I have recently moved into wifi App controlled timers - and I love them.
They are basically a unit that you insert into the plug socket in the wall, and then plug the light into the unit.
I get to switch the light on or off manually (using the App on my phone), or set up a lighting shedule across the week.
One major advantage is that I can see, buy glancing at my phone, whether the light is on or off, even from 200 miles away.
Very easy to set up, and very little more expensive than the old versions of timers.
(of course, you can also use the same units for all sorts of things - lamps, radios, coffeemakers... so I bought a set of 4 and have them all in use around the house. Definitely a good buy for me in my circumstances)
: 70litre mature setup; betta, 2 nerites, amano and wood shrimp. Heavily planted.
Valentine’s tank: 22litre cube; betta, 2 amano. Heavily planted.
: 57litre cube; betta, ember tetras, 2 amano, 1 nerite, heavily planted.
200litre tank; honey gourami, cherry barbs, green neons, kuhli loaches, otocinclus, pond snails and 1 assassin doing his thing, heavily planted.