Dates not working in exec/arg_test.R

[jeremystan]

[jeremystanley:~/src/args/exec]$ ./arg_test.R --zones 1 3 27                             (master)
Loading required package: methods

Attaching package: ‘lubridate’

The following object is masked from ‘package:base’:

    date

Error in as.Date.numeric(actuals[[i]]) : 'origin' must be supplied
Calls: init_args -> <Anonymous> -> as.Date.numeric
In addition: Warning message:
In do.call("..f", c(list(x), defaults)) : NAs introduced by coercion
Execution halted