Re: [R] strptime, date and conversion of week number into POSIX

ges ; R mailing list project.org>; Bert Gunter > Subject: Re: [R] strptime, date and conversion of week number into POSIX > > Thanks Uwe and Bert, > I got the essential now, and can manage. Date handling stays quite a > challenge with a variable number of weeks in a year, but

Re: [R] strptime, date and conversion of week number into POSIX

That monday does not exist. FOr the week before: strptime(paste0("2020-52","-1"),format="%Y-%W-%u") [1] "2020-12-28" One week later is no longer in 2020, so there is no 53th week. Best, Uwe Ligges On 22.02.2021 16:15, Patrick Giraudoux wrote: Sorry to answer to myself, but the format was

Re: [R] strptime, date and conversion of week number into POSIX

Thanks Uwe and  Bert, I got the essential now, and can manage. Date handling stays quite a challenge with a variable number of weeks in a year, but I can understand why. Means eye-control (or NA detection) of strptime conversion stays necessary... Best, Patrick Le 22/02/2021 à 17:09, Uwe Ligge

Re: [R] strptime, date and conversion of week number into POSIX

I think the relevant info from ?strptime is: "For strptime the input string need not specify the date completely: it is assumed that unspecified seconds, minutes or hours are zero, and an unspecified year, month or day is the current one. (However, if a month is specified, the day of that month ha

Re: [R] strptime, date and conversion of week number into POSIX

Sorry to answer to myself, but the format was clearly incorrect in the previous post. It should read, refering to the 1th day of the week: strptime(paste0(mydate,"-1"),format="%Y-%W-%u") It converts better, but with a NA on week 53 > strptime(paste0(pays$year_week,"-1"),format="%Y-%W-%u") [1]