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object is modified so that it represents a point in time within the specified second of the minute, with the year, month, date, hour, and minute the same as before, as interpreted in the local time zone.
In UTC, however, about once every year or two there is an extra second, called a "leap second." The leap second is always added as the last second of the day, and always on December 31 or June 30.
The distinction between UTC and UT is that UTC is based on an atomic clock and UT is based on astronomical observations, which for all practical purposes is an invisibly fine hair to split.
Because the earth's rotation is not uniform (it slows down and speeds up in complicated ways), UT does not always flow uniformly.
If you work in astronomy, or rocket science this may not be precise enough for you. For Physicists it is a dimension tightly coupled with space (spacetime). Even if it did not we were probably unable to tell because we lack something to compare it to.
Time as a physical property (or dimension) passes uniformly. We simply can't define how fast time passes - we live inside of it.