Currently fread colClasses does not support conversion to POSIXct:
str(data.table::fread("c1,c2\n2018-01-31 03:16:57,b", colClasses=c(c1="POSIXct")))
#Classes 'data.table' and 'data.frame': 1 obs. of 2 variables:
# $ c1: chr "2018-01-31 03:16:57"
# $ c2: chr "b"
# - attr(*, ".internal.selfref")=<externalptr> related to #1450
once solved update: https://stackoverflow.com/questions/41903259/data-table-colclasses-conversion-to-posixct
Currently fread colClasses does not support conversion to POSIXct:
related to #1450
once solved update: https://stackoverflow.com/questions/41903259/data-table-colclasses-conversion-to-posixct