Added pretty printing for time.Time.

format/format.go

diff --git a/format/format.go b/format/format.go
index 5cd89bc..fde341f 100644
--- a/format/format.go
+++ b/format/format.go
@@ -40,6 +40,7 @@
 }
 
 var contextType = reflect.TypeOf((*Ctx)(nil)).Elem()
+var timeType = reflect.TypeOf(time.Time{})
 
 //The default indentation string emitted by the format package
 var Indent = "    "
@@ -179,6 +180,10 @@
 	case reflect.Map:
 		return formatMap(value, indentation)
 	case reflect.Struct:
+		if value.Type() == timeType {
+			t, _ := value.Interface().(time.Time)
+			return t.Format(time.RFC3339Nano)
+		}
 		return formatStruct(value, indentation)
 	case reflect.Interface:
 		return formatValue(value.Elem(), indentation)

format/format_test.go

diff --git a/format/format_test.go b/format/format_test.go
index 4d4b36c..a27cea2 100644
--- a/format/format_test.go
+++ b/format/format_test.go
@@ -380,6 +380,13 @@
 				Ω(Object(s, 1)).Should(matchRegexp(`format_test\.ComplexStruct`, expected))
 			})
 		})
+
+		Describe("formatting times", func() {
+			It("should format time as RFC3339", func() {
+				t := time.Date(2016, 10, 31, 9, 57, 23, 12345, time.UTC)
+				Ω(Object(t, 1)).Should(match("time.Time", `2016-10-31T09:57:23.000012345Z`))
+			})
+		})
 	})
 
 	Describe("Handling unexported fields in structs", func() {