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 <rshep...@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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