[R] time series problem

[Tomas Mikoviny]

Hi everybody,

I work with data with following pattern

 > comm

	"Date"		"Value"
1	4/10/2007	361.2
2	4/11/2007	370.1
3	4/12/2007	357.2
4	4/13/2007	362.3
5	4/16/2007	363.5
6	4/17/2007	368.7
7	4/18/2007	354.7
8	4/19/2007	368.8
9	4/20/2007	367.1
10	...			...

and trying to convert it to time series using:

 > t=strptime(comm[1,1],"%m/%d/%Y")
 > x=ts(comm, start=as.POSIXct(t))

Error in Math.difftime((end - start) * frequency + 1.01) :
	floornot defined for "difftime" objects

Definitely I do something wrong but I can't find what is it!
Can anyone help me with this?

Thanks.

Tomas