If you say so

Apparently, we observe the leap second this year in December.

A leap second is an intercalary, one-second adjustment that keeps broadcast standards for time of day close to mean solar time. Leap seconds are used to keep time standards synchronized with civil calendars, the basis of which is astronomical.

Broadcast standards for civil time are based on Coordinated Universal Time (UTC), which is maintained using extremely precise atomic clocks. In order to keep the UTC broadcast standard close to mean solar time, UTC is occasionally corrected by an intercalary adjustment, or "leap", of one (1) second. Over long time periods, leap seconds must be added at an ever increasing rate which corresponds to a parabola near 31 s/century²