ssDate Objects
The function ssDate is used to create ssDate
(spreadsheet date) objects, which are useful for reading and writing
dates in spreadsheet form, i.e., as the number of days since December
30, 1899.
as.ssDate and is.ssDate coerce an object to a ssDate and
test whether an object is a ssDate.
ssDate(x, ...) as.ssDate(x) is.ssDate(x)
x |
object to be tested ( |
... |
other args to be passed to |
an ssDate is essentially a rebased Julian date that represents
a date as the number of days since December 30, 1899. The
constructor function ssDate subtracts jul(18991230) from
jul(x, ...) and coerces the result to class ssDate.
Pretty much all of the stuff you can do with jul objects can
also be done with ssDate objects.
is.ssDate returns TRUE or FALSE.
as.ssDate coerces its argument to have class ssDate, without
making any attempt to discern whether or not this is a sensible thing
to do.
ssDate constructs a ssDate object like x.
ssDate with no arguments returns the ssDate for the current day.
dec31 <- ssDate(20041231)
jan30 <- ssDate("2005-1-30")
jan30 - dec31 ## 30
feb28 <- jan30 + 29
ssDate() ## current datePlease choose more modern alternatives, such as Google Chrome or Mozilla Firefox.