varlink: Return all times in RFC 3339 format

This is more consistent and eaiser to parse than the format that
golang's time.String() returns.

Fixes #2260

Signed-off-by: Lars Karlitski <lars@karlitski.net>

libpod/adapter/runtime_remote.go

@@ -6,7 +6,6 @@ import (
 	"bufio"
 	"context"
 	"encoding/json"
-	"fmt"
 	"github.com/pkg/errors"
 	"io"
 	"os"
@@ -113,7 +112,7 @@ func (r *LocalRuntime) GetImages() ([]*ContainerImage, error) {
 }
 
 func imageInListToContainerImage(i iopodman.ImageInList, name string, runtime *LocalRuntime) (*ContainerImage, error) {
-	created, err := splitStringDate(i.Created)
+	created, err := time.ParseInLocation(time.RFC3339, i.Created, time.UTC)
 	if err != nil {
 		return nil, err
 	}
@@ -182,12 +181,6 @@ func (r *LocalRuntime) New(ctx context.Context, name, signaturePolicyPath, authf
 	return newImage, nil
 }
 
-func splitStringDate(d string) (time.Time, error) {
-	fields := strings.Fields(d)
-	t := fmt.Sprintf("%sT%sZ", fields[0], fields[1])
-	return time.ParseInLocation(time.RFC3339Nano, t, time.UTC)
-}
-
 // IsParent goes through the layers in the store and checks if i.TopLayer is
 // the parent of any other layer in store. Double check that image with that
 // layer exists as well.
@@ -251,7 +244,7 @@ func (ci *ContainerImage) History(ctx context.Context) ([]*image.History, error)
 		return nil, err
 	}
 	for _, h := range reply {
-		created, err := splitStringDate(h.Created)
+		created, err := time.ParseInLocation(time.RFC3339, h.Created, time.UTC)
 		if err != nil {
 			return nil, err
 		}