Hi Jim,
I got an error
> df$Date2<-
+ as.POSIXct(as.character(df$Date1, format = "%m/%d/%Y %H:%M:%S"))
Error in as.POSIXlt.character(x, tz, ...) :
character string is not in a standard unambiguous format
On Sun, Feb 2, 2014 at 9:08 PM, Jim Lemon <j...@bitwrit.com.au> wrote:
> On 02/03/2014 12:53 PM, Yolande Tra wrote:
>
>> Hi,
>>
>> I have the following issue. The dataframe df has a column (Date1)
>> supposed
>> to be a date but read as a factor. There are two types of values in the
>> same column Date1
>> Type 1 are datetime like "5/23/2008 0:00:00"
>> Type 2 have no time like "1/10/13".
>>
>> When I apply the following to the date column
>> df$Date1<-as.POSIXct(as.character(df$Date1, format = "%d/%m/%Y"))
>>
>> For type 1 I got the expected result: "2008-05-23"
>> For type 2 I got NA.
>>
>> I have searched but could not solve it. Please help.
>>
>> Hi Yolande,
> Try this:
>
> # first get the dates with times
> df$Date1<-
> as.POSIXct(as.character(df$Date1, format = "%m/%d/%Y %H:%M:%S"))
> # then fill in the ones without times
> df$Date1[nchar(df$Date1) < 10]<-
> as.POSIXct(as.character(df$Date1, format = "%m/%d/%y"))
>
> Notice that I think you got the month/day order wrong, if your first type
> is correct.
>
> Jim
>
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