| as.date {survival} | R Documentation |
Converts any of the following character forms to a Julian date: 8/31/56, 8-31-1956, 31 8 56, 083156, 31Aug56, or August 31 1956.
as.date(x, order = "mdy", ...)
x |
input data vector. |
order |
if x is character, defines the order in which the terms are assumed to appear in a xx/xx/xx date. The default is month/day/year; any permutation of mdy is legal. |
... |
if x is character, then any other arguments from
mdy.date() can be used as well. |
If x is numeric, then floor(x) is returned, e.g.,
as.date(35) is the same as as.date(35.2) and gives
Feb 2, 1960. If x is character, the program attempts
to parse it.
For each date, the number of days between it and January 1, 1960. The date will be missing if the string is not interpretable.
mdy.date,
date.mmddyy,
date.ddmmmyy
as.date(c("1jan1960", "2jan1960", "31mar1960", "30jul1960"))