time as a concept is an aspect of our reality whereby all events we observe appear "unidirectional"
MEASUREMENT of time is a human construct based on the passing of our 24 hour 365 day cycles of day and night and seasons
it was invented long ago and must be adjusted to account for variations in the cycles and our calculation methods
we have reason to believe that time is MORE complex than we perceive and in fact constitutes a dimension of reality - along with additional possible dimensions
at this time real human comprehension of such matters is not possible - only an idea or vague image of reality
think infinity - used all the time in math but no human really can truly grasp what that is - for complete sauce see herbert spencer essay on "what is knowable"