Re: [Datetime-SIG] DST explained visually
[Alexander]
I have edited [1] your sketch to show the UTC mappings of two local times: g in the gap and f in the fold: (g, fold=0) maps to G0, (g, fold=1) maps to G1, (f, fold=0) maps to F0, and (f, fold=1) maps to F1. Note that G1 < G0 while F1 > F0. This may look arbitrary, but it follows from a consistent rule: fold=0 is the intersection with the line that is solid (valid) before the transition and fold=1 is the intersection with the line that is solid (valid) after the transition.
[1]: https://github.com/abalkin/ltdf/blob/master/dst-visual.jpg
So we're switching to a boolean flag again, named solidbefore? The great advantage to that would be easy of finding via Google. While there a hundred times more hits on "python which" than on "python fold", there are still over 800,000 hits on the latter. There only 7 on python "solidbefore" although you need the quotes to cut it back from some thousands ;-)
participants (1)
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Tim Peters