[R] Strange result for strptime with %p

[peter dalgaard]

Nice catch, Petr:

> strptime("05/01/18 00:59:59 AM", format = ("%m/%d/%y %I:%M:%S %p"), tz="Asia/Jayapura")
[1] NA
> strptime("05/01/18 12:59:59 AM", format = ("%m/%d/%y %I:%M:%S %p"), tz="Asia/Jayapura")
[1] "2018-05-01 00:59:59 WIT"

-pd

> On 2 Oct 2018, at 15:39 , PIKAL Petr <petr.pikal using precheza.cz> wrote:
> 
> Hi
> 
> Maybe it is connected to
> %I
> Hours as decimal number (01–12).
> 
> Your input has hour as 00
> 
> Cheers
> Petr
> 
>> -----Original Message-----
>> From: R-help <r-help-bounces using r-project.org> On Behalf Of Marc Girondot via
>> R-help
>> Sent: Tuesday, October 2, 2018 3:30 PM
>> To: R-help Mailing List <r-help using r-project.org>
>> Subject: [R] Strange result for strptime with %p
>> 
>> Dear members... are these results normal ?
>> 
>> For the first one, no problem. I expected this:
>> 
>>> strptime("05/01/18 01:00:00 AM", format = ("%m/%d/%y %I:%M:%S %p"),
>> tz="Asia/Jayapura")
>> [1] "2018-05-01 01:00:00 WIT"
>> 
>> For this one, it is ok also:
>> 
>>> strptime("05/01/18 01:00:00 AM", format = ("%m/%d/%y %I:%M:%S %p"),
>> tz="Asia/Jayapura")-1
>> [1] "2018-05-01 00:59:59 WIT"
>> 
>> But how to explain this ???
>> 
>>> strptime("05/01/18 00:59:59 AM", format = ("%m/%d/%y %I:%M:%S %p"),
>> tz="Asia/Jayapura")
>> [1] NA
>> 
>> Thanks for your advices
>> Marc
>> ______________________
>> 
>> R 3.5.1 on MacOS 10.14
>> 
>>> version
>>                _
>> platform       x86_64-apple-darwin15.6.0
>> arch           x86_64
>> os             darwin15.6.0
>> system         x86_64, darwin15.6.0
>> status
>> major          3
>> minor          5.1
>> year           2018
>> month          07
>> day            02
>> svn rev        74947
>> language       R
>> version.string R version 3.5.1 (2018-07-02)
>> nickname       Feather Spray
>> 
>> ______________________________________________
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes using cbs.dk  Priv: PDalgd using gmail.com