parse_date_time
Function to parse character and numeric date-time vectors with user friendly order formats.
As compared to strptime parser,
parse_date_time allows to specify only the order
in which the formats occur instead of the full format.
As it was specifically designed to handle heterogeneous
date-time formats at once, you can specify several
alternative orders. parse_date_time sorts the
supplied formats based on a training set and then applies
them recursively on the input vector.
- Keywords
- chron
Usage
parse_date_time(x, orders, tz = "UTC", truncated = 0,
quiet = FALSE, locale = Sys.getlocale("LC_TIME"),
select_formats = .select_formats)Arguments
- x
- a character or numeric vector of dates
- orders
- a character vector of date-time formats.
Each order string is series of formatting characters as
listed
strptimebut might not include the "%" prefix, for example "ymd" will match all the possi - tz
- a character string that specifies the time zone with which to parse the dates
- truncated
- integer, number of formats that can be
missing. The most common type of irregularity in
date-time data is the truncation due to rounding or
unavailability of the time stamp. If
truncatedparameter is non-zeroparse_date_time - quiet
- logical. When TRUE function evaluates without displaying customary messages.
- locale
- locale to be used, see locales. On
linux systems you can use
system("locale -a")to list all the installed locales. - select_formats
- A function to select actual formats
for parsing from a set of formats which matched a
training subset of
x. This should be function receiving a named integer vector and returning a character vector of selected formats. Names of the in
Details
Below are all the implemented formats recognized by
lubridate. For all numeric formats leading 0s are
optional. All formats are case insensitive. As compared
to strptime, some of the formats have been
extended for efficiency reasons. They are marked with "*"
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Value
- a vector of POSIXct date-time objects
See Also
Examples
x <- c("09-01-01", "09-01-02", "09-01-03")
parse_date_time(x, "ymd")
parse_date_time(x, "%y%m%d")
parse_date_time(x, "%y %m %d")
# "2009-01-01 UTC" "2009-01-02 UTC" "2009-01-03 UTC"
## ** heterogenuous formats **
x <- c("09-01-01", "090102", "09-01 03", "09-01-03 12:02")
parse_date_time(x, c("%y%m%d", "%y%m%d %H%M"))
## different ymd orders:
x <- c("2009-01-01", "02022010", "02-02-2010")
parse_date_time(x, c("%d%m%Y", "ymd"))
## "2009-01-01 UTC" "2010-02-02 UTC" "2010-02-02 UTC"
## ** truncated time-dates **
x <- c("2011-12-31 12:59:59", "2010-01-01 12:11", "2010-01-01 12", "2010-01-01")
parse_date_time(x, "%Y%m%d %H%M%S", truncated = 3)
parse_date_time(x, "ymd_hms", truncated = 3)
## "2011-12-31 12:59:59 UTC" "2010-01-01 12:11:00 UTC" "2010-01-01 12:00:00 UTC" "2010-01-01 00:00:00 UTC"