... or a timezone string. ... or do what I usually do and use POSIXct for dates as well as times, self-managing use of midnight local time for "dates".
On September 25, 2024 5:40:37 AM EDT, Ivan Krylov via R-help <r-help@r-project.org> wrote: >24 сентября 2024 г. 17:10:13 GMT+03:00, Luca Brinkmann via R-help ><r-help@r-project.org> пишет: >> My current >> understanding is, that a Date object does only save the days from the >> origin and no more information about timezones or other information >> (please correct me if I am wrong). > >You are correct. > > >> the date object is displayed in my RStudio environment as "2024-11-11 >> UTC". > >This looks like a result of as.POSIXlt(<Date object>). > >> In contrast, getting the timezone information with base::format will >> yield the timezone information >> > base::format(d, format="%Z") >> [1] "UTC" > >That's an implementation detail: the format() method for Date objects conjures >a temporary POSIXlt object and formats the result, and POSIXlt objects can >contain time zone information. > >> Is there any way to add timezone information to an Date >> object (other than UTC) and keeping it a Date object? > >Not with a plain 'Date'. What should a date in a timezone mean? Start of day? >End of day? The whole 24-hour interval (except when it lasts 23 or 25 hours >due to DST)? > >Perhaps you could store one (or two for an interval) POSIXt object(s) if you >need timezone information for your dates. > -- Sent from my phone. Please excuse my brevity. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
