When was a block blob created in azure?
<p>The blob reference contains a <code>Properties</code> property that has a <code>LastModified</code> of <code>DateTimeOffset?</code>. However, I can't find when was the creation date(time) of the blob. Is there a standard API I can use or I need to store that in the meta?</p>

<pre><code>    public async Task&lt;IBlobMeta&gt; GetBlobMetaAsync(string blobId)
        {
            if (IsNullOrWhiteSpace(blobId))
                throw new ArgumentException("Value cannot be null or whitespace.", nameof(blobId));

            var blob = await EnsureGetBlobById(blobId);
            await blob.FetchAttributesAsync();

            string clientBlobName;
            blob.Metadata.TryGetValue(BlobNameMetaKey, out clientBlobName);

            var length = blob.Properties.Length;
            var md5 = blob.Properties.ContentMD5;
            var lastModified = blob.Properties.LastModified.Value.ToUniversalTime().DateTime;
            var dateCreated= blob.Properties.???????;
            return new AzureBlobMeta(blobId, clientBlobName, length, md5, dateCreated);
  }
</code></pre>