It is easier to express the concept of time in units dating back to Sumerians. In the SI unit system, the time unit is seconds and is defined by the vibration frequency of the cesium atom.
We can start with a day to measure time. One day, that is, 24 hours is the time to complete the Earth's rotation around itself. Another measure is the transformation of the Earth around the Sun. He completes this turn in 1 year.
With this calculation tool, you can cycle between seconds, minutes, hours, days, weeks, months and years.