Format times in inspect command with a template as RFC3339Nano

In 1.6.2 we were decoding inspect API response into interface{}.
time.Time fields were JSON encoded as RFC3339Nano in the response
and when decoded into interface{} they were just strings so the inspect
template treated them as just strings.
From 1.7 we are decoding into types.ContainerJSON and when the template
gets executed it now gets a time.Time and it's formatted as
2015-07-22 05:02:38.091530369 +0000 UTC.
This patch brings back the old behavior by typing time.Time fields
as string so they gets formatted as they were encoded in JSON -- RCF3339Nano

Signed-off-by: Antonio Murdaca <runcom@linux.com>

api/types/types.go

@@ -86,7 +86,7 @@ type ImageInspect struct {
 	Id              string
 	Parent          string
 	Comment         string
-	Created         time.Time
+	Created         string
 	Container       string
 	ContainerConfig *runconfig.Config
 	DockerVersion   string
@@ -215,14 +215,14 @@ type ContainerState struct {
 	Pid        int
 	ExitCode   int
 	Error      string
-	StartedAt  time.Time
-	FinishedAt time.Time
+	StartedAt  string
+	FinishedAt string
 }
 
 // GET "/containers/{name:.*}/json"
 type ContainerJSONBase struct {
 	Id              string
-	Created         time.Time
+	Created         string
 	Path            string
 	Args            []string
 	State           *ContainerState

daemon/inspect.go

@@ -2,6 +2,7 @@ package daemon
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/docker/docker/api/types"
 )
@@ -91,13 +92,13 @@ func (daemon *Daemon) getInspectData(container *Container) (*types.ContainerJSON
 		Pid:        container.State.Pid,
 		ExitCode:   container.State.ExitCode,
 		Error:      container.State.Error,
-		StartedAt:  container.State.StartedAt,
-		FinishedAt: container.State.FinishedAt,
+		StartedAt:  container.State.StartedAt.Format(time.RFC3339Nano),
+		FinishedAt: container.State.FinishedAt.Format(time.RFC3339Nano),
 	}
 
 	contJSONBase := &types.ContainerJSONBase{
 		Id:              container.ID,
-		Created:         container.Created,
+		Created:         container.Created.Format(time.RFC3339Nano),
 		Path:            container.Path,
 		Args:            container.Args,
 		State:           containerState,

graph/service.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"io"
 	"runtime"
+	"time"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/docker/docker/api/types"
@@ -34,7 +35,7 @@ func (s *TagStore) Lookup(name string) (*types.ImageInspect, error) {
 		Id:              image.ID,
 		Parent:          image.Parent,
 		Comment:         image.Comment,
-		Created:         image.Created,
+		Created:         image.Created.Format(time.RFC3339Nano),
 		Container:       image.Container,
 		ContainerConfig: &image.ContainerConfig,
 		DockerVersion:   image.DockerVersion,

integration-cli/docker_cli_inspect_test.go

@@ -5,6 +5,7 @@ import (
 	"os/exec"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/docker/docker/api/types"
 	"github.com/go-check/check"
@@ -260,3 +261,28 @@ func (s *DockerSuite) TestInspectBindMountPoint(c *check.C) {
 		c.Fatalf("Expected rw to be false")
 	}
 }
+
+// #14947
+func (s *DockerSuite) TestInspectTimesAsRFC3339Nano(c *check.C) {
+	out, _ := dockerCmd(c, "run", "-d", "busybox", "true")
+	id := strings.TrimSpace(out)
+	startedAt, err := inspectField(id, "State.StartedAt")
+	c.Assert(err, check.IsNil)
+	finishedAt, err := inspectField(id, "State.FinishedAt")
+	c.Assert(err, check.IsNil)
+	created, err := inspectField(id, "Created")
+	c.Assert(err, check.IsNil)
+
+	_, err = time.Parse(time.RFC3339Nano, startedAt)
+	c.Assert(err, check.IsNil)
+	_, err = time.Parse(time.RFC3339Nano, finishedAt)
+	c.Assert(err, check.IsNil)
+	_, err = time.Parse(time.RFC3339Nano, created)
+	c.Assert(err, check.IsNil)
+
+	created, err = inspectField("busybox", "Created")
+	c.Assert(err, check.IsNil)
+
+	_, err = time.Parse(time.RFC3339Nano, created)
+	c.Assert(err, check.IsNil)
+}