_file=cfg.mask_file,
+        file_date_fmt=cfg.input_options.cslc_date_fmt,
     )
 
     # ##############################################
@@ -294,6 +295,7 @@ def run(
             wavelength=cfg.input_options.wavelength,
             add_overviews=cfg.output_options.add_overviews,
             extra_reference_date=cfg.output_options.extra_reference_date,
+            file_date_fmt=cfg.input_options.cslc_date_fmt,
         )
 
     else:
diff --git a/src/dolphin/workflows/sequential.py b/src/dolphin/workflows/sequential.py
index 54217e20..a0fa1ed3 100644
--- a/src/dolphin/workflows/sequential.py
+++ b/src/dolphin/workflows/sequential.py
@@ -77,6 +77,12 @@ def run_wrapped_phase_sequential(
         max_num_compressed=max_num_compressed,
         output_reference_idx=output_reference_idx,
         compressed_slc_plan=compressed_slc_plan,
+        # Propagate the caller's date format so phase-linked SLC and CRLB
+        # filenames preserve any time-of-day component. Without this, output
+        # filenames are written with the default ``%Y%m%d`` and ``create_ifgs``
+        # later fails to extract dates when ``cslc_date_fmt`` includes hours
+        # (e.g. ``%Y%m%d%H%M%S`` for non-SSO cadences with same-day repeats).
+        file_date_fmt=cslc_date_fmt,
     )
     ministacks = ministack_planner.plan(
         ministack_size, compressed_idx=new_compressed_reference_idx
diff --git a/src/dolphin/workflows/unwrapping.py b/src/dolphin/workflows/unwrapping.py
index 9384d818..38cc8f3d 100644
--- a/src/dolphin/workflows/unwrapping.py
+++ b/src/dolphin/workflows/unwrapping.py
@@ -27,6 +27,7 @@ def run(
     similarity_filename: Path | str | None = None,
     mask_file: Path | str | None = None,
     add_overviews: bool = True,
+    file_date_fmt: str = "%Y%m%d",
 ) -> tuple[list[Path], list[Path]]:
     """Run the displacement workflow on a stack of SLCs.
 
@@ -51,6 +52,10 @@ def run(
     add_overviews : bool, default = True
         If True, creates overviews of the unwrapped phase and connected component
         labels.
+    file_date_fmt : str, optional
+        The strftime format used to parse acquisition dates from input
+        filenames and to write the date portion of output filenames.
+        Default is "%Y%m%d".
 
     Returns
     -------
@@ -92,6 +97,7 @@ def run(
         similarity_filename=similarity_filename,
         mask_filename=output_mask,
         scratchdir=unwrap_scratchdir,
+        file_date_fmt=file_date_fmt,
     )
 
     if add_overviews:
diff --git a/src/dolphin/workflows/wrapped_phase.py b/src/dolphin/workflows/wrapped_phase.py
index df54025b..a17fd713 100644
--- a/src/dolphin/workflows/wrapped_phase.py
+++ b/src/dolphin/workflows/wrapped_phase.py
@@ -400,6 +400,7 @@ def create_ifgs(
             outdir=ifg_dir,
             write=not dry_run,
             verify_slcs=not dry_run,
+            date_format=file_date_fmt,
         )
         if len(network.ifg_list) == 0:
             msg = "No interferograms were created"
@@ -419,7 +420,11 @@ def create_ifgs(
         # a `.conj()` on the phase-linked SLCs (currently `day1.conj() * day2`)
         single_ref_ifgs = [
             interferogram.convert_pl_to_ifg(
-                f, reference_date=reference_date, output_dir=ifg_dir, dry_run=dry_run
+                f,
+                reference_date=reference_date,
+                output_dir=ifg_dir,
+                dry_run=dry_run,
+                date_format=file_date_fmt,
             )
             for f in phase_linked_slcs
         ]
@@ -434,6 +439,7 @@ def create_ifgs(
                 reference_date=reference_date,  # this is the `phase_linking.output_idx`
                 output_dir=ifg_dir,
                 dry_run=dry_run,
+                date_format=file_date_fmt,
             )
             for f in phase_linked_slcs[: manual_reference_idx + 1]
         ]
@@ -446,6 +452,7 @@ def create_ifgs(
                 outdir=ifg_dir,
                 write=not dry_run,
                 verify_slcs=not dry_run,
+                date_format=file_date_fmt,
             )
             single_ref_ifgs.append(v.path)  # type: ignore[arg-type]
 
