"X-Amz-Date":           now.AddDate(0, 0, -2).Format(iso8601Format),
				"X-Amz-Content-Sha256": payloadSHA256,
			},
			region:   region,
			expected: ErrExpiredPresignRequest,
		},
		// (5) Should error if the signature is incorrect.
		{
			queryParams: map[string]string{
				"X-Amz-Algorithm":      signV4Algorithm,
				"X-Amz-Date":           now.Format(iso8601Format),
				"X-Amz-Expires":        "60",

	iso8601TimeFormatLong = "2006-01-02T15:04:05.000000Z" // Reply date format with nanosecond precision.
)

// ISO8601Format converts time 't' into ISO8601 time format expected in AWS S3 spec.
//
// This function is needed to avoid a Go's float64 precision bug, where Go avoids
// padding the extra '0' before the timezone.
func ISO8601Format(t time.Time) string {
	value := t.Format(iso8601TimeFormat)
	if len(value) < len(iso8601TimeFormat) {

	"github.com/minio/minio/internal/hash/sha256"
	xhttp "github.com/minio/minio/internal/http"
)

// AWS Signature Version '4' constants.
const (
	signV4Algorithm = "AWS4-HMAC-SHA256"
	iso8601Format   = "20060102T150405Z"
	yyyymmdd        = "20060102"
)

type serviceType string

const (
	serviceS3  serviceType = "s3"
	serviceSTS serviceType = "sts"
)

			}
			// validating presign date field.
			if testCase.expectedPreSignValues.Date.UTC().Format(iso8601Format) != parsedPreSign.Date.UTC().Format(iso8601Format) {
				t.Errorf("Test %d: Expected date to be %v, but got %v", i+1, testCase.expectedPreSignValues.Date.UTC().Format(iso8601Format), parsedPreSign.Date.UTC().Format(iso8601Format))
			}
		}

	}

		ETag:         "\"" + etag + "\"",
		LastModified: amztime.ISO8601Format(lastModified.UTC()),
	}
}

// generates CopyObjectPartResponse from etag and lastModified time.
func generateCopyObjectPartResponse(etag string, lastModified time.Time) CopyObjectPartResponse {
	return CopyObjectPartResponse{
		ETag:         "\"" + etag + "\"",
		LastModified: amztime.ISO8601Format(lastModified.UTC()),
	}
}

	if src > lcEventSrc_None {
		tags[ilmSrc] = src.String()
	}
	tags[ilmAction] = event.Action.String()
	tags[ilmRuleID] = event.RuleID

	if !event.Due.IsZero() {
		tags[ilmDue] = event.Due.Format(iso8601Format)
	}

	// rule with Transition/NoncurrentVersionTransition in effect
	if event.StorageClass != "" {
		tags[ilmTier] = event.StorageClass
	}

	// rule with NewernoncurrentVersions in effect

			expectedOutput: "2009-11-13T04:51:01.941Z",
		},
	}

	for _, testCase := range testCases {
		testCase := testCase
		t.Run(testCase.expectedOutput, func(t *testing.T) {
			gotOutput := ISO8601Format(testCase.date)
			t.Log("Go", testCase.date.Format(iso8601TimeFormat))
			if gotOutput != testCase.expectedOutput {
				t.Errorf("Expected %s, got %s", testCase.expectedOutput, gotOutput)
			}
		})
	}

	if aec != ErrNone {
		return psv, aec
	}

	var e error
	// Save date in native time.Time.
	preSignV4Values.Date, e = time.Parse(iso8601Format, query.Get(xhttp.AmzDate))
	if e != nil {
		return psv, ErrMalformedPresignedDate
	}

	// Save expires in native time.Duration.
	preSignV4Values.Expires, e = time.ParseDuration(query.Get(xhttp.AmzExpires) + "s")

	hashedChunk := hex.EncodeToString(cr.chunkSHA256Writer.Sum(nil))

	// Calculate string to sign.
	alg := signV4ChunkedAlgorithm + "\n"
	stringToSign := alg +
		cr.seedDate.Format(iso8601Format) + "\n" +
		getScope(cr.seedDate, cr.region) + "\n" +
		cr.seedSignature + "\n" +
		emptySHA256 + "\n" +
		hashedChunk

	// Get hmac signing key.

package amztime

import (
	"errors"
	"net/http"
	"time"
)

// Supported amz date formats.
var amzDateFormats = []string{
	// Do not change this order, x-amz-date format is usually in
	// iso8601Format rest are meant for relaxed handling of other
	// odd SDKs that might be out there.
	"20060102T150405Z",
	time.RFC1123,
	time.RFC1123Z,
	// Add new AMZ date formats here.
}