[tz] time and cost to reprogram computers for DST in Japan

Tom Lane tgl at sss.pgh.pa.us
Fri Aug 17 19:13:59 UTC 2018

Howard Hinnant <howard.hinnant at gmail.com> writes:
> On Aug 17, 2018, at 3:53 AM, Paul Eggert <eggert at cs.ucla.edu> wrote:
>> "The biggest hurdle in Japan to putting daylight saving time in place is the cost and workload required to adjust computer systems. Professor Tetsutaro Uehara of Ritsumeikan University, a specialist in information systems, estimates that it would take about four years and hundreds of billions of yen to do just that.

> Let’s send ‘em a bill. ;-)

I rather imagine the professor has a point.  Yeah, code that uses tzdb
would be easy to update.  But Japan is likely chock-full of locally
grown code that has never had to cope with any situation other than
"JST = UTC+9", and probably hasn't got any generality whatsoever
about its timestamp handling.

			regards, tom lane

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