[R] Locating data source error in large file

[Rich Shepard]

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