julian(x, ...) ## S3 method for class 'Date': julian(x, origin = as.Date("1970-01-01"), ...) ## S3 method for class 'POSIXt': julian(x, origin = as.POSIXct("1970-01-01", tz = "GMT"), ...)months(x, abbreviate) ## S3 method for class 'Date': months(x, abbreviate = FALSE) ## S3 method for class 'POSIXt': months(x, abbreviate = FALSE)
quarters(x, abbreviate) ## S3 method for class 'Date': quarters(x, ...) ## S3 method for class 'POSIXt': quarters(x, ...)
weekdays(x, abbreviate) ## S3 method for class 'Date': weekdays(x, abbreviate = FALSE) ## S3 method for class 'POSIXt': weekdays(x, abbreviate = FALSE)
x | a Date or POSIXt object. |
origin | a Date or POSIXt object specifying the origin of the julian time. |
abbreviate | a logical value specifying if the return value should be abbreviated. |
... | additional arguments. |
julian | returns the number of days since the time origin, as a numeric vector for julian.Date and as a difftime object for julian.POSIXt, with an attribute origin. |
months, quarters, weekdays | returns a character vector denoting the months, quarters, or weekdays of the time objects specified. |
(dt <- as.Date(c("1970-01-01", "2038-01-19"))) format(dt, "%a %b %d %H:%M:%S %Y") julian(dt) months(dt, abbreviate = TRUE) quarters(dt) weekdays(dt, abbreviate = TRUE)pct <- as.POSIXct(c("1970-01-01 00:00:00", "2038-01-19 03:14:07"), tz = "GMT") julian(pct) plt <- as.POSIXlt(c("1970-01-01 00:00:00", "2038-01-19 03:14:07"), tz = "") julian(plt, origin = as.POSIXlt("1970-01-01", tz = ""))