Stephen Hawking wrote a book introducing time to readers that are not familiar with physics or math.
Called "A Brief History of Time." it has one equation, E = mc2
Only one equation because the more equations you have, the fewer readers you get, it's a publishing equation. People don't want to spend time learning equations.
We see time in this equation.
It's c, the speed of light. Light is the fastest thing. It's why eyesight is so handy, it gives us information faster from further away than other methods such as sound.
299,792,458 metres per second. Distance over time.
Light is how we see time.
At the going down of the sun and the minute hand of the clock, we time time with milestones we can see.
Time doesn't change what it does. But we need to leave a knotted cord behind us as we venture into the labyrinth of the future. And for this, a visual record of time is very useful.
By synchronising our watches, and our definition of time, we can organise ourselves better and arrange to ambush the wooly mammoths at the same time, or get to our Monday marketing meeting on time.
But our rule of thumb may not be what time is. This method of comparing and counting our ticks and our tocks and making sure we are all ticking and tocking at the same time, is just a handy tool to sequence our actions in the world.
That even as we think there are things that are reliable enough to count out our years, that these things are an illusion. Our planet goes around our star a little bit differently every year, and our star is moving through space as we move around it.
Timekeeping is our illusion. There is no perfect watch.