We do have CLI/REST where we can schedule deployments:
https://www.ibm.com/docs/en/urbancode-deploy/7.1.2?topic=commands-requestapplicationprocess
https://www.ibm.com/docs/en/urbancode-deploy/7.1.2?topic=resource-run-application-process
But we do not have a supported CLI/REST to update the date or time of a scheduled deployment.
I have reviewed the old RFE communitiy and none of customers requested this feature before.
Please submit a request for this feature to be included in the future releases of UCD CLI/Rest commands using the UrbanCode ideas in the Aha! Portal:
https://cloud-platform.ideas.aha.io/?project=URBANCODE
#Support#UrbanCodeDeploy#SupportMigration