Fixing date as version

Author: adrian05-ms

.azure-pipelines/msgraph-reference-generation.yml

@@ -194,5 +194,5 @@ extends:
                 RepoName: 'microsoftgraph/typespec-msgraph'
                 scriptDir: $(Build.SourcesDirectory)\msgraph-metadata\.azure-pipelines\scripts
                 # Adding date as Version to keep up with the schema sync PRs.
-                Date: $(Get-Date -Format "yyyy-MM-dd")
+                Date: $[format('{0:yyyy-MM-dd}', pipeline.startTime)]
               workingDirectory: '$(Build.SourcesDirectory)/typespec-msgraph'