@@ -472,6 +479,7 @@ def create_ifgs(
             dates=secondary_dates,
             write=not dry_run,
             verify_slcs=not dry_run,
+            date_format=file_date_fmt,
         )
         # Using `cast` to assert that the paths are not None
         if len(network.ifg_list) == 0:
@@ -495,6 +503,7 @@ def create_ifgs(
             dates=secondary_dates,
             write=not dry_run,
             verify_slcs=not dry_run,
+            date_format=file_date_fmt,
         )
         # Using `cast` to assert that the paths are not None
         ifgs_others = cast(list[Path], [ifg.path for ifg in network_rest.ifg_list])
diff --git a/tests/test_workflows_displacement.py b/tests/test_workflows_displacement.py
index 151d4b76..d9b88206 100644
--- a/tests/test_workflows_displacement.py
+++ b/tests/test_workflows_displacement.py
@@ -285,6 +285,65 @@ def test_displacement_run_extra_reference_date(
         log_file.unlink()
 
 
+def test_displacement_run_preserves_time_of_day_in_filenames(
+    opera_slc_files_official: list[Path], tmpdir
+):
+    """Datetime ``cslc_date_fmt`` must propagate to all output filenames.
+
+    Regression test covering three independent propagation points:
+    - ``MiniStackPlanner`` -> ``MiniStackInfo.file_date_fmt`` (PL SLC names),
+    - ``create_ifgs`` -> ``convert_pl_to_ifg(..., date_format=...)``
+      (per-burst ifg VRT names),
+    - ``stitching.merge_by_date`` formatting the grouped dates with
+      ``file_date_fmt`` (stitched ifg names).
+
+    Without all three, a caller using ``cslc_date_fmt="%Y%m%dT%H%M%S"`` ends up
+    with output filenames stripped to ``%Y%m%d``, which then breaks downstream
+    date extraction (e.g. same-day repeats collide).
+    """
+    # ``opera_slc_files_official`` fixture uses ``datetime(2022, 1, 1, 1, 2, 3)``
+    # as the base, incremented by one day per acquisition. So every real-SLC
+    # filename should embed ``T010203`` once propagation works end-to-end.
+    time_token = "T010203"
+    with tmpdir.as_cwd():
+        cfg = config.DisplacementWorkflow(
+            cslc_file_list=opera_slc_files_official,
+            input_options={
+                "subdataset": "/data/VV",
+                "cslc_date_fmt": "%Y%m%dT%H%M%S",
+            },
+            interferogram_network={"reference_idx": 0},
+            phase_linking={"ministack_size": 500},
+            unwrap_options={"run_unwrap": False},
+        )
+        paths = displacement.run(cfg)
+
+        # Per-burst phase-linked SLCs (named by ``MiniStackInfo.get_date_str_list``)
+        # and per-burst ifgs (named by ``convert_pl_to_ifg``) must keep the
+        # time-of-day component end-to-end through ``create_ifgs``.
+        burst_dir = next(iter(paths.comp_slc_dict.values()))[0].parent.parent
+        pl_slcs = list((burst_dir / "linked_phase").glob("*.slc.tif"))
+        assert len(pl_slcs) > 0
+        for p in pl_slcs:
+            assert time_token in p.stem, f"Missing datetime in PL SLC {p.name}"
+
+        burst_ifgs = list((burst_dir / "interferograms").glob("*.int.*"))
+        assert len(burst_ifgs) > 0
+        for p in burst_ifgs:
+            assert (
+                p.stem.count(time_token) == 2
+            ), f"Expected datetime preserved in both dates of {p.name}"
+
+        # Stitched (cross-burst) ifgs must also keep the time-of-day in both
+        # the reference and secondary date tokens.
+        assert len(paths.stitched_ifg_paths) > 0
+        for p in paths.stitched_ifg_paths:
+            assert p.exists()
+            assert (
+                p.stem.count(time_token) == 2
+            ), f"Expected datetime preserved in both dates of {p.name}"
+
+
 def test_displacement_run_different_epsg(opera_slc_files: list[Path], tmpdir):
     with tmpdir.as_cwd():
         cfg = config.DisplacementWorkflow(