restoreDate 
  The date of the automatic snapshot to use for the new disk. Use the get auto snapshots operation to identify the dates of the available automatic snapshots.
Constraints:
- Must be specified in - YYYY-MM-DDformat.
- This parameter cannot be defined together with the - use latest restorable auto snapshotparameter. The- restore dateand- use latest restorable auto snapshotparameters are mutually exclusive.
- Define this parameter only when creating a new disk from an automatic snapshot. For more information, see the Amazon Lightsail Developer Guide.