Time -Wikipedia

Time is a part of the measuring system used to sequence events, 

to compare the durations of events 

and the intervals between them, 

and to quantify rates of change such as the motions of objects. 

The temporal position of events with respect to the transitory present is continually changing; 

future events become present, 

then pass further and further into the past. 

Time has been a major subject of religion, philosophy, and science, 

but defining it in a non-controversial manner applicable 

to all fields of study has consistently eluded the greatest scholars.

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p/s: time changes. situation changes. we changed. no, I did. You didn't.