add one second to the specific times in r -

could please tell me how add single second datetimes ended __:59?

i.e. this:

              datetime rain_mm 1  2012-12-01 00:00:00     1.0 2  2012-12-01 00:06:00     0.0 3  2012-12-01 00:11:59     0.0 4  2012-12-01 00:17:59     0.0 5  2012-12-01 00:24:00     0.2 6  2012-12-01 00:30:00     0.0 7  2012-12-01 00:36:00     1.0 8  2012-12-01 00:42:00     0.0 9  2012-12-01 00:48:00     0.8 10 2012-12-01 00:53:59     0.2 

to:

              datetime rain_mm 1  2012-12-01 00:00:00     1.0 2  2012-12-01 00:06:00     0.0 3  2012-12-01 00:12:00     0.0 4  2012-12-01 00:18:00     0.0 5  2012-12-01 00:24:00     0.2 6  2012-12-01 00:30:00     0.0 7  2012-12-01 00:36:00     1.0 8  2012-12-01 00:42:00     0.0 9  2012-12-01 00:48:00     0.8 10 2012-12-01 00:54:00     0.2 

any please? thank in advance

you can check as.integer(format(x, "%s") == "59") when converted integer become either 1 or 0 can conveniently add x since posixct measure of seconds (typically 1970-01-01:00:00:00 or, in cases, arbitrary origin).

x = structure(c(1354342319, 1354343040), class = c("posixct", "posixt"), tzone = "") x #[1] "2012-12-01 00:11:59 cst" "2012-12-01 00:24:00 cst" x + as.integer(format(x, "%s") == "59") #[1] "2012-12-01 00:12:00 cst" "2012-12-01 00:24:00 cst"