Citing issue #436 <https://github.com/weewx/weewx/issues/436>
"What is 30 March minus one month? By this solution, it should be 28 Feb.
So then what is 29 March minus one month? Also 28 Feb? And so would 28
March minus a month. So, "one month earlier" for three days in a row leads
to the same date. That doesn't seem right."
That's how the Java People do it:
import java.time.*;
import java.time.*;
public class Leaps {
public static void main(String[] args)
{
LocalDate march29_23 = LocalDate.parse("2023-03-29");
LocalDate march30_23 = LocalDate.parse("2023-03-30");
LocalDate march31_23 = LocalDate.parse("2023-03-31");
LocalDate march29_24 = LocalDate.parse("2024-03-29");
LocalDate march30_24 = LocalDate.parse("2024-03-30");
LocalDate march31_24 = LocalDate.parse("2024-03-31");
System.out.printf("%s minus one month: %s%n", march29_23,
march29_23.minusMonths(1));
System.out.printf("%s minus one month: %s%n", march30_23,
march30_23.minusMonths(1));
System.out.printf("%s minus one month: %s%n", march31_23,
march31_23.minusMonths(1));
System.out.printf("%s minus one month: %s%n", march29_24,
march29_24.minusMonths(1));
System.out.printf("%s minus one month: %s%n", march30_24,
march30_24.minusMonths(1));
System.out.printf("%s minus one month: %s%n", march31_24,
march31_24.minusMonths(1));
}
}
Output:
2023-03-29 minus one month: 2023-02-28
2023-03-30 minus one month: 2023-02-28
2023-03-31 minus one month: 2023-02-28
2024-03-29 minus one month: 2024-02-29
2024-03-30 minus one month: 2024-02-29
2024-03-31 minus one month: 2024-02-29
So, they claim it is right, what doesn't seem right for you.
Tom Keffer schrieb am Donnerstag, 29. Februar 2024 um 21:03:55 UTC+1:
> I am not surprised that $year_delta=1 does not work on leap day. There is
> no 29 February 2023.
>
> This is issue #436 <https://github.com/weewx/weewx/issues/436>.
>
>
> On Thu, Feb 29, 2024 at 9:45 AM František Slimařík <[email protected]>
> wrote:
>
>> Hi Tom,
>>
>> actually I found another for cycle which caused the issue. When I changed
>> delta from "$year_delta=1" into "$day_delta=365" it works again.
>> Interesting it worked without any issue till yesterday :)
>>
>> ##for $A in $span($year_delta=1).months
>> $A.dateTime.format("%OB %Y");$A.rain.sum.format(add_label=False)
>> #end for
>>
>>
>> čt 29. 2. 2024 v 15:49 odesílatel Tom Keffer <[email protected]> napsal:
>>
>>> I just tried this and it worked fine:
>>>
>>> 28. February 2023;33.4
>>> 1. March 2023;36.1
>>> 2. March 2023;38.0
>>> 3. March 2023;37.1
>>> ...
>>> 26. February 2024;37.3
>>> 27. February 2024;38.5
>>> 28. February 2024;41.3
>>>
>>>
>>> On Wed, Feb 28, 2024 at 8:57 PM František Slimařík <[email protected]>
>>> wrote:
>>>
>>>> Yes, right
>>>>
>>>> #for $i in $span($day_delta=365).days
>>>> #set fDate = $i.dateTime.format("%-d. %B %Y")
>>>> $fDate;$i.outTemp.avg.format(add_label=False)
>>>> #end for
>>>>
>>>> čt 29. 2. 2024 v 1:49 odesílatel Tom Keffer <[email protected]> napsal:
>>>>
>>>>> I don't know. How are you using the $span() tags? In a loop, I assume?
>>>>>
>>>>> On Wed, Feb 28, 2024 at 3:25 PM František Slimařík <[email protected]>
>>>>> wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> is it possible that leap year causes issue in span tag? I am using
>>>>>> these:
>>>>>>
>>>>>> $span($day_delta=365).days
>>>>>> $span($year_delta=1).months
>>>>>>
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: Evaluation of template
>>>>>> /etc/weewx/skins/neowx/year.html.tmpl failed with exception '<class
>>>>>> 'ValueError'>'
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** Ignoring template
>>>>>> /etc/weewx/skins/neowx/year.html.tmpl
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** Reason: day is out of range for month
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** Traceback (most recent call last):
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** File
>>>>>> "/usr/share/weewx/weewx/cheetahgenerator.py", line 334, in generate
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** unicode_string =
>>>>>> compiled_template.respond()
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** File
>>>>>> "_etc_weewx_skins_neowx_year_html_tmpl.py", line 1380, in respond
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** File "/usr/share/weewx/weewx/tags.py",
>>>>>> line
>>>>>> 132, in span
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** year_delta=year_delta,
>>>>>> boundary=boundary),
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** File
>>>>>> "/usr/share/weewx/weeutil/weeutil.py",
>>>>>> line 402, in archiveSpanSpan
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** start_dt = time_dt.replace(year=year,
>>>>>> month=month)
>>>>>> Feb 29 00:10:43 rocky-weather-machine weewxd[405028]: ERROR
>>>>>> weewx.cheetahgenerator: **** ValueError: day is out of range for month
>>>>>>
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