agreed ... there is no absolute ‘time’ based upon our visual/physical perceptions being caught up within one set of assumptions while a whole new set of times is only a few yards away from our awareness, perhaps. It is there because the differential difference can be measured or perceived ... the problem is which time is time if there is no absolute ‘time’ which when Einstein viewed time probably came to the conclusion ‘time’ was too complex to be consider ‘absolute’? Unknown ...
There is no such thing as 'time' all on its own. Time depends on the observer's state of motion. Space and Time are intimately linked. "space-time".