Time/date format: back to relative timestamps storage

src/View/BoundaryCondition/Edit/Table.py

@@ -94,11 +94,11 @@ class TableModel(PamhyrTableModel):
                     v = v.replace(',', '.')
                 value = f"{float(v):.4f}"
             elif self._data.header[column] == "time":
-                if self._opt_data == "time":
+                if self.time_system == "time":
                     value = timestamp_to_old_pamhyr_date(int(v))
                 else:
                     value = format_datetime(
-                        datetime(1970, 1, 1) + timedelta(seconds=float(v))
+                        parse_datetime(self.start_date) + timedelta(seconds=float(v))
                     )
             else:
                 value = f"{v}"
@@ -117,8 +117,8 @@ class TableModel(PamhyrTableModel):
 
         try:
             if (self._data.header[column] == "time"
-                    and self._opt_data == "date"):
-                value = self.date_to_timestamp(value)
+                    and self.time_system == "date"):
+                value = self.date_to_elapsed_seconds(value)
 
             row = self.get_true_data_row(row)