The SRians Said: Time is What the Clock Measures

The SRians Said: Time is What the Clock Measures

This definition for time implies that a clock second represents the same
"duration" (universal time?) in all frames. The SRians compare the passage
of clock seconds directly in the twin paradox scenario confirms this
interpretation for time..

Question:
Does this mean that a clock second is an interval of universal time?

Ken Seto