add training with different times possibility

xclim/sdba/adjustment.py

@@ -284,7 +284,11 @@ def train(cls, ref: DataArray, hist: DataArray, **kwargs) -> TrainAdjust:
         # For some methods, `ref` and `hist` must share the same time array
         if not cls._allow_diff_training_times:
             cls._check_matching_times(ref, hist)
-
+        # We may also use a different time period for `hist` but still require
+        # it has the same size as `ref`'s time.
+        elif not cls._allow_diff_time_sizes: 
+            cls._check_matching_time_sizes(ref, hist)
+            hist["time"] = ref.time
         ds, params = cls._train(ref, hist, **kwargs)
         obj = cls(
             _trained=True,