convert date to unix time in R

Question

I want to convert \"2013-09-16\" into unix time.

I found Convert UNIX epoch to Date object in R but I need to do the reverse of that.

Thanks!

Answer 1

Simply cast to numeric:

as.numeric(as.POSIXct("2013-09-06", format="%Y-%m-%d"))
# [1] 1378418400

Answer 2

Quite simple:

as.numeric(as.POSIXct("2013-09-16 2:13:46 EST"))