Hello @Prakash Periyasamy
Thank you for reaching out. Currently Purchase/Creation date cannot be retrieved using Azure CLI, REST API or PS. Only way to view the Purchase/Creation date would be to view the details tab on Azure Portal >> Subscription >> Select Specific Subscription >> Properties. Below is the screenshot for your reference:
If you have feature request on this, please feel free to share your feedback here, based on community voting our Product team can prioritize this accordingly.
I hope this helps to resolve your query. Please "Accept the answer" if the information helped you. This will help us and others in the community as well.