By 'time' I assume you mean long time; days, weeks months years etc and not short time (minutes/hours etc) tho they are now all interconnected (along with space).
Much of the dates we read about nowadays were calculated retroactively, form a more modern timeline.
The first recorded history is generally accepted to be the first mention of dates and it is about 24 June 1312 BC during the rein of a Hittite king Mursilis II. In those days, time was was kept in relation to how long a family or individual ruler stayed in power or lived.
But, there are cave pictographs and cuneiform writings that mention seasons older than Mursilis II rein.
Time is poorly understood by many of us, as it involves space (distance). For instance, what we (or astronomers) may see in the night sky regarding distant stars, we may say "I watched a star explode last night". Well, yes and no. You did watch it last night, but it didn't explode last night. It actually exploded long long ago and the visible light from the event is just now reaching us. The nearest star for instance... Alpha Centuri is 4 light years away. That means the light we see from it was really emitted 4 years ago. A light year is not a measure of time, but of distance or length. The distance that light travels in a vacuum in 1 Julian calendar year. If converted to US miles, 1 light year = 5.9 trillion miles.
There has been much recent speculation about a star in our night sky (Betelgeuse) . It has been flickering in a strange way and scientist speculate it may (or may not) be in the death throes of a supernova (explode). Since it lies about 430 light years from Earth, it's possible it already has exploded and light just hasn't told us yet.