tungwaiyip.info

home

about me

links

Blog

< September 2016 >
SuMoTuWeThFrSa
     1 2 3
4 5 6 7 8 910
11121314151617
18192021222324
252627282930 

past articles »

Click for San Francisco, California Forecast

San Francisco, USA

 

Let's meet at 1am

My work needs me to setup computer system to work across the globe. A key issue is to have a common time reference. This gets tricky because of time zone. Just saying 12pm is imprecise. Which time zone is 12pm reference to? Is it 12pm in San Francisco? Or 12pm in London? Another complication is day light saving adjustment, which make time measure more irregular.

The standard practice is to use Coordinated Universal Time (UTC), i.e. Greenwich Mean Time. So everyone across the globe has a reference to the same standard time. Having a standard reference is great for computer system. But for us software engineers it is another quantity to juggle with. I often have to track time across systems. If the system responses something like 14:22, it is still hard to make sense of. Is it this afternoon? This morning? Or sometime in the future? Translating between local time and UTC is often necessity for me. But it is much harder to do mentally compares to, say translating between metrics and imperial unit.

One tip is I added a clock of Reykjavik, Iceland time on my cellphone. Iceland time happens to match UTC and Icelanders do not mess with daylight saving time. This gives me a easy read of current UTC time (8pm now, which is 1pm San Francisco time.)

I have a colleague who argues strongly that the entire world should adopt UTC time in actual daily use and do away with time zone. Standardization is probably very important for him. How practical is this for regular people? To this I said, let's have a meeting at 1am, UTC time (it is 6pm for your reference).

2016.09.08 comments

 

 

blog comments powered by Disqus

past articles »

 

BBC News

 

Salman Rushdie stabbing suspect charged with attempted murder (13 Aug 2022)

 

Who is Salman Rushdie? The writer who emerged from hiding (13 Aug 2022)

 

Ukraine says it has taken out vital bridge in occupied Kherson (13 Aug 2022)

 

Taliban break up rare protest by Afghan women in Kabul (13 Aug 2022)

 

Medusa festival: High speeds winds cut Spanish festival short (13 Aug 2022)

 

Climate activists fill golf holes with cement after water ban exemption (13 Aug 2022)

 

Trump search warrant: FBI took top secret files from Mar-a-Lago (13 Aug 2022)

 

Climate change: Drought highlights dangers for electricity supplies (13 Aug 2022)

 

Southern Baptist abuse claims under DoJ investigation (13 Aug 2022)

 

Kenya elections 2022: Raila Odinga and William Ruto in tight presidential race (13 Aug 2022)

more »

 

SF Gate

 

These were the highest-paying Silicon Valley tech companies in 2021 (19 Jul 2022)

 

'This will be somewhat painful': Elon Musk talks Twitter takeover in extended interview at TED2022 Vancouver (14 Apr 2022)

 

Best Background Check Services in 2022, Top 13 People Finder Sites Reviewed (5 Apr 2022)

 

Better.com employees got severance checks before they were laid off (9 Mar 2022)

 

Apple joins other Bay Area tech giants in responding to Russian invasion of Ukraine (1 Mar 2022)

 

Uber will now show you how you’re rated by drivers (18 Feb 2022)

more »


Site feed Updated: 2022-Aug-13 15:00