now property
Now moves the observation instant BACKWARDS, RFC 3339. It exists so a BACKTEST can resolve labels as the plane stood at a past moment; without it, every backtest would score a model against knowledge that arrived after the decision it is being scored on. An instant after the server clock is refused: a backtest resolves the past, and a future one would declare unmatured events matured and hand a training set negatives for rows whose chargeback has not had time to arrive.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? now;