On Fri, 20 Jul 2018, David Winsemius wrote: > wy2016$dt_time <- with( wy2016, as.POSIXct( paste( date, time ) , format= > "%Y-%m-%d %H:%M") ) David/Bill/Eric: Thank you all. I found the typos which covered a single day toward the end of the dataframe. Carpe weekend, Rich