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

 

Florida school shooting: Armed officer 'did not confront killer' (23 Feb 2018)

 

Barnaby Joyce: Scandal-hit Australia deputy PM to resign (23 Feb 2018)

 

Trump-Russia: New charges for Paul Manafort and Rick Gates (22 Feb 2018)

 

Syria war: Children struggle to survive in Eastern Ghouta (23 Feb 2018)

 

Sipping acidic fruit teas can wear away teeth, says study (23 Feb 2018)

 

Syria war: Russia says no agreement on ceasefire resolution (23 Feb 2018)

 

Dutch MPs vote to recognise disputed Armenian 'genocide' (22 Feb 2018)

 

Unicef deputy resigns after allegations (22 Feb 2018)

 

Komla Dumor Award 2018: Seeking a rising star of African journalism (23 Feb 2018)

 

Does this bodycam show a man killed by a cop had a gun? (23 Feb 2018)

more »

 

SF Gate

 

Bay Area News (7 Jan 2012)

 

City Insider (11 Feb 2012)

 

Crime Scene (13 Feb 2012)

 

C.W Newius Column (10 Jan 2012)

 

C.W. Nevius Blog (11 Feb 2012)

 

Education News (10 Jan 2012)

 

KALW (11 Feb 2012)

 

Matier and Ross Blog (11 Feb 2012)

 

Corporate whistle-blower protections cut by U.S. high court (22 Feb 2018)

 

The making of a No. 1 YouTube conspiracy video after the Parkland tragedy (22 Feb 2018)

 

Hershey and pot; Twitter and bot; blockchain or not? (22 Feb 2018)

 

After tweet by Kylie Jenner, Snapchat's market value tanked by .3 billion (22 Feb 2018)

 

Ship traffic, Feb. 23 (22 Feb 2018)

 

Trump says he may pull ICE from California (22 Feb 2018)

more »

 


Site feed Updated: 2018-Feb-22 21:00