所謂時區其實都係1884年喺
國際子午線會議人為定出嚟
事實上後來有科學家提議廢除時差 全世界採用一個時區
https://en.wikipedia.org/wiki/International_Meridian_Conference
https://en.wikipedia.org/wiki/Abolition_of_time_zones
Advantages
The same time is used globally, which removes the requirement of calculations between different zones.
Possible health benefits as people who live on the eastern side of a time zone are out of sync with the circadian rhythms.[1][9]
Disadvantages
The date will change during daylight hours in parts of the Americas and Asia-Pacific.
Requires changes in linguistic terminology related to time.
Conceptually, time zones would still be in effect as different regions would still carry out activities such as business hours, lunch, school, etc. at different UTC times, essentially trading one system for a tantamount one.
The change would likely require a high level of effort from software developers and IT admins around the world, as nearly every modern software system needs to use time information in some fashion.