Formal:
* Lihis sa panahon - Literally "out of time"
* Nawawalan ng bisa - Literally "losing its validity"
* Hindi na ginagamit - Literally "no longer used"
Informal:
* Luma na - Literally "old already"
* Hindi na uso - Literally "not in fashion anymore"
The best translation will depend on the specific situation and the level of formality required.