function adjustConstraints(oType, oConstraints) {
		var oAdjustedConstraints = {};

		if (oConstraints) {
			switch (oConstraints.displayFormat) {
				case "Date":
					oAdjustedConstraints.isDateOnly = true;
					break;
				case undefined:
					break;
				default:
					Log.warning("Illegal displayFormat: " + oConstraints.displayFormat,
						null, oType.getName());
			}
			oAdjustedConstraints.nullable = oConstraints.nullable;
		}
		return oAdjustedConstraints;
	}
Adjusts the constraints for DateTimeBase.

@param {sap.ui.model.odata.type.DateTime} oType
  the type
@param {object} [oConstraints]
  constraints, see {@link #constructor}
@returns {object}
  the constraints adjusted for DateTimeBase