Create date_onset Property in cardio_metabolic_disorders.py

src/tlo/methods/cardio_metabolic_disorders.py

@@ -301,6 +301,9 @@ def __init__(self, name=None, do_log_df: bool = False, do_condition_combos: bool
         self.lms_event_death = dict()
         self.lms_event_symptoms = dict()
 
+        # Dictionary to hold date onset
+        self.diabetes_onset_dates = {}
+
     def read_parameters(self, resourcefilepath: Optional[Path] = None):
         """Read parameter values from files for condition onset, removal, deaths, and initial prevalence.
 
@@ -1058,6 +1061,12 @@ def schedule_death_to_occur_before_next_poll(p_id, cond):
             idx_acquires_condition = acquires_condition[acquires_condition].index
             df.loc[idx_acquires_condition, f'nc_{condition}'] = True
 
+            # Store onset dates only for diabetes
+            if condition == 'nc_diabetes':
+                for person_id in idx_acquires_condition:
+                    if person_id not in self.module.diabetes_onset_dates:
+                        self.module.diabetes_onset_dates[person_id] = self.sim.date
+
             # Add incident cases to the tracker
             self.module.trackers['onset_condition'].add(
                 condition, df.loc[idx_acquires_condition].groupby('age_range').size().to_dict()