UTC is defined to be within 1s of mean solar time at 0deg longitude (= UT1).
If leap seconds are a problem for the intended application then UTC is the wrong thing to use. There are other scales that are defined differently that can be used in it's place (such as TAI).
However if exact frequency is not critical one could also directly use UT1 instead of UTC (people that use leap second smearing for instance should have no issue with that..).
If leap seconds are a problem for the intended application then UTC is the wrong thing to use. There are other scales that are defined differently that can be used in it's place (such as TAI).
However if exact frequency is not critical one could also directly use UT1 instead of UTC (people that use leap second smearing for instance should have no issue with that..).