michael.k...@gmx.at schrieb am Donnerstag, 24. April 2025 um 11:41:39 UTC+2:
But anyway, I also wonder what is really the issue. It may or may not be
just the label. depending on how the day_delta sum is calculated. Is it the
sum of the archive_day sums? Is it the sum of archive's rain column, over
30 x 24h?
May be, it is a matter of rounding. If the time period is 29 days and 23
hours, it is almost 30 days, but if you omit rounding it is 29 days.
Internally all timestamps are seconds since 1970-01-01 00:00:00 UTC. To get
a timespan of days WeeWX uses the functions
weeutil.archive{Day,Week,Month,Year}Span(), which convert the value into a
tuple of year, month, day, hour, minute, second local time, sets hour,
minute, second to 0, applies the appropriate amount of days, and finally
converts both ends back to seconds since 1970-01-01 00:00:00 UTC. If the
timespan includes a daylight saving time switch, it is - in seconds - not
whole days but an hour more or less.
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