posixct

问题 Reproducible code: # Loading quantmod library(quantmod) # Please, put in R this structure a <- structure(c(2.4, 2.35, 2.44, 2.44, 2.31, 2.32, 2.41, 2.43, 2.46, 2.42, 2.45, 2.39, 2.3, 2.41, 2.33, 2.37, 2.38, 2.4, 2.275, 2.235, -0.0300000000000002, -0.0499999999999998, 0.0899999999999999, 0, -0.13, 0.00999999999999979, 0.0900000000000003, 0.02, 0.0299999999999998, -0.04, 0.0300000000000002, -0.0600000000000001, -0.0900000000000003, 0.11, -0.0800000000000001, 0.04, 0.00999999999999979, 0.02, -0

问题 I'm using as.POSIXct to parse times with timezones, like this: as.POSIXct("2009-01-05 14:19 +1200", format="%Y-%m-%d %H:%M %z") However, if the string includes the timezone information +1300 , the function returns NA : > as.POSIXct("2009-01-05 14:19 +1300", format="%Y-%m-%d %H:%M %z") [1] NA Aparently +1300 is a valid timezone (NZDT – New Zealand Daylight Time). How to convince R to parse it? 回答1: This was a bug in 3.0.2 release, which was fixed in R-3.1.0 Patched build. 来源： https:/

问题 i have a variable that contains values about " the beginning of time interval expressed as the number of millisecond elapsed from the Unix Epoch on January 1st, 1970 at UTC." (according to data source metadata) This is the head: x$timeInt [1] 1.388068e+12 1.388075e+12 1.388096e+12 1.388051e+12 1.388051e+12 1.388072e+12 So i try to convert it as POSIXct as.POSIXct(x$timeInt, origin = '01-01-1970',tz='UTC') but i get this result [1] "43987-03-01 05:20:00 UTC" "43987-05-23 13:20:00 UTC" "43988

问题 How do I write this code ( hour is from lubridate package)? Objective: if hour part of PICK_DATE is later than 16:00, the ADJ_PICK_DATE should be next day 03:00. If the hour part of PICK_DATE is earlier than 03:00, then ADJ_PICK_DATE is to be same day 03:00. Problem is, when there is no change needed, the code still adds 3 hours to the PICK_DATE i.e. when the hour part of PICK_DATE is within 03:00 and 16:00. x$PICK_TIME <- cut(hour(x$PICK_DATE), c(-1, 2, 15, 24), c("EARLY", "OKAY", "LATE")) x

问题 I'm trying to convert a string to POSIXct in R v3.1.1 on Mac OS X Mavericks (10.9.4). This worked before upgrading Mavericks then R. My very simple code is now giving a warning and I don't understand why :- as.POSIXct("2014-05-24 12:45", "%Y-%m-%d %hh:%mm") [1] "2014-05-24 12:45:00 GMT" Warning messages: 1: In strptime(xx, f <- "%Y-%m-%d %H:%M:%OS", tz = tz) : unknown timezone '%Y-%m-%d %hh:%mm' 2: In as.POSIXct.POSIXlt(x) : unknown timezone '%Y-%m-%d %hh:%mm' 3: In strptime(xx, f <- "%Y/%m/

问题 I have a small training set of data that I am beginning to analyze. The dataset is comprised of hospital procedural codes, values for said procedure, and a date/time stamp. I am attempting to break down the time stamps into 'time of day' categories, as some of the procedural values will vary depending on morning/evening. I have tried using cut() , but I can't seem to figure out how to input specific time intervals for the categories (ex. 00:00 to 06:00 = "Fasting", 06:01- 10:00 = "Morning

问题 I'm trying to calculate the time difference between a row and a row that has a column that meets some criteria. Reading in some data: my_data <- data.frame(criteria = c("some text", "some more text", " ", " ", "more text", " "), timestamp = as.POSIXct(c("2015-07-30 15:53:15", "2015-07-30 15:53:47", "2015-07-30 15:54:48", "2015-07-30 15:55:48", "2015-07-30 15:56:48", "2015-07-30 15:57:49"))) criteria timestamp 1 some text 2015-07-30 15:53:15 2 some more text 2015-07-30 15:53:47 3 2015-07-30 15

问题 I have a problem in generating proper time sequence using R: fivemin <- seq(as.POSIXct("2014/01/01 0:00:00"), as.POSIXct("2014/04/01 0:00:00"), by="5 mins",tz="EST") time <- data.frame(MasterTime=fivemin) Using above code, I can get a data frame with 25909 observations. However, under Eastern Standard Time (without daylight saving), the number of observations should be 25920. The difference is 1 hour from the transition of daylight saving time on 03/09/20014, because then the time would

问题 I have a long series of POSIXct timestamps. I would like to return, for each record a day part, including day of the week. For example: [1] Sunday night [2] Sunday night [3] Sunday afternoon [4] Saturday night [5] Sunday afternoon ... and so on. Below is a small sample of the data: my_dates <- as.POSIXct(c("2000-03-12 19:40:00 AEDT", "2000-03-19 17:40:00 AEDT", "2000-03-26 14:10:00 AEST", "2000-04-01 19:40:00 AEST", "2000-04-09 14:10:00 AEST", "2000-04-16 14:40:00 AEST", "2000-04-22 19:40:00

问题 I know this has been asked several times and I looked at the questions and followed the suggestions. However, I couldn't solve this one. The datetime.csv can be found on https://www.dropbox.com/s/6bvhk4kei4pg8zq/datetime.csv My code looks like: jd1 <- read.csv("datetime.csv") head(jd1) Date Time 1 20100101 0:00 2 20100101 1:00 3 20100101 2:00 4 20100101 3:00 5 20100101 4:00 6 20100101 5:00 sapply(jd1,class) > sapply(jd1,class) Date Time "integer" "factor" jd1 <- transform(jd1, timestamp