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

 

Aukus: Australia defends role in security pact amid French condemnation (19 Sep 2021)

 

Afghanistan: Stay home, female Kabul government workers told (19 Sep 2021)

 

Manny Pacquiao: Boxing star to run for Philippines president (19 Sep 2021)

 

Afghanistan: The 'shattered dreams' of the Ariana cabin crew (18 Sep 2021)

 

Johannesburg mayor Jolidee Matongo killed in car crash (19 Sep 2021)

 

Volcano on Canary Island La Palma erupts, spewing ash and lava into national park (19 Sep 2021)

 

History-making space tourists splash down to Earth (19 Sep 2021)

 

Russia election: Opposition complaints on final day of voting (19 Sep 2021)

 

Police outnumber protesters at right-wing Capitol rally (19 Sep 2021)

 

Migrants in Texas: Thousands moved to processing centres (19 Sep 2021)

more »

 

SF Gate

 

13 Best Background Check Sites & Services: Search Criminal Records and Social Media Accounts Online (28 Jul 2021)

 

It pays to search for top-quality auto shop (6 Feb 2021)

 

Fired Boeing CEO is now working with Bay Area tractor startup (14 Dec 2020)

 

PG&E bills to rise over per year on average to fund wildfire risk reduction (5 Dec 2020)

 

Nasdaq seeks more diversity on boards of companies listed on exchange (2 Dec 2020)

 

Elizabeth Holmes Prosecutors Say Texts Show Theranos Beset With Problems (24 Nov 2020)

more »


Site feed Updated: 2021-Sep-15 12:00