Implementing review suggestion

Author: erikvansebille

src/parcels/_core/particleset.py

@@ -15,7 +15,7 @@
 from parcels._core.statuscodes import StatusCode
 from parcels._core.utils.time import (
     TimeInterval,
-    float_to_datetime,
+    float_to_datelike,
     timedelta_to_float,
 )
 from parcels._core.warnings import ParticleSetWarning
@@ -523,7 +523,7 @@ def execute(
                         next_output += outputdt * sign_dt
 
             if verbose_progress:
-                pbar.set_description("Integration time: " + str(float_to_datetime(time, self.fieldset.time_interval)))
+                pbar.set_description("Integration time: " + str(float_to_datelike(time, self.fieldset.time_interval)))
                 pbar.update(next_time - time)
 
             time = next_time

src/parcels/_core/utils/time.py

@@ -163,8 +163,8 @@ def timedelta_to_float(dt: float | timedelta | np.timedelta64) -> float:
     return float(dt)
 
 
-def float_to_datetime(dt: float, time_interval) -> np.datetime64:
-    """Convert a float time (in seconds from the start of the time_interval) to a datetime"""
+def float_to_datelike(dt: float, time_interval) -> np.datetime64 | np.timedelta64:
+    """Convert a float time (in seconds from the start of the time_interval) to a datetime (if time_interval is a datetime object) or timedelta (otherwise)"""
     if time_interval:
         return np.timedelta64(int(dt), "s") + time_interval.left
     else: