diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1592b8d0db844f11736ba2ccedc7e8d4ccd70f6c..3683b4d037abe18c16383245252cd3b3d00e24e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## v0.6.8 - 2025-03-07 - bugfix in time harmonizing
+
 ## v0.6.7 - 2025-02-21 - fixed output format
 
 ### general:
diff --git a/dist/toarstats-0.6.8-py3-none-any.whl b/dist/toarstats-0.6.8-py3-none-any.whl
new file mode 100644
index 0000000000000000000000000000000000000000..1564e5d2908e466cfeba98841c55dba6c1413182
Binary files /dev/null and b/dist/toarstats-0.6.8-py3-none-any.whl differ
diff --git a/setup.cfg b/setup.cfg
index 256d56f3d0d17f498ee8f1b5788e57201c5a8322..bdd4fbc3f9ff610553a4f00e5dd10c8bf8f0966b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = toarstats
-version = 0.6.7
+version = 0.6.8
 author = Niklas Selke, Martin Schultz, Max Lensing
 author_email = n.selke@fz-juelich.de, m.schultz@fz-juelich.de, m.lensing@fz-juelich.de
 description = Collection of statistics for the TOAR community
diff --git a/toarstats/metrics/stats_utils.py b/toarstats/metrics/stats_utils.py
index 36f4d439999e68e283c7cee7cd766d287efedd97..41b5d5b99ede08104aa2565be465fa5e1716988d 100644
--- a/toarstats/metrics/stats_utils.py
+++ b/toarstats/metrics/stats_utils.py
@@ -301,14 +301,13 @@ def harmonize_time(ser_list, ref, mtype, rsfreq=None):
     :return: A list of series with harmonized datetime indices
     """
     if mtype == "custom":
-        custom_index = pd.DatetimeIndex([ref.index.min().strftime("%Y-%m-%d")])
         for record in ser_list:
-            record["ser"].index = custom_index
+            record["ser"].reindex([ref.index.min()])
     else:
         if rsfreq is None:
             rsfreq = RSTAGS[mtype]
-        tmin = ref.index.min()
-        tmax = ref.index.max()
+        tmin = ref.index.min().strftime("%Y-%m-%d")
+        tmax = ref.index.max().strftime("%Y-%m-%d")
 
         try:
             newindex = pd.date_range(tmin, tmax, freq=rsfreq)