allow non-standards fallback for all http.TimeFormats (#15662)

fixes #15645

cmd/fs-v1-metadata.go

@@ -23,12 +23,11 @@ import (
 	"encoding/json"
 	"io"
 	"io/ioutil"
-	"net/http"
 	"os"
 	pathutil "path"
-	"time"
 
 	jsoniter "github.com/json-iterator/go"
+	"github.com/minio/minio/internal/amztime"
 	xhttp "github.com/minio/minio/internal/http"
 	"github.com/minio/minio/internal/lock"
 	"github.com/minio/minio/internal/logger"
@@ -175,12 +174,9 @@ func (m fsMetaV1) ToObjectInfo(bucket, object string, fi os.FileInfo) ObjectInfo
 	} else {
 		objInfo.StorageClass = globalMinioDefaultStorageClass
 	}
-	var (
-		t time.Time
-		e error
-	)
+
 	if exp, ok := m.Meta["expires"]; ok {
-		if t, e = time.Parse(http.TimeFormat, exp); e == nil {
+		if t, e := amztime.ParseHeader(exp); e == nil {
 			objInfo.Expires = t.UTC()
 		}
 	}