I have two 2 KG ABC ones in car, 1 large ABC in kitchen, and use BCF which is awsome, but illegal in the garage, only the MOD are allowed to use BCF now due to environmental reasons, and they have some mother extinguishers, that you need two hands top drag around on wheels.
As to dates of things it depnds on whether they are STORED PRESSURE or CANISTER, if canister they will still have the pressure there in the canister but if stored pressure it will lose it over time.
Powder extinguishers should be vigorously shaken every 6 months to unsettle powder, FIRE ex makers such as UK FIRE mark their dates with coloured press in buttons in the handles.
You should see what happens when some ABSOLUTE MORON throws WATER over a chip pan fire, it EXPLODFES BIG time.
So long as you can eliminate one of the THREE components of FIRE, ie the TRIANGLE, you will stop it.
TRIANGLE = FUEL/HEAT/OXYGEN.
More people are killed by smoke inhalation than by fire itself, which is why I have a SMOKE ALARM in EVERY ROOM, except the kitchen, and a stock of 9v batteries, they beep when battery starts to go flat.
tabetha