rc: fix output of Time values in options/get

Before this change these were output as `{}` after this change they
are output as time strings `"2022-03-26T17:48:19Z"` in standard
javascript format.

fs/parsetime_test.go

@@ -153,3 +153,23 @@ func TestParseTimeUnmarshalJSON(t *testing.T) {
 		assert.Equal(t, Time(test.want), parsedTime, test.in)
 	}
 }
+
+func TestParseTimeMarshalJSON(t *testing.T) {
+	for _, test := range []struct {
+		in   time.Time
+		want string
+		err  bool
+	}{
+		{time.Time{}, `"0001-01-01T00:00:00Z"`, false},
+		{time.Date(2022, 03, 26, 17, 48, 19, 0, time.UTC), `"2022-03-26T17:48:19Z"`, false},
+	} {
+		gotBytes, err := json.Marshal(test.in)
+		got := string(gotBytes)
+		if test.err {
+			require.Error(t, err, test.in)
+		} else {
+			require.NoError(t, err, test.in)
+		}
+		assert.Equal(t, test.want, got, test.in)
+	}
+}