[R] Locating data source error in large file

William Dunlap
Fri, 20 Jul 2018 19:59:40 -0000

Which format did you use when you used is.na on the output of
   as.POSIXlt(strings, format=someFormat)
and found none?  Did the resulting dates look OK?  Perhaps
all is well.

Note the the common American format month/day/year is not
one that is tested when you don't supply a format - xx/yy/zzzz
is treated as year/month/day (and it changes the time zone,
presumable because US/Pacific time was not used in the year
10 CE).
  > as.POSIXlt("10/7/1962")
  [1] "0010-07-19 LMT"
  > as.POSIXlt("3/17/1962")
  Error in as.POSIXlt.character("3/17/1962") :
    character string is not in a standard unambiguous format


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Fri, Jul 20, 2018 at 11:58 AM, Rich Shepard <rshepard at
appl-ecosys.com>
wrote:

> On Fri, 20 Jul 2018, William Dunlap wrote:
>
> The problem occurs because no commonly used format works on all your date
>> strings. If you give as.POSIXlt the format you want to use then items
that
>> don't match the format will be treated as NA's. Use is.na() to
find them.
>>
>
> Bill,
>
>   No NAs found using both is.na() and scrolling through the source file.
> That's why I asked for help: I saw nothing different in the dates or
times.
>
> Regards,
>
>
> Rich
>
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