Returns metadata for the object only if it has been modified since the specified time,
otherwise returns a PreconditionFailed signal.

C# |
[ObsoleteAttribute("The With methods are obsolete and will be removed in version 2 of the AWS SDK for .NET. See http://aws.amazon.com/sdkfornet/#version2 for more information.")] public GetObjectMetadataRequest WithModifiedSinceDate( DateTime modifiedSinceDate )

- modifiedSinceDate (DateTime)
- Date and time to be tested

this instance

When this is set the S3 object metadata is returned only if it has been modified since the specified time,
otherwise returns a 304 (not modified).