Fixing mypy error by setting time_origin at start of __init__

Author: erikvansebille

parcels/tools/converters.py

@@ -54,6 +54,7 @@ class TimeConverter:
     """
 
     def __init__(self, time_origin: float | np.datetime64 | np.timedelta64 | cftime.datetime = 0):
+        self.time_origin = time_origin
         self.calendar: str | None = None
         if isinstance(time_origin, np.datetime64):
             self.time_origin = time_origin
@@ -64,8 +65,6 @@ def __init__(self, time_origin: float | np.datetime64 | np.timedelta64 | cftime.
         elif isinstance(time_origin, cftime.datetime):
             self.time_origin = time_origin
             self.calendar = time_origin.calendar
-        else:
-            self.time_origin = time_origin
 
     def reltime(self, time: TimeConverter | np.datetime64 | np.timedelta64 | cftime.datetime) -> float | npt.NDArray:
         """Method to compute the difference, in seconds, between a time and the time_origin