[Datetime-SIG] DST explained visually
alexander.belopolsky at gmail.com
Wed Aug 26 22:06:50 CEST 2015
On Wed, Aug 26, 2015 at 3:00 PM, Guido van Rossum <guido at python.org> wrote:
> Note that the current text of the PEP has a flag named 'first' whose
definition is the opposite; but the plan is to switch to fold=0.
I decided to establish the origin of the term "fold" before editing the
PEP. The credit for introducing the term "fall-backward fold" in computing
goes to Paul Eggert of UCLA who used it in various discussions related to
the C language standard that culminated in a defect report #139 .
However, apparently, the idea goes back to 1917 Germany. As Paul Eggert
explained in private correspondence,
fold=0 and fold=1 is like the longstanding German standard for expressing
times as strings, which uses "A" and "B" to distinguish time stamps that
would otherwise be ambiguous. If I understand things correctly, normally
fold=0, but you can have fold=1 when time stamps are repeated. For more
about the German standard, you can start with the Wikipedia description
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