Amazon.S3.AmazonS3Client.GetSecondsUntilExpiration C# (CSharp) Метод

        private static long GetSecondsUntilExpiration(GetPreSignedUrlRequest request, bool aws4Signing)
        {
            var baselineTime = aws4Signing ? AWSSDKUtils.CorrectedUtcNow : new DateTime(1970, 1, 1);
            return Convert.ToInt64((request.Expires.ToUniversalTime() - baselineTime).TotalSeconds);
        }