For all those who are used to saying that reading a certain comment or watching a certain video killed their time that would never come back need to revisit that thought. 30th June this year marks the day when one additional second will be added in the day. That would marginally stretch the hour prior to the clock striking midnight 3,601 seconds long. These are usually called, leap seconds.
Similar to leap years that occur due to Earth not taking precisely 365 days to revolve around the sun, leap seconds accord time with nature. It would be far better to have the orbit and the spin accurately aligned but we just can’t get everything in life, can we now? Ancient instruments calculated leap year to occur after every four years.
Leap seconds have become a need under slightly different circumstances, though. The rate of spin of the Earth marginally varies compared to the gravitational effect of other planets. On several days it spins slightly slower than the day before, losing about 0.002 seconds per day on average. If you sum up all these, you would notice that the Earth would experience complete darkness at noon while sun at midnight.
In light of variations in this loss, the International Earth Rotation and Reference Systems Service decide when an extra second might be needed. It is equally necessary to ensure clocks all over the world register this change. Interestingly, plenty of renowned websites have made awry attempts at keeping up with leap second changes. In the modern day, you would not expect this to be such an uphill task.
The complications involved in the process have convinced many to speak out against leap seconds. The argument that it will be many centuries before the clocks no longer remain synced with the Earth is a valid one. On the contrary, you might want to consider if putting off long term problems like this is going to lead in serious repercussions for the generations to come.