posixct

I have a .csv file with one field each for datetime, date and time. Originally they are all character fields and I have converted them accordingly. At the end of my code, if I do: str(data) I will get datetime: POSIXct date: Date time: Class 'times' atomic [1:2820392] (....) attr(*, "format")= chr "h:m:s" Now, I am very happy with this and I want to create a .csv file, so this is what I have: write.csv(data, file = "data.csv", row.names = FALSE) I have also tried write.table(data, "data.csv", sep = ",", row.names = FALSE) And I get the same result with both, which is all my convertion gets

This question already has an answer here: Round a POSIX date and time (posixct) to a date relative to a timezone 1 answer I have data in the format time <- c("16:53", "10:57", "11:58") etc I would like to create a new column where each of these times is rounded to the nearest hour. I cannot seem to get the POSIX command to work for me. as.character(format(data2$time, "%H:%M")) Error in format.default(structure(as.character(x), names = names(x), dim = dim(x), : invalid 'trim' argument Let alone use the round command. Can anyone advise? ## Example times x <- c("16:53", "10:57", "11:58") ## POSIX

I am manipulating some POSIXlt DateTime objects. For example I would like to add an hour: my.lt = as.POSIXlt("2010-01-09 22:00:00") new.lt = my.lt + 3600 new.lt # [1] "2010-01-09 23:00:00 EST" class(new.lt) # [1] "POSIXct" "POSIXt" The thing is I want new.lt to be a POSIXlt object. I know I could use as.POSIXlt to convert it back to POSIXlt , but is there a more elegant and efficient way to achieve this? Short answer: No Long answer: POSIXct and POSIXlt objects are two specific types of the more general POSIXt class (not in a strictly object oriented inheritance sense, but in a quasi-object

Let's say we have this: ex <- c('2012-41') This represent the week 41 from the year 2012. How would I get the month from this? Since a week can be between two months, I will be interested to get the month when that week started (here October). Not duplicate to How to extract Month from date in R (do not have a standard date format like %Y-%m-%d). The following will add the week-of-year to an input of year-week formatted strings and return a vector of dates as character. The lubridate package weeks() function will add the dates corresponding to the end of the relevant week. Note for example I

I want to round a POSIXct down to the day, relative to a specific timezone. If I try round(as.POSIXct("2013-03-05 23:00:00 EST"), "day") It returns 2013-03-06 Which makes sense, in that when it's 23:00:00 EST on 2013-03-05 in EST5EDT, it's already 2013-03-06 in UTC. Logically, what I want to do is: round(as.POSIXct("2013-03-05 23:00:00 EST"), "day", tz="EST5EDT") That is, "round this date and time to the nearest day, relative to the EST5EDT time zone". Unfortunately, round doesn't take a time zone parameter. round will round to the next day once it's past midday, which is why I think you are