Parse ISO 8601 Date/Time Strings
Extract date/time components from strings following one of the six formats specified in the NOTE-datetime ISO 8601 profile (https://www.w3.org/TR/NOTE-datetime).
x |
a character vector. |
For character strings in one of the formats in the profile, the corresponding date/time components are extracted, with seconds and decimal fractions of seconds combined. Other (malformed) strings are warned about.
The extracted components for each string are gathered into a named list with elements of the appropriate type (integer for year to min; double for sec; character for the time zone designator). The object returned is a (suitably classed) list of such named lists. This internal representation may change in future versions.
One can subscript such ISO 8601 date/time objects using [ and
extract components using $ (where missing components will
result in NAs), and convert them to the standard R date/time
classes using as.Date(), as.POSIXct() and
as.POSIXlt() (incomplete elements will convert to
suitably missing elements). In addition, there are print() and
as.data.frame() methods for such objects.
An object inheriting from class "ISO_8601_datetime" with the
extracted date/time components.
## Use the examples from <https://www.w3.org/TR/NOTE-datetime>, plus one
## in UTC.
x <- c("1997",
"1997-07",
"1997-07-16",
"1997-07-16T19:20+01:00",
"1997-07-16T19:20:30+01:00",
"1997-07-16T19:20:30.45+01:00",
"1997-07-16T19:20:30.45Z")
y <- parse_ISO_8601_datetime(x)
y
## Conversions: note that "incomplete" elements are converted to
## "missing".
as.Date(y)
as.POSIXlt(y)
## Subscripting and extracting components:
head(y, 3)
y$monPlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.