csv: convert datetimes with time zones to local date, mostly (WIP) #1583
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simonmichael
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Abandoned for now, because in a non-UTC timezone, dates with no time/timezone all get adjusted (they are assumed to be 00:00:00 UTC).
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Just sharing this.. it's an attempt to fix this CSV limitation I just noticed, dates from other timezones can be off by one:
fc364cd origin/master ;doc: csv: note a limitation with datetimes in other zones
I have abandoned it for now, because (in a non-UTC timezone) dates with no time/timezone all get adjusted, as they are parsed as 00:00:00 UTC. Perhaps with a bit more work this could be useful (somehow use local timezone as the default when parsing ? Convert to local date only when timezone-related strptime codes (%z, %ez, %Z, %eZ) appear in date-format ?
Related: haskell/time#172.
This PR doesn't handle the daylight-savings inaccuracy mentioned there, but I think it would still improve the date in most cases (off by one errors would still be possible, but rather rare for most people). Adding the<- a mistake ? Hopefully.tzpackage as a dependency could allow "perfect" accuracy, but only for past dates, as far as I understand it.