Can you explain why you favor this, and why you have to use it in your job?
The Congress shall have power to … fix the Standard of Weights and Measures …The Congress, not a foreign body such as the International Bureau of Weights and Measures (headquarters Paris, France). Never mind who controls what is now known as coordinated universal time (UTC), that being the International Telecommunications Union, control of which was handed over to the UN in 1949.
— US Constitution, Article I, Section 8, Clause 5
My professional involvement was working with different time scales for satellite tracking and missile defense. I was involved in a test with the Missile Defense Agency, where they had a simulated mission, an integrated ground test, involving dozens of contractors, that straddled a leap second. Hilarity ensued. (Our system was fine.) I wrote and implemented the procedure for accounting for leap seconds on a large space-track/missile defense radar. It was klugey but effective. We had at least three time scales active in the radar at any time. In addition, our interface with MDA required that messages be time tagged with UTC time, but track states be time tagged with GPS time. (GPS time is a time scale that lags TAI - international atomic time - by 19 seconds.) UTC is offset from TAI by an integer number of leap seconds.
A further complication is satellite tracking. We are rated and compensated (paid) by the number and quality of satellite tracks we produce. We depend on NORAD two-line element sets (TLE) for acquisition. TLE express time as days since midnight January 1st, to eight decimal places, better than a millisecond precision. Noon on January 2 is 1.50000000. The time scale is UT (which one they don’t say, but apparently UT1). We generally only spend one second looking, and we only keep track of UTC, so the offset which is often more than half a second is a large part of our budget. On top of that TLE are only accurate to about 5 km, and satellites can move at 7 km/sec, so any slop in time scales can be costly.
Other than that, no concerns.
Not OP, but precise time measurements are useful in several industries. For some folks, like if you have to communicate with GPS satellites, work on high speed trades on the stock market, or keep cell towers operating correctly. Usually it has something to do with measuring the speed or the distance messages travel between two points. If you know the time a message is sent and received, you can make calculations about distance or speed from that information.
For most people though, it's ok if your truck's clock is off by an hour six months out of the year because you don't know how to reset it for daylight saving time.
You guys are the ones who are always late, right?
:)