This article explains the importance of time synchronisation in modern computer networks and explores NTP (Network Time Protocol) and how it is used.

Time
servers are like other computer servers in the sense they are usually located
on a network. A time server gathers timing information, usually from an
external hardware source and then synchronises the network to that time.

Often time
servers are synchronised to a UTC (Coordinated Universal time) source which is
the global standard time scale and allows computers all over the world to
synchronised to exactly the same time. This has obvious importance in
industries where exact timing is crucial such as the stock exchange or airline
industry.

This article explains the world’s global timescale - UTC (Coordinated Universal Time)  what it is, why it was adopted and how important it is now.

What time is it? One of the commonest questions uttered
around the World but what exactly are we asking? You ask someone in China what
the time is then you will certainly get a different answer if you ask an
American, obviously their time-zones are on the opposite side of the world. 

But what if you ask two people in the same room as you? You
may get the same answer from them both but then again one person’s watch may be
a minute or two faster